研究者データベース

小林 一道(コバヤシ カズミチ)
工学研究院 機械・宇宙航空工学部門 熱流体システム
准教授

基本情報

所属

  • 工学研究院 機械・宇宙航空工学部門 熱流体システム

職名

  • 准教授

学位

  • 博士(工学)(北海道大学)

論文上での記載著者名

  • Kazumichi Kobayashi
  • K. Kobayashi
  • Kobayashi, K.

ホームページURL

J-Global ID

研究キーワード

  • 分子動力学   分子気体力学   液滴   気泡   界面相変化現象   分子流体力学   流体工学   

研究分野

  • ものづくり技術(機械・電気電子・化学工学) / 流体工学

職歴

  • 2013年04月 - 現在 北海道大学 工学研究院 准教授
  • 2015年04月 - 2015年09月 名古屋大学 大学院工学研究科 非常勤講師
  • 2010年04月 - 2013年03月 北海道大学 工学研究院 助教
  • 2007年04月 - 2010年03月 大阪府立大学 工学研究科 助教
  • 2006年04月 - 2007年03月 北海道大学 工学研究科 日本学術振興会特別研究員(DC2)

学歴

  • 2004年04月 - 2007年03月   北海道大学   大学院工学研究科   機械科学専攻 博士後期課程
  • 2002年04月 - 2004年03月   北海道大学   大学院工学研究科   機械科学専攻 修士課程
  • 1998年04月 - 2002年03月   北海道大学   工学部   機械工学科

所属学協会

  • 日本混相流学会   分子シミュレーション研究会   日本熱物性学会   日本流体力学会   日本物理学会   日本機械学会   

研究活動情報

論文

  • Kotaro Ohash, Kazumichi Kobayashi, Hiroyuki Fujii, Masao Watanabe
    Scientific Reports 10 8143  2020年05月 [査読有り][通常論文]
  • Hirofumi Tabe, Kazumichi Kobayashi, Hisao Yaguchi, Hiroyuki Fujii, Masao Watanabe
    International Journal of Thermal Science 150 106203  2020年04月 [査読有り][通常論文]
  • 遠藤 茂樹, 藤井 宏之, 小林 一道, 渡部 正夫
    Proceeding of the 7th Asian NIR symposium (ANS2020) 2020 NRT-0008 60 - 61 2020年02月 [査読有り][通常論文]
  • 藤井 宏之, 西村 吾朗, 遠藤 茂樹, 野村 航希, 小林 一道, 渡部 正夫
    Proceeding of the 7th Asian NIR symposium (ANS2020) 2020 AFI-0007 14 - 15 2020年02月 [査読有り][通常論文]
  • Hidden prompt splashing by corona splashing at drop impact on a smooth dry surface
    T. Ashida, M. Watanabe, K. Kobayashi, H. Fujii, T. Sanada
    Physical Review Fluids accepted for publication  2020年 [査読有り][通常論文]
  • Characteristic length and time scales of the highly forward scattering of photons in random media
    Hiroyuki Fujii, Moegi Ueno, Kazumichi Kobayashi, Masao Watanabe
    Applied Sciences 10 93  2020年 [査読有り][通常論文]
  • 藤井 宏之, 千葉 豪, 山田 幸生, 星 詳子, 小林 一道, 渡部 正夫
    Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19 SM05 261 - 268 2019年09月 [査読有り][通常論文]
  • 藤井 宏之, 山田 幸生, 星 詳子, 小林 一道, 渡部 正夫
    AIP Conference Proceedings (ICNAAM2018) 2116 450037 1 - 4 2019年07月 [査読有り][通常論文]
  • 田林 孝介, 藤井 宏之, 小林 一道, 渡部 正夫
    AIP Conference Proceedings (ICNAAM2018) 2116 450052 1 - 4 2019年07月 [査読有り][通常論文]
  • Kyohei Yamamoto, Kazumichi Kobayashi, Masao Watanabe, Hiroyuki Fujii, Misaki Kon, Hiroyuki Takahira
    Physical Review Fluids 4 6 063603  2019年06月 [査読有り][通常論文]
  • 田林 孝介, 藤井 宏之, 大川 晋平, 小林 一道, 山田 幸生, 星 詳子, 渡部 正夫
    CMBE Proceedings (6th International Conference on Computational & Mathematical Biomedical Engineering) A5 161 - 164 2019年05月 [査読有り][通常論文]
  • Hirofumi Tabe, Kazumichi Kobayashi, Hisao Yaguchi, Hiroyuki Fujii, Masao Watanabe
    Heat and Mass Transfer 55 4 993 - 1003 2019年04月 [査読有り][通常論文]
  • Correction to: Influence of liquid–solid intermolecular force on levitation of impacting nanodroplet
    Hirofumi Tabe, Kazumichi Kobayashi, Hisao Yaguchi, Hiroyuki Fujii, Masao Watanabe
    Heat and Mass Transfer 55 4 1005 - 1005 2019年04月 [査読有り][通常論文]
  • Molecular Dynamics Study on Influence of Liquid-solid Intermolecular Force on Levitating Mechanism of Impacting Nanodroplet on Heated Wall
    Hirofumi Tabe, Kazumichi Kobayashi, Hisao Yaguchi, Hiroyuki Fujii, Masao Watanabe
    Surface Wettability Effects on Phase Change Phenomena(SWEP) 2019年 [査読有り][通常論文]
  • Kazumichi Kobayashi, Takahiro Nagayama, Masao Watanabe, Hiroyuki Fujii, Misaki Kon
    Journal of Fluid Mechanics 856 1045 - 1063 2018年12月 [査読有り][通常論文]
  • Yuki Tatekura, Masao Watanabe, Kazumichi Kobayashi, Toshiyuki Sanada
    Royal Society Open Science 5  - 181101 2018年12月 [査読有り][通常論文]
  • Hiroyuki Fujii, YukioYamad, Go Chiba, Yoko Hoshi, Kazumichi Kobayashi, Masao Watanabea
    Journal of Computational Physics 2018年07月 [査読有り][通常論文]
  • Influence of surface roughness of high temperature wall on levitation of impacting droplet based on molecular dynamics simulation
    Hirofumi Tabe, Kazumichi Kobayashi, Hisao Yaguchi, Hiroyuki Fujii, Masao Watanabe
    Surface Wettability Effects on Phase Change Phenomena (SWEP) workshop 2018年 [査読有り][通常論文]
  • 世古和也, 小林一道, 藤井宏之, 渡部正夫
    混相流 32 1 59 - 64 2018年 [査読有り][招待有り]
  • H. Fujii, Y. Yamada, Y. Hoshi, S. Okawa, K. Kobayashi, M. Watanabe
    Reaction Kinetics, Mechanisms and Catalysis 2017年12月 [査読有り][通常論文]
  • Numerical investigation of light and pressure propagation in biological tissue for model-based photoacoustic tomography
    田林 孝介, 藤井 宏之, 小林 一道, 渡部 正夫
    Extended Abstracts of The 9th JSME-KSME Thermal and Fluids Engineering Conference TFEC9-1526 1 - 4 2017年10月 [査読有り][通常論文]
  • Misaki Kon, Kazumichi Kobayashi, Masao Watanabe
    EUROPEAN JOURNAL OF MECHANICS B-FLUIDS 64 81 - 92 2017年07月 [査読有り][招待有り]
     
    Heat and mass transfer caused by nonequilibrium phase change (net evaporation/condensation) play a major role in a vapor-liquid two-phase flow. In general, liquid temperature changes with time because of the heat and mass transfer between the vapor and liquid phases; however, a precise investigation of the transport phenomena related to this temporal evolution of liquid temperature is still lacking. The aim of this study is to examine a kinetic boundary condition, which depends on liquid temperature, for the Boltzmann equation in a vapor-liquid two-phase system with unsteady net evaporation/condensation. In this study, we confirmed whether the kinetic boundary condition follows the temporal evolution of liquid temperature attributed to unsteady net evaporation/condensation by using the molecular simulation based on mean-field kinetic theory, and then we validated the accuracy of the kinetic boundary condition by solving the initial boundary value problem of the Boltzmann equation in unsteady net evaporation/condensation. These results showed that the kinetic boundary condition follows the temporal evolution of liquid temperature in the simulation setting of this study. Furthermore, we concluded that the kinetic boundary condition that depends on liquid temperature is guaranteed to be accurate even in unsteady net evaporation/condensation by considering the temporal evolution of liquid temperature. (C) 2016 Elsevier Masson SAS. All rights reserved.
  • H. Fujii, Y. Yamada, K. Kobayashi, M. Watanabe, Y. Hoshi
    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 33 5 2017年05月 [査読有り][通常論文]
     
    Diffuse optical tomography using near-infrared light in a wavelength range from 700 to 1000nm has the potential to enable non-invasive diagnoses of thyroid cancers; some of which are difficult to detect by conventional methods such as ultrasound tomography. Diffuse optical tomography needs to be based on a physically accurate model of light propagation in the neck, because it reconstructs tomographic images of the optical properties in the human neck by inverse analysis. Our objective here was to investigate the effects of three factors on light propagation in the neck using the 2D time-dependent radiative transfer equation: (1) the presence of the trachea, (2) the refractive-index mismatch at the trachea-tissue interface, and (3) the effect of neck organs other than the trachea (spine, spinal cord, and blood vessels). There was a significant influence of reflection and refraction at the trachea-tissue interface on the light intensities in the region between the trachea and the front of the neck surface. Organs other than the trachea showed little effect on the light intensities measured at the front of the neck surface although these organs affected the light intensities locally. These results indicated the necessity of modeling the refractive-index mismatch at the trachea-tissue interface and the possibility of modeling other neck organs simply as a homogeneous medium when the source and detectors were far from large blood vessels.
  • Kazumichi Kobayashi, Kiyofumi Sasaki, Misaki Kon, Hiroyuki Fujii, Masao Watanabe
    MICROFLUIDICS AND NANOFLUIDICS 21 3 1 - 13 2017年03月 [査読有り][通常論文]
     
    Using molecular dynamics simulations, the present study investigated the precise characteristics of the binary mixture of condensable gas (vapor) and noncondensable gas (NC gas) molecules creating kinetic boundary conditions (KBCs) at a gas-liquid interface in equilibrium. We counted the molecules utilizing the improved two-boundary method proposed in previous studies by Kobayashi et al. (Heat Mass Trans 52: 1851-1859, 2016. doi: 10.1007/s00231-015-1700-6). In this study, we employed Ar for the vapor molecules, and Ne for the NC gas molecules. The present method allowed us to count easily the evaporating, condensing, degassing, dissolving, and reflecting molecules in order to investigate the detailed motion of the molecules, and also to evaluate the velocity distribution function of the KBCs at the interface. Our results showed that the evaporation and condensation coefficients for vapor and NC gas molecules decrease with the increase in the molar fraction of the NC gas molecules in the liquid. We also found that the KBCs can be specified as a function of the molar fraction and liquid temperature. Furthermore, we discussed the method to construct the KBCs of vapor and NC gas molecules.
  • Molecular Dynamics Study of Droplet Impact on High-Temperature Wall
    Hirofumi Tabe, Kazumichi Kobayashi, Hisao Yaguchi, Hiroyuki Fujii, Masao Watanabe
    The 7th East Asia Mechanical and Aerospace Engineering Workshop 2017年 [査読有り][通常論文]
  • Molecular Dynamics Simulation of the Role of the Wettability in the Droplet Impact on a High-temperature Wall
    Hirofumi Tabe, Kazumichi Kobayashi, Hisao Yaguchi, Hiroyuki Fujii, Masao Watanabe
    Extended Abstracts of the 9th JSME-KSME Thermal and Fluids Engineering Conference TFEC9-1492 2017年 [査読有り][通常論文]
  • Kazumichi Kobayashi, Kazumasa Hori, Misaki Kon, Kiyofumi Sasaki, Masao Watanabe
    HEAT AND MASS TRANSFER 52 9 1851 - 1859 2016年09月 [査読有り][通常論文]
     
    Using molecular dynamics simulations, the present study investigates the precise characteristics of evaporating and reflecting monatomic molecules (argon) composing a kinetic boundary condition (KBC) in a vapor-liquid equilibria. We counted the evaporating and reflecting molecules utilizing two boundaries (vapor and liquid boundaries) proposed by the previous studies (Meland et al. in Phys Fluids 16:223-243, 2004; Gu et al. in Fluid Phase Equilib 297:77-89, 2010). In the present study, we improved the method using the two boundaries incorporating the concept of the spontaneously evaporating molecular mass flux. The present method allows us to count the evaporating and reflecting molecules easily, to investigate the detail motion of the evaporating and reflecting molecules, and also to evaluate the velocity distribution function of the KBC at the vapor-liquid interface, appropriately. From the results, we confirm that the evaporating and reflecting molecules in the normal direction to the interface have slightly faster and significantly slower average velocities than that of the Maxwell distribution at the liquid temperature, respectively. Also, the stall time of the reflecting molecules at the interphase that is the region in the vicinity of the vapor-liquid interface is much shorter than those of the evaporating molecules. Furthermore, we discuss our method for constructing the KBC that incorporates condensation and evaporation coefficients. Based on these results, we suggest that the proposed method is appropriate for investigating KBC in various nonequilibrium states or multi-component systems.
  • Misaki Kon, Kazumichi Kobayashi, Masao Watanabe
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 99 317 - 326 2016年08月 [査読有り][通常論文]
     
    For the accurate description of heat and mass transfer through a vapor-liquid interface, the appropriate modeling of the interface during nonequilibrium phase change (net evaporation/condensation) is a crucial issue. The aim of this study is to propose a microscopic interfacial model which should be imposed at the interface as the kinetic boundary condition for the Boltzmann equation. In this study, we constructed the kinetic boundary condition for monoatomic molecules over a wide range of liquid temperature based on mean field kinetic theory, and we validated the accuracy of the constructed kinetic boundary condition by solving the boundary value problem of the Boltzmann equation. These results showed that we can impose the kinetic boundary condition at the interface by simply specifying liquid temperature and simulate the complex vapor-liquid two-phase flow induced by net evaporation/condensation. Furthermore, we applied the constructed kinetic boundary condition to the boundary condition for the fluid-dynamic type equations. This application enables us to deal with a large spatio-temporal scale of the interfacial dynamics in the vapor-liquid two-phase system with net evaporation/condensation. (C) 2016 Elsevier Ltd. All rights reserved.
  • Kazumichi Kobayashi, Kazuki Konno, Hisao Yaguchi, Hiroyuki Fujii, Toshiyuki Sanada, Masao Watanabe
    PHYSICS OF FLUIDS 28 3  - 032002 2016年03月 [査読有り][通常論文]
     
    In this study, we investigated nanodroplet spreading at the early stage after the impact using molecular dynamics simulations by changing the magnitude of the intermolecular force between the liquid and wall molecules. We showed that the droplet deformation after the impact greatly depends on the intermolecular force. The temporal evolution of the spreading diameters was measured by the cylindrical control volume for several molecular layers in the vicinity of the wall. At the early stage of the nanodroplet impact, the normalized spreading radius of the droplet is proportional to the square root of the normalized time, (t) over cap. This result is understood by the geometrical consideration presented by Rioboo et al. ["Time evolution of liquid drop impact onto solid, dry surfaces," Exp. Fluids 33, 112-124 (2002)]. In addition, we found that as the intermolecular force between the liquid and wall becomes stronger, the normalized spreading diameter of the first molecular layer on the wall remains less dependent on the impact velocity. Furthermore, the time evolution of the droplet spreading changes from root(t) over cap to log (t) over cap with time. (C) 2016 AIP Publishing LLC.
  • 今 美沙紀, 小林 一道, 佐々木 清文, 渡部 正夫
    混相流 29 493 - 500 2016年03月 [査読有り][招待有り]
  • 藤井 宏之, 西村 吾朗, 服部 聖仁, 小林 一道, 渡部 正夫
    Proceeding of the fifth Asian NIR symposium (ANS2016) 2016 P-86 288 - 289 2016年 [査読有り][通常論文]
  • 服部 聖仁, 藤井 宏之, 西村 吾朗, 小林 一道, 渡部 正夫
    Proceeding of the fifth Asian NIR symposium (ANS2016) 2016 O-6 72 - 73 2016年 [査読有り][通常論文]
  • Erina Miyakawa, Hiroyuki Fujii, Kiyohito Hattori, Yuki Tatekura, Kazumichi Kobayashi, Masao Watanabe
    Proceedings of the International Conference of Computational Methods in Sciences and Engineering 2016 (ICCMSE-2016) 1790  - 050003 2016年 [査読有り][通常論文]
     
    Diffuse optical tomography (DOT), which is still under development, has a potential to enable non-invasive diagnoses of thyroid cancers in the human neck using the near-infrared light. This modality needs a photon migration model because scattered light is used. There are two types of photon migration models: the radiative transport equation (RTE) and diffusion equation (DE). The RTE can describe photon migration in the human neck with accuracy, while the DE enables an efficient calculation. For developing the accurate and efficient model of photon migration, it is crucial to investigate a condition where the DE holds in a scattering medium including a void region under the refractive-index mismatch at the void boundary because the human neck has a trachea (void region) and the refractive indices are different between the human neck and trachea. Hence, in this paper, we compare photon migration using the RTE with that using the DE in the medium. The numerical results show that the DE is valid under the refractive-index match at the void boundary even though the void region is near the source and detector positions. Under the refractive-index mismatch at the boundary, the numerical results using the DE disagree with those using the RTE when the void region is near the source and detector positions. This is probably because the anisotropy of the light scattering remains around the void boundary.
  • Kazumichi Kobayashi, Kiyofumi Sasaki, Misaki Kon, Hiroyuki Fujii, Masao Watanabe
    30TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS (RGD 30) 1786 110002  2016年 [査読有り][通常論文]
     
    The aim of this study is to construct the kinetic boundary condition for Ar-Ne binary mixture in equilibrium using molecular dynamics (MD) simulations. The temperature of the MD simulation system is 85 K; Ar molecules behave as condensable gas (vapor), and Ne molecules behave as non-condensable gas (gas). In this simulation, we utilize the two-boundary method improved by our previous study to investigate behaviors of Ar and Ne molecules at the interface. From the results, we can obtain the molecular mass fluxes at the interface, and evaluate the values of evaporation and condensation coefficients of Ar (vapor) and Ne (gas) molecules.
  • Misaki Kon, Kazumichi Kobayashi, Masao Watanabe
    30TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS (RGD 30) 1786 110001  2016年 [査読有り][通常論文]
     
    To examine the transport phenomena in a vaporliquid two-phase system attributed to the phase change, a proper specification of the mass flux at a vaporliquid interface is crucial. Since the mass flux induced by the phase change originates from the motion of molecules in the vicinity of the vaporliquid interface, a continuum description such as the fluid dynamic based approach is inappropriate. An essential way to obtain this mass flux is the analysis of the Boltzmann equation with a certain boundary condition, that is, the kinetic boundary condition. In this study, we examined the definition and the estimation procedure of the evaporation coefficient, which is included in the kinetic boundary condition, at the vaporliquid interface with phase change, especially at higher temperature for hard-sphere molecules. As the result, we confirmed that a conventional definition of the evaporation coefficient is accurate even if liquid temperature is higher. Moreover, we also confirmed that the evaporation coefficient is only the function of liquid temperature by counting the number of molecules passing through the two boundaries which are placed near the vaporliquid interface.
  • Junya Kawahara, Masao Watanabe, Kazumichi Kobayashi
    Mechanical Engineering Letters 1 115-00464 - 15-00464 2015年12月 [査読有り][通常論文]
  • 加藤昌也, 渡部正夫, 小林一道, 真田俊之
    混相流 28 5 531 - 536 2015年03月 [査読有り][招待有り]
  • Kiyohito Hattori, Hiroyuki Fujii, Yuki Tatekura, Kazumichi Kobayashi, Masao Watanabe
    BIOPHOTONICS JAPAN 2015 9792 97921A  2015年 [査読有り][通常論文]
     
    An accurate determination of optical properties of agricultural products is crucial for non-destructive assessment of food quality. For the determination, light intensity is measured at the surface of the product; then, inverse analysis is employed based on a light propagation model such as the radiative transfer equation (RTE). The inverse analysis requires high computational loads because the light intensity is numerically calculated using the model every time the optical properties are changed. For the calculation, we propose an efficient technique by combining a numerical solution with an analytical solution of the RTE, and investigate the validity of the technique in a two-dimensional homogeneous circular medium which is regarded as a light propagation model with optical properties of kiwifruit. The proposed technique can provide accurate results of the light intensity in change of the optical properties, and the accuracy is less dependent on the boundary conditions and source-detector angles. In addition, the technique can reduce computation time compared with that for numerical calculation of the RTE. These results indicate usefulness of the proposed technique for the inverse analysis.
  • Junya Kawahara, Masao Watanabe, Kazumichi Kobayashi
    9TH INTERNATIONAL SYMPOSIUM ON CAVITATION (CAV2015) 656 1 - 5 2015年 [査読有り][通常論文]
     
    Pressure wave propagation in a liquid containing several bubbles is numerically investigated. We simulate liner plane wave propagation in a liquid containing 10 spherical bubbles in a rectangular duct with the equation of motion for N spherical bubbles. The sound pressures of the reflected waves from the rigid walls are calculated by using the method of images. The result shows that the phase velocity of the pressure wave propagating in the liquid containing 10 spherical bubbles in the duct agrees well with the low-frequency speed of sound in a homogeneous bubbly liquid.
  • Y. Jinbo, K. Kobayashi, M. Watanabe, H. Takahira
    9TH INTERNATIONAL SYMPOSIUM ON CAVITATION (CAV2015) 656 1 - 5 2015年 [査読有り][通常論文]
     
    The ghost fluid method is improved to include heat and mass transfer across the gas-liquid interface during the bubble collapse in a compressible liquid. This transfer is due to both nonequilibrium phase transition at the interface and diffusion of the noncondensable gas across the interface. In the present method, the ghost fluids are defined with the intention of conserving the total mass, momentum, and energy, as well as the mass of each component while considering the heat and mass fluxes across the interface. The gas phase inside the bubble is a mixture of vapor and noncondensable gas, where binary diffusion between the mixture components is taken into account. The gas diffusion in the surrounding liquid is also considered. This method is applied to a simulation of a single spherical bubble collapse with heat and mass transfer across the interface in a compressible liquid. When noncondensable gas is present, it accumulates near the interface due to vapor condensation, thereby preventing further condensation. This results in a weaker bubble collapse than the case without noncondensable gas.
  • Y. Tatekura, T. Fujikawa, Y. Jinbo, T. Sanada, K. Kobayashi, M. Watanabe
    ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY 4 9 N117 - N123 2015年 [査読有り][通常論文]
     
    A two-fluid spray cleaning technique has been gaining popularity as a cleaning process in the semiconductor industry. The most essential physical process in this technique is the impact of droplets with a velocity of O(10 m/s) on a solid surface. This study aims to experimentally and numerically investigate water-droplet impacts with velocities of up to 50 m/s and their subsequent flow fields, especially the gas flow field in the strictly limited area in the vicinity of the contact line. First, we experimentally evaluated the velocity of the splash and numerically calculated the gas velocities. Comparison of these velocities supported our assumption that the maximum gas velocity may be on approximately the same order as the velocity of the splash. Therefore, we concluded that the gas velocity field of the order of 500 m/s indeed develops at the impact of droplet with a velocity of the order of 50 m/s. Moreover, we determined that the gas pressure was of the order of 1.0 MPa by numerical analysis. Such a high pressure leads to shock wave propagation, which can contribute to the cleaning process in semiconductor production. (C) 2015 The Electrochemical Society. All rights reserved.
  • Misaki Kon, Kazumichi Kobayashi, Masao Watanabe
    PHYSICS OF FLUIDS 26 7  - 072003 2014年07月 [査読有り][通常論文]
     
    The aim of the present study is to develop the method of determining the kinetic boundary condition (KBC) at a vapor-liquid interface in net evaporation/condensation. We proposed a novel method for determining the KBC by combining the numerical simulations of the mean field kinetic theory and the molecular gas dynamics. The method was evaluated on steady vapor flow between two liquid slabs at different temperatures. A uniform net mass flux in the vapor phase induced by net evaporation and condensation is obtained from the numerical simulation of the mean field kinetic theory for both vapor and liquid phases. The KBC was specified by using the uniform net mass flux, and the numerical simulation of the molecular gas dynamics was conducted for the vapor phase. Comparing the macroscopic variables in the vapor phase obtained from both numerical simulations, we can validate the KBC whether the appropriate solutions are obtained. Moreover, the evaporation and condensation coefficients were estimated uniquely. The results showed that the condensation and evaporation coefficients were identical and constant in net evaporation. On the other hand, in net condensation, the condensation coefficient increased with the collision molecular mass flux. We also presented the applicable limit of the KBC which is assumed to be the isotropic Gaussian distribution at the liquid temperature. From these results, the KBCs in net evaporation and condensation, which enable the exact macroscopic variables to be determined, were proposed. (C) 2014 AIP Publishing LLC.
  • Kazumichi Kobayashi, Kazumasa Hori, Hisao Yaguchi, Masao Watanabe
    PROCEEDINGS OF THE 29TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 1628 404 - 410 2014年 [査読有り][通常論文]
     
    By using molecular dynamics simulations of argon molecules, the present study investigates molecular evaporation and reflection in equilibrium at a vapor liquid interface, which involves the kinetic boundary condition (KBC) of the Boltzmann equation. The present method allows evaporation and reflection molecules to be selected naturally at the vapor-liquid interphase. Based on the results, we confirm that the evaporation molecules in the equilibrium state behave almost similar to spontaneous evaporation molecules (as determined by virtual vacuum evaporation simulations). Furthermore, we find that the velocity distribution of reflection molecules in the normal direction to the boundary is lower than the Maxwell distribution at the liquid temperature.
  • Misaki Kon, Kazumichi Kobayashi, Masao Watanabe
    PROCEEDINGS OF THE 29TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 1628 398 - 403 2014年 [査読有り][通常論文]
     
    This study aims to investigate the liquid temperature dependency of the kinetic boundary condition at a vapor-liquid interface in net evaporation/condensation. The numerical simulations based on the mean-field kinetic theory and the molecular gas dynamics in the cases of various liquid temperatures were carried out. We focused on two important issues for the kinetic boundary condition; one is to investigate the applicable limit of the kinetic boundary condition which is assumed to be the isotropic velocity distribution at the liquid temperature and the other is to estimate the value of the condensation coefficient included in the kinetic boundary condition. The simulation results showed that the applicable limit of the isotropic velocity distribution in net evaporation/condensation practically independent from the liquid temperature. Furthermore, the condensation coefficients in net evaporation/condensation depend significantly on the liquid temperature; the condensation coefficient is constant and equal to the evaporation coefficient in net evaporation, while, in net condensation, the condensation coefficient increases with the increase of the degree of nonequilibrium.
  • 川原 潤也, 小林 一道, 渡部 正夫
    数理解析研究所講究録 1847 10 - 15 京都大学 2013年08月 [査読無し][通常論文]
  • 小林一道, 毛利信吾, 渡邉優介, 渡部正夫, 藤川重雄
    Netsu Bussei 27 1 9 - 14 2013年01月 [査読有り][通常論文]
  • Molecular Dynamics Study of Nano-scale Liquid-gas Interface Inspired by Fuel Cell Catalyst Layer
    Youngmin Kim, Hisao Yaguchi, Nobuyuki Oshima, Masao Watanabe, Kazumichi Kobayashi
    ASME 2013 11th International Conference on Nanochannels 2013年 [査読有り][通常論文]
  • 稲葉匡司, 矢野猛, 小林一道, 渡部正夫
    ながれ 31 6 487 - 490 2012年12月25日 [査読無し][通常論文]
  • Tetsuya Kanagawa, Takeru Yano, Junya Kawahara, Kazumichi Kobayashi, Masao Watanabe, Shigeo Fujikawa
    NONLINEAR ACOUSTICS: STATE-OF-THE-ART AND PERSPECTIVES (ISNA 19) 1474 144 - 147 2012年 [査読有り][通常論文]
     
    Weakly nonlinear propagation of diffracted ultrasound beams in a nonuniform bubbly liquid is theoretically studied based on the method of multiple scales with the set of scaling relations of some physical parameters. It is assumed that the spatial distribution of the number density of bubbles in an initial state at rest is a slowly varying function of space coordinates and the amplitude of its variation is small compared with a mean number density. As a result, a Khokhlov-Zabolotskaya-Kuznetsov (KZK) equation with dispersion and nonuniform effects for a low frequency case and a nonlinear Schrodinger (NLS) equation with dissipation, diffraction, and nonuniform effects for a high frequency case, are derived from the basic equations of bubbly flows.
  • Masashi Inaba, Takeru Yano, Masao Watanabe, Kazumichi Kobayashi, Shigeo Fujikawa
    NONLINEAR ACOUSTICS: STATE-OF-THE-ART AND PERSPECTIVES (ISNA 19) 1474 80 - 83 2012年 [査読無し][通常論文]
     
    Resonant gas oscillation in a closed tube bounded by an oscillating plate and a vapor-liquid interface is theoretically analyzed by applying the asymptotic theory to the ES-BGK Boltzmann equation for the case of M-2 similar or equal to Kn << 1 and a small evaporation coefficient alpha = O(Kn), where M and Kn are the typical Mach number and the Knudsen number, respectively. As a result, we derive a nonlinear integro-differential equation for determining the wave profile with the evaporation and condensation in the form including alpha.
  • Masashi Inaba, Takeru Yano, Kazumichi Kobayashi, Masao Watanabe
    28TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2012, VOLS. 1 AND 2 1501 53 - 58 2012年 [査読有り][通常論文]
     
    Resonant gas oscillation in a closed tube bounded by an oscillating plate and a vapor-liquid interface is theoretically analyzed by applying the asymptotic theory to the ES-BGK Boltzmann equation for the case of M-P similar to Kn << 1 and a small evaporation coefficient alpha = O(root Kn), where M-P and Kn are the Mach number of the plate and the Knudsen number, respectively. As a result, we derive a nonlinear integro-differential equation for determining the wave profile with the evaporation and condensation including alpha. We numerically solve the integro-differential equation with the method of Fourier series, and obtain a parameter plane for shock formation conditions and also the prediction of critical condition for shock formation.
  • Kazumichi Kobayashi, Kotaro Ohashi, Masao Watanabe
    28TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2012, VOLS. 1 AND 2 1501 1145 - 1151 2012年 [査読有り][通常論文]
     
    In this study, equilibrium and nonequilibrium numerical simulations for vapor-liquid two-phase systems were performed by using the Enskog-Vlasov equation. The kinetic boundary condition (KBC) at the interface was investigated. The simulation results showed that at a low or slightly high liquid temperature, the velocity distribution of the KBC obtained by our simulation is anisotropic Gaussian; this result agrees qualitatively with the results of the MD simulation performed by Ishiyama et al. (PRL, 2005). Also, the nonequilibrium nature of KBC becomes larger with the increase of liquid temperature.
  • 真田俊之, 橋本健太郎, 林田充司, 小林 一道, 渡部正夫
    混相流 26 2 172 - 177 2012年 [査読有り][通常論文]
  • 櫻井泰貴, 小林一道, 藤川俊秀, 真田俊之, 渡部正夫
    混相流 26 2 164 - 171 2012年 [査読有り][通常論文]
  • NONLINEAR PROPAGATION OF SOUND BEAM IN NONUNIFORM BUBBLY LIQUIDS
    Tetsuya Kanagawa, Takeru Yano, Junya Kawahara, Kazumichi Kobayashi, Masao Watanabe, Shigeo Fujikawa
    FLUID MEASUREMENTS AND INSTRUMENTATION CAVITATION AND MULTIPHASE FLOW ADVANCES IN FLUIDS ENGINEERING EDUCATION MICROFLUIDICS, VOL 2 237 - 241 2012年 [査読有り][通常論文]
     
    Nonlinear propagation of weakly diffracted sound beams in a weakly nonuniform bubbly liquid is analytically studied based on the method of multiple scales and scaling relations of some physical parameters. The system of basic equations consists of the conservation equations of mass and momentum for gas and liquid in a two-flui model, the Keller equation for bubble wall, the state equations for gas and liquid, and so on. The compressibility of liquid is taken into account and this leads to the wave attenuation due to bubble oscillations. It is assumed that the spatial distribution of the number density of bubbles in an initial state at rest is a slowly varying function of space coordinates and the amplitude of its variation is small compared with a mean number density. As a result, a Khokhlov-Zabolotskaya-Kuznetsov (KZK) equation with dispersion and nonuniform effects for a low frequency and long wavelength case and a nonlinear Schrodinger (NLS) equation with dissipation, diffraction, and nonuniform effects are derived from the basic equations.
  • ULTRASOUND BEAM RADIATED FROM CIRCULAR PISTON IN BUBBLY LIQUIDS: NONLINEAR ANALYSIS FOR ENVELOPE OF SHORT WAVES WITH DIFFRACTION EFFECT
    Junya Kawahara, Tetsuya Kanagawa, Takeru Yano, Kazumichi Kobayashi, Masao Watanabe, Shigeo Fujikawa
    FLUID MEASUREMENTS AND INSTRUMENTATION CAVITATION AND MULTIPHASE FLOW ADVANCES IN FLUIDS ENGINEERING EDUCATION MICROFLUIDICS, VOL 2 251 - 256 2012年 [査読有り][通常論文]
     
    A weakly diffracted ultrasound beam radiated from a circular piston placed in a bubbly liquid is formulated in terms of a wave equation based on scaling relations of physical parameters [1]: typical propagation speed, period, wavelength, and diameter of beam. We derive a nonlinear evolution equation for the modulation of quasi-monochromatic waves for the case of a short wavelength with a moderately high frequency from a set of basic equations for bubbly flows: conservation equations of mass and momentum for gas and liquid in a two-fluid model, Keller's equation for bubble wall motion, state equations for gas and liquid, and so on. The compressibility of liquid is taken into account, and thus the waves are attenuated due to bubble oscillations. The viscosity of gas, heat conduction in gas and liquid, and phase change across bubble wall are ignored. As a result, the nonlinear Schrodinger equation for the envelope of the beam with diffraction effect is derived from the basic equations. For plane waves the diffraction term does not appear, and hence our equation is reduced to the original nonlinear Schrodinger equation [1].
  • Kazumichi Kobayashi, Tetsuya Kodama, Hiroyuki Takahira
    Physics in Medicine and Biology 56 19 6421 - 6440 2011年10月 [査読有り][通常論文]
     
    Archive(HUSCAP)-> http://hdl.handle.net/2115/47143
  • 田中佑樹, 小林一道, 高比良裕之
    混相流 24 5 559 - 566 2011年03月 [査読有り][招待有り]
  • T. Fujikawa, Y. Tatekura, K. Kobayashi, T. Sanada, A. Hayashida, M. Watanabe
    SEMICONDUCTOR CLEANING SCIENCE AND TECHNOLOGY 12 (SCST 12) 41 5 67 - 74 2011年 [査読無し][通常論文]
     
    In the steam-water mixed spray-cleaning technique, droplet impact on the solid surface is the one of the primarily important physical processes. We experimentally studied a droplet impact on a solid place that moves with a speed ranging from 1 to 50 m/s using high-speed video camera. We observed that high-speed liquid film flows radially outward along the surface just after the impact. In addition, we also observed that liquid turns into corona splash in the cases of higher impact velocities. These flows with large velocities can generate huge shear stress on the solid surface, which may contribute to cleaning. Furthermore, we numerically studied the velocity field development and found that gas flow field may also contribute in advecting removed particles or stripped resists away from the original place.
  • 小林一道, 神保佳典, 高比良裕之
    日本機械学会論文集 (B編) 77 773 20 - 32 2011年01月 [査読有り][通常論文]
  • 神保佳典, 高比良裕之, 小林一道, 安田章宏
    日本機械学会論文集 (B編) 76 762 230 - 238 2010年 [査読有り][通常論文]
  • 神保佳典, 高比良裕之, 小林一道, 安田章宏
    日本機械学会論文集 (B編) 76 762 219 - 229 2010年 [査読有り][通常論文]
  • Hiroyuki Takahira, Kazumichi Kobayashi, Takahiro Matsuno
    International Journal of Emerging Multidisciplinary Fluid Sciences 1 2 85 - 99 2009年 [査読有り][通常論文]
  • Kazumichi Kobayashi, Shunsuke Watanabe, Daigo Yamano, Takeru Yano, Shigeo Fujikawa
    FLUID DYNAMICS RESEARCH 40 7-8 585 - 596 2008年07月 [査読有り][通常論文]
     
    The condensation coefficient of water at a vapor-liquid interface is determined by combining shock tube experiments and numerical simulations of the Gaussian-BGK Boltzmann equation. The time evolution in thickness of a liquid film, which is formed on the shock tube endwall behind the shock wave reflected at the endwall, is measured with an optical interferometer consisting of the physical beam and the reference one. The reference beam is utilized to eliminate systematic noises from the physical beam. The growth rate of the film is evaluated from the measured time evolution and it is incorporated into the kinetic boundary condition for the Boltzmann equation. From a numerical simulation using the boundary condition, the condensation coefficient of water is uniquely deduced. The results show that, in a condition of weak condensation near a vapor-liquid equilibrium state, the condensation coefficient of water is almost equal to the evaporation coefficient estimated by molecular dynamics simulations near a vapor-liquid equilibrium state and it decreases as the system becomes a nonequilibrium state. The condensation coefficient of water is nearly identical with that of methanol [Mikami, S., Kobayashi, K., Ota, T., Fujikawa, S., Yano, T., Ichijo, M., 2006. Molecular gas dynamics approaches to interfacial phenomena accompanied with condensation. Exp. Therm. Fluid Sci. 30, 795-800]. (c) 2008 The Japan Society of Fluid Mechanics and Elsevier B.V. All rights reserved.
  • S. Mikami, K. Kobayashi, T. Ota, S. Fujikawa, T. Yano, M. Ichijo
    EXPERIMENTAL THERMAL AND FLUID SCIENCE 30 8 795 - 800 2006年08月 [査読有り][通常論文]
     
    This paper deals with the condensation coefficient of methanol, which is evaluated from a condensation rate at the vapor-liquid interface. Film condensation is induced on the endwall of a vapor-filled shock tube, when a shock wave is reflected at the endwall and the vapor becomes supersaturated there. The liquid film grows with the lapse of time. The evolution in time of the liquid film thickness is measured by an optical interferometer with a high accuracy, and thereby the net condensation mass flux at the interface is obtained. The mass flux is incorporated into the kinetic boundary condition (KBC) at the interface for the Gaussian-BGK Boltzmann equation. Such a treatment of the boundary condition makes it possible to formally eliminate the evaporation and condensation coefficients in KBC and to obtain the unique numerical solution of the vapor-liquid system. In this way, the instantaneous condensation coefficient is accurately evaluated from the conformity with experiment and numerical solution. It is found that the values of condensation coefficient are, near vapor-liquid equilibrium states, close to those evaluated by molecular dynamics simulations. (C) 2006 Published by Elsevier Inc.
  • T Yano, K Kobayashi, S Fujikawa
    Rarefied Gas Dynamics 762 208 - 213 2005年 [査読有り][通常論文]
     
    On the basis of the polyatomic gas version of the Gaussian-BGK model of the Boltzmann equation, we shall numerically analyze the condensation of methanol vapor onto its liquid film on an endwall of the shock tube induced by the pressure elevation due to a reflected shock wave. By comparing the numerical results with experimental ones, we can determine the value of condensation coefficient in various nonequilibrium conditions. It is shown that at around room temperature, the condensation coefficient of methanol vapor is almost unity when the condensation is sufficiently weak. In this case, the asymptotic analysis for the steady problem gives an appropriate estimation for the rate of the growth of the liquid film thickness.
  • 日本機械学会論文集
    矢野猛, 小林一道, 藤川重雄 71 702 428 - 435 2005年 [査読有り][通常論文]
  • S Fujikawa, T Yano, K Kobayashi, K Iwanami, M Ichijo
    EXPERIMENTS IN FLUIDS 37 1 80 - 86 2004年07月 [査読有り][通常論文]
     
    This paper deals with a molecular gas-dynamics method applied to the accurate determination of the condensation coefficient of methanol vapor. The method consisted of an experiment using a shock tube and computations using a molecular gas-dynamics equation. The experiments were performed in such situations where the shift from a vapor-liquid equilibrium state to a nonequilibrium one is realized by a shock wave in a scale of molecular mean free time of vapor molecules. The temporal evolution in thickness of a liquid film formed on the shock-tube endwall behind a reflected shock wave is measured by an optical interferometer. By comparing the measured liquid-film thickness with numerical solutions for a polyatomic version of the Gaussian-BGK model of the Boltzmann equation, the condensation coefficient of methanol vapor is accurately determined in vapor-liquid nonequilibrium states. As a result, it is clear that the condensation coefficient is just unity very near to an equilibrium state, but is smaller far from the equilibrium state.

書籍

  • 蒸発・凝縮を伴う球形気泡の崩壊現象における凝縮係数の影響
    S. Morikawa, Y. Tatekura, K. Kobayashi, H. Fujii, M. Watanabe, K. Sasaki (担当:共著)
    日本流体力学会 「ながれ」 2017年05月 105-108 
    ながれ NAGARE 36
  • Liquid temperature dependence of kinetic boundary condition at vapor–liquid interface
    Misaki Kon, Kazumichi Kobayashi, Masao Watanabe (担当:共著)
    Advanced in Engineering 2017年03月 
    https://advanceseng.com/mechanical-engineering/liquid-temperature-dependence-kinetic-boundary-condition-vapor-liquid-interface/
  • 北海道大学大学院工業研究院 機械宇宙工学部門 流体力学研究室
    渡部正夫, 小林一道, 藤井宏之 (担当:共著)
    混相流 Vol.30 No.4 日本混相流学会 2016年12月
  • 気液界面での質量・運動量・エネルギーの輸送 ―分子動力学,分子気体力学,実験の融合― 第5章 蒸発・凝縮の衝撃波管による実験
    小林一道, 藤川重雄 (担当:共著)
    日本流体力学会,ながれ 2014年12月 543-548 
    ながれ Nagare 33
  • 日本混相流学会 混相流シンポジウム2014 報告
    村井祐一, 小林一道 
    混相流 Vol.28 No.4 日本混相流学会 2014年12月 4
  • 気液界面での質量・運動量・エネルギーの輸送 ―分子動力学,分子気体力学,実験の融合― 第4章 蒸発・凝縮への分子気体力学の適用
    小林一道, 藤川重雄 (担当:共著)
    日本流体力学会,ながれ 2014年10月 453-459 
    ながれ NAGARE 33
  • 気液界面ダイナミクスのマルチスケール解析
    小林一道 
    えんじにあRing 北海道大学工学研究院・工学院 広報誌 2013年10月 1 
    https://www.eng.hokudai.ac.jp/engineering/2013-10/index.html
  • 相互作用を考慮した球形気泡離散モデルの解析(気泡流の音響特性)
    川原潤也, 小林一道, 渡部正夫 
    京都大学数理解析研究所講究録 2013年
  • 蒸発・凝縮をともなう非線形共鳴音波
    稲葉匡司, 矢野猛, 小林一道, 渡部正夫 (担当:共著)
    日本流体力学会,ながれ 2012年12月 487-490 
    ながれ NAGARE 31
  • 流体物理洗浄の概要と水蒸気二流体ジェットでの適用例
    真田俊之, 小林一道, 林田充司 (担当:共著)
    産業洗浄 2012年 14-19
  • 気泡力学へのGhost Fluid法の適用
    高比良裕之, 小林一道 
    日本機械学会 流体工学部門 ニューズレター「流れ」9月号 2009年 
    http://www.jsme-fed.org/newsletters/2009_9/no5.html#ctop
  • Handbook of Interferometers: Research, Technology and Application
    Nova Science Publishers 2009年 (ISBN: 9781607410508)

講演・口頭発表等

  • Numerical simulation of vapor bubble collapse with a small amount of non-condensable gas based on molecular gas dynamics  [招待講演]
    Kazumichi Kobayashi
    Japan-Korea CFD Workshop 2019年11月 口頭発表(招待・特別)
  • Surrounding gas-independent splash at high-velocity drop impact with a projected smooth solid surface  [通常講演]
    M. Watanabe, T. Ashida, K. Kobayashi, H. Fujii, T. Sanada
    The 72nd Annual Meeting of the American Physical Society’s Division of Fluid Dynamics 2019年11月 口頭発表(一般)
  • Molecular Dynamics Study on Influence of Liquid-solid Intermolecular Force on Levitating Mechanism of Impacting Nanodroplet on Heated Wall  [通常講演]
    H. Tabe, K. Kobayashi, H. Yaguchi, H. Fujii, M. Watanabe
    Surface Wettability Effects on Phase Change Phenomena(SWEP) 2019年06月 ポスター発表
  • Molecular Gas Dynamics Analysis of Vapor-Gas Flow inside Collapsing Bubble  [通常講演]
    K. Yamamot, K. Kobayashi, H. Fujii, M. Watanabe, M. Kon, H. Takahira
    31th International Symposium on Rarefied Gas Dynamics (RGD31) 2018年07月 口頭発表(一般)
  • Influence of Surface Roughness of High Temperature Wall on Levitation of Impacting Droplet Based on Molecular Dynamics Simulation  [通常講演]
    H. Tabe, K. Kobayashi, H. Yaguchi, H. Fujii, M. Watanabe
    Surface Wettability Effects on Phase Change Phenomena(SWEP) 2018年05月 ポスター発表 
    SWEP BOOK of Abstract, p. 27
  • Molecular Dynamics Study of Droplet Impact on High-Temperature Wall  [通常講演]
    H. Tabe, K. Kobayashi, H. Yaguchi, H. Fujii, M. Watanabe
    The 7th East Asia Mechanical and Aerospace Engineering Workshop 2017年11月 口頭発表(一般) 
    1 page
  • Numerical Investigation of Light and Pressure Propagation in Biological Tissue for Model-Based Photoacoustic Tomography  [通常講演]
    K. Tabayashi, H. Fujii, K. Kobayashi, M. Watanabe
    The Ninth JSME-KSME Thermal and Fluids Engineering Conference 2017年10月 口頭発表(一般) 
    TFEC9-1526, 4 pages
  • Numerical and Experimental Analysis of Droplet Impact in Vapor Environment  [通常講演]
    S. Sawai, T. Isono, H. Fujii, K. Kobayashi, M. Watanabe, T. Sanada
    The Ninth JSME-KSME Thermal and Fluids Engineering Conference 2017年10月 口頭発表(一般) 
    TFEC9-1491, 5 pages
  • Does Chemical Properties of Solid Surface Cause Liquid Film Flow Instability at Droplet Impact?  [通常講演]
    S. Tanimoto, M. Watanabe, K. Kobayashi, H. Fujii, T. Sanada
    The Ninth JSME-KSME Thermal and Fluids Engineering Conference 2017年10月 口頭発表(一般) 
    TFEC9-­1334, 4 pages
  • Observation of Splash Generated Immediately After the Impact of a High-Speed Droplet in Reduced-Pressure  [通常講演]
    T. Ashida, M. Watanabe, K. Kobayashi, H. Fujii, T. Sanada
    The Ninth JSME-KSME Thermal and Fluids Engineering Conference 2017年10月 口頭発表(一般) 
    TFEC9-­1485, 4 pages
  • Micro-Droplets Generation Induced by Interactions Between Focused Ultrasound and a Liquid Surface  [通常講演]
    K. Seko, K. Kobayashi, H. Fujii, M. Watanabe
    The Ninth JSME-KSME Thermal and Fluids Engineering Conference 2017年10月 口頭発表(一般) 
    TFEC9-1173, 3 pages
  • Molecular Dynamics Simulation of the Role of the Wettability in the Droplet Impact on a High-Temperature Wall  [通常講演]
    H. Tabe, K. Kobayashi, H. Yaguchi, H. Fujii, M. Watanabe
    The Ninth JSME-KSME Thermal and Fluids Engineering Conference 2017年10月 口頭発表(一般) 
    TFEC9-1492, 4 pages
  • 気液界面での熱・物質輸送を考慮したマイクロバ ブル崩壊現象の分子流体力学解析  [招待講演]
    小林 一道
    日本機械学会年次大会2017 2017年09月 口頭発表(招待・特別) 
    【招待講演】
  • 蒸気雰囲気中の液滴衝突に関する実験・分子流体力学解析  [招待講演]
    小林 一道
    若手研究者夏季セミナー(混相流シンポジウム2017) 2017年08月 口頭発表(招待・特別) 
    【招待講演】
  • Numerical simulation of spherical vapor-gas bubble collapse  [招待講演]
    Kazumichi Kobayashi, Misaki Kon, Takahiro Nagayama, Hiroyuki Fujii, Masao Watanabe, Hiroyuki Takahirav
    Japan-U.S. Seminar on Two-Phase Flow Dynamics 2017年06月 口頭発表(招待・特別) 
    【招待講演】
  • Numerical simulation of pressure generated at the liquid droplet impact on a solid surface  [通常講演]
    Y. Tatekura, M. Watanabe, K. Kobayashi, T. Sanada
    The 3rd International Conference on Numerical Methods in Multiphase Flows 2017年06月 口頭発表(一般) 
    B62, 2 pages
  • Quantitative Method to Determine the Optical Properties of Melons by the Photon Diffusion Equation  [通常講演]
    K. Hattori, H. Fujii, G. Nishimura, K. Kobayashi, M. Watanabe
    The 5th Asian NIR Symposium 2016年11月 口頭発表(一般)
  • Optical properties of melons determined by an analysis based on the photon diffusion equation  [通常講演]
    K. Hattori, H. Fujii, G. Nishimura, K. Kobayashi, M. Watanabe
    1st Food Chemistry Conference 2016年10月 口頭発表(一般)
  • 気液界面のナノスケール熱流体力学  [招待講演]
    小林 一道
    日本機械学会2016年度年次大会 流体工学部門企画 複雑流動現象の解析技術と学理構築 (Ⅰ マイクロ流れ,分子流,機能性流体) 2016年09月 口頭発表(招待・特別) 九州大学伊都キャンパス 日本機械学会
     
    【招待講演】
  • Misaki Kon, Kobayashi Kobayashi, Masao Watanabe
    The 30th International Symposium on Rarefied Gas Dynamics 2016年07月 口頭発表(一般) University of Victoria Victoria BC Canada 
    AIP Conf. Proc., Vol. 1786, 110001 (2016)
  • Kazumichi Kobayashi, Kiyofumi Sasaki, Misaki Kon, Hiroyuki Fujii, Masao Watanabe
    The 30th International Symposium on Rarefied Gas Dynamics 2016年07月 口頭発表(一般) University of Victoria Victoria BC Canada 
    AIP Conf. Proc., 1786, 110002, (2016)
  • Effects of surrounding gas temerature on ethanol droplet impact on solid surface  [通常講演]
    T. Isono, M. Watanabe, K. Kobayashi, H. Fujii, T. Sanada
    9th International conference on multiphase flow (ICMF2016) 2016年05月 口頭発表(一般)
  • Observation of non-sperical droplet imacts with velocities of O(10 m/s)  [通常講演]
    Y. Kataoka, Y. Hori, M. Watanabe, K. Kobayashi, H. Fujii, T. Sanada
    9th International conference on multiphase flow (ICMF2016) 2016年05月 口頭発表(一般)
  • Numerical analysis of bubble dynamics with vapor-liquid boundary conditions derived from molecular gas dynamics  [通常講演]
    S. Morikawa, J. Jinbo, Y. Tatekura, K. Kobayashi, M. Watanabe, H. Fujii, K. Sasaki
    9th International conference on multiphase flow (ICMF2016) 2016年05月 口頭発表(一般)
  • Numerical simulation of vapor-gas bubble dynamics based on molecular gas dynamics  [通常講演]
    T. Nagayama, M. Kon, K. Kobayashi, M. Watanabe, H. Fujii, H. Takahira
    9th International conference on multiphase flow (ICMF2016) 2016年05月 口頭発表(一般)
  • Misaki Kon, Kobayashi Kobayashi, Masao Watanabe
    2nd European conference on non-equilibrium gas flow 2015年12月 口頭発表(一般) Eindhoven, the Netherlands 
    Proceedings of 2nd European conference on non-equilibrium gas flow, No. 50, 1 page.
  • Numerical simulation of bubble collapse and tranfer of vapor and noncondensable gas through the bubble interface using the ghost fluid method  [通常講演]
    Y. Jinbo, K. Kobayashi, M. Watanabe, H. Takahira
    9th International symposium on cavitation (CAV2015) 2015年12月 口頭発表(一般)
  • Study on Pressure Wave Propagation in a Liquid Containing Spherical Bubbles in a Rectangular Duct  [通常講演]
    J. Kawahara, M. Watanabe, K. Kobayashi
    9th International symposium on cavitation (CAV2015) 2015年12月 口頭発表(一般)
  • Numerical study of Light Propagation in Agricultural Products for Non-destructive Assessment of Food Quality  [通常講演]
    K. Hattori, H. Fujii, Y. Tatekura, K. Kobayashi, M. Watanabe
    Biophotonics Japan 2015年10月 口頭発表(一般)
  • Numerical simulation of compressible two-phase flows in high-speed impingement of a hollow droplet on a solid wall  [招待講演]
    Y. Jinbo, K. Kobayashi, M. Watanabe, T. Sanada
    EMN Meeting on Droplets 2015年05月 
    【Invited】Total 1 page
  • Molecular dynamics simulation on evaporation molecules in a vapor-liquid equilibrium state  [通常講演]
    Kazumichi Kobayashi, Kazumasa Hori, Hisao Yaguchi, Masao Watanabe
    THE 29TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2014年07月 口頭発表(一般) Xi'an, China 
    AIP Conf. Proc. 1628, 404 (2014); http://dx.doi.org/10.1063/1.4902621
  • Numerical analysis of kinetic boundary conditions at net evaporation/condensation interfaces in various liquid temperatures based on mean-field kinetic theory  [通常講演]
    Misaki Kon, Kazumichi Kobayashi, Masao Watanabe
    THE 29TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2014年07月 口頭発表(一般) Xi'an, China 
    AIP Conf. Proc. 1628, 398 (2014); http://dx.doi.org/10.1063/1.4902620
  • Acoustic Characteristics of Compressible Bubbly Liquids: Study Based on Equation of Motion of Spherical Bubbles  [通常講演]
    Junya KAWAHARA, Kazumichi KOBAYASHI, Masao WATANABE
    8th International Conference on Multiphase Flow 2013年05月 
    No. 260, Total 5 pages
  • Numerical simulations of impact pressure generated by single-droplet impact  [通常講演]
    Yuki Tatekura, Kazumichi Kobayashi, Masao Watanabe
    8th International Conference on Multiphase Flow 2013年05月 口頭発表(一般) 
    No. 521, Total 5 pages
  • Numerical analysis of nonequilibrium phase change phenomena between two liquid slabs with different temperature  [通常講演]
    Kon M, Kobayashi K, Watanabe M
    13th UK Heat Transfer conference 2013年 
    No. 41, Total 6 pages, 2013
  • Numerical analysis of vapor-liquid two-phase system based on the Enskog-Vlasov equation  [通常講演]
    Kazumichi Kobayashi, Kotaro Ohashi, Masao Watanabe
    THE 28TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2012年07月 口頭発表(一般) 
    AIP Conf. Proc.
  • Nonlinear Resonant Gas Oscillation Accompanied with Evaporation and Condensation  [招待講演]
    Masashi Inaba, Takeru Yano, Kazumichi Kobayashi, Masao Watanabe
    THE 28TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2012年07月 口頭発表(招待・特別) 
    【INVITED】AIP Conf. Proc.
  • Resonant Gas Oscillation with Evaporation and Condensation  [通常講演]
    M. Inaba, T. Yano, M. Watanabe, K. Kobayashi
    19th International Symposium on Nonlinear Acoustics 2012年 口頭発表(一般) 
    AIP Conf. Proc., No. 1474, pp.79-82, (2012).
  • Derivation of Nonlinear Wave Equations for Ultrasound Beam in Nonuniform Bubbly Liquids  [通常講演]
    T. Kanagawa, T. Yano, J. Kawahara, K. Kobayashi, M. Watanabe, S. Fujikawa
    19th International Symposium on Nonlinear Acoustics 2012年 口頭発表(一般) 
    AIP Conf. Proc., No. 1474, pp.143-146, (2012).
  • Innovative Ultra-Low Environmental Load Cleaning Method Using Steam-Water Mixed Spray: II. Micro-Scale Approach  [通常講演]
    M. Watanabe, K. Kobayashi, T. Sanada
    6th Japanese-European Two-Phase Flow Group Meeting 2012年 口頭発表(一般) 
    Total 6 pages (CD-ROM), (2012)
  • Innovative Ultra-Low Environmental Load Cleaning Method Using Steam-Water Mixed Spray: I. Macro-Scale Approach  [通常講演]
    T. Sanada, M. Watanabe, K. Kobayashi
    6th Japanese-European Two-Phase Flow Group Meeting 2012年 口頭発表(一般) 
    Total 6 pages (CD-ROM)
  • Droplet Impact as an Elementary Process of Physical Cleaning  [通常講演]
    K. Kobayashi, R. Uemura, M. Watanabe, T. Sanada, A. Hayashida
    9th International Conference on Fluid Dynamics 2012年 口頭発表(一般) 
    Total 2 pages (CD-ROM), (2012).
  • Ultrasound Beam Radiated From Circular Piston in Bubbly Liquids: Nonlinear Analysis for Envelope of Short Waves With Diffraction Effect  [通常講演]
    J. Kawahara, K. Kanagawa, T. Yano, K. Kobayashi, M. Watanabe, S. Fujikawa
    ASME-JSME-KSME 2011 Joint Fluids Engineering Conference 2011年 
    Paper No. AJK2011-33019, pp. 251-256 (2011).
  • Nonlinear Propagation of Sound Beam in Nonuniform Bubbly Liquids  [通常講演]
    T. Kanagawa, J. Kawahara, T. Yano, K. Kobayashi, M. Watanabe, S. Fujikawa
    ASME-JSME-KSME 2011 Joint Fluids Engineering Conference 2011年 口頭発表(一般) 
    Paper No. AJK2011-33017, pp. 237-241 (2011).
  • High-Speed Droplet Impact as an Elementally Process of Physical Cleaning  [通常講演]
    T. Fujikawa, Y. Tatekura, K. Kobayashi, T. Sanada, A. Hayashida, M. Watanabe
    ECS Meeting 2011年 口頭発表(一般) 
    ECS Transaction, Vol.41, pp. 67-74 (2011).
  • Numerical Analysis of Shock-Bubble Interactions near Tissue Boundaries  [通常講演]
    Kazumichi Kobayashi
    6th Japan-Taiwan Workshop on Mechanical and Aerospace Engineering 2011年 口頭発表(一般) 
    Total 8 pages (CD-ROM), (2011).
  • Direct Numerical Simulations of Bubble Collapse near a Tissue Surface with the Ghost Fluid Method  [通常講演]
    H. Takahira, K. Kobayashi
    157th meeting of Acoustic Society of America 2009年 口頭発表(一般) 
    Journal of Acoustic Society of America, 124, 2712
  • Influence of Shock-Bubble and Bubble-Bubble Interactions on the Collapse of a Cluster of Bubbles  [通常講演]
    K. Kobayashi, Y. Jinbo, H. Takahira
    7th International Symposium of Cavitation (Cav2009) 2009年 口頭発表(一般) 
    Total 11 pages (CD-ROM), No.53, (2009)
  • Numerical Investigations of Interactions between Shock Waves and Bubbles near Tissue Surface Using the Ghost Fluid Method  [通常講演]
    S. Syu, T. Matsuno, K. Kobayashi, H. Takahira
    7th JSME-KSME Thermal and Fluid Engineering Conference 2008年 口頭発表(一般) 
    Total 2 pages (CD-ROM,No.E322), (2008)
  • Molecular Gas Dynamics Simulations for the Collapse of Gas or Vapor Bubbles  [通常講演]
    K. Kobayashi, H. Takahira
    7th JSME-KSME Thermal and Fluid Engineering Conference 2008年 口頭発表(一般) 
    Total 2 pages (CD-ROM, No.E313), (2008).
  • Flow Structure and Bubble Fission of Gas-Liquid Two-Phase Venturi Tube Flows  [通常講演]
    K. Umeyama, K. Ikema, K. Kobayashi, H. Takahira
    7th JSME-KSME Thermal and Fluid Engineering Conference 2008年 口頭発表(一般) 
    Total 2 pages (CD-ROM,No.E122), (2008).
  • Molecular Gas Dynamics Simulation of the Collapse of Condensable Gas bubbles  [通常講演]
    K. Kobayashi, H. Takahira
    Cavitation in Turbo-Machinery & Medical Applications 2008年 口頭発表(一般) 
    pp.204-209(CD-ROM), (2008)
  • Numerical Analysis of Shock-Bubble Interactions near Boundaries Using the Ghost Fluid Method  [通常講演]
    K. Kobayashi, T. Matsuno, S. Syu, H. Takahira
    Cavitation in Turbo-Machinery & Medical Applications 2008年 口頭発表(一般) 
    pp.190-194, (CD-ROM), (2008).
  • Condensation Coefficient of Water in a Weak Condensation State  [通常講演]
    K. Kobayashi, S. Watanabe, D. Yamano, T. Yano, S. Fujikawa
    1st International Colloquium on Dynamics, Physics and Chemistry of Bubble and Gas-Liquid Boundaries 2007年 口頭発表(一般) 
    Total 10 pages (CD-ROM), (2007).
  • Shock-Tube-Deduced Condensation Coefficients of Methanol and Water Vapors  [通常講演]
    S. Watanabe, K. Kobayashi, M. Inaba, T. Yano, S. Fujikawa
    International Symposium on Advanced Fluid/Solid Science and Technology in Experimental Mechanics 2006年 口頭発表(一般) 
    Total 5 pages (CD-ROM, No.A10-4),(2006)
  • Molecular Gas Dynamics Approaches to Interfacial Phenomena Accompanied with Condensation  [通常講演]
    S. Mikami, K. Kobayashi, T. Ota, S. Fujikawa, T. Yano, M. Ichijo
    ECI International Conference on Heat Transfer and Fluid Flow in Microscale 2005年 口頭発表(一般) 
    Total 4 pages (CD-ROM, No.70), (2005)
  • A New Approach for Determination of Condensation Coefficient of Methanol by Combining Molecular Gas Dynamics Study and Shock Tube Experiment  [通常講演]
    K. Kobayashi, S. Fujikawa, T. Yano
    6th World Conference on Experimental Heat Transfer, Fluid Mechanics, and Thermodynamics 2005年 口頭発表(一般) 
    Total 5 pages (CD-ROM, No.7-b-7), (2005).
  • Numerical Computations of Vapor Condensation in Vapor-Liquid Nonequilibrium State at Shock Tube Endwall  [通常講演]
    K. Kobayashi, T. Yano, S. Fujikawa
    5th International Conference on Multiphase Flow 2004年 口頭発表(一般) 
    Total 9 pages (CD-ROM, No.413), (2004).
  • Numerical Analysis of Condensation Process of a Polyatomic Vapor behind a Reflected Shock Wave Based on the Kinetic Theory of Gases  [通常講演]
    K. Kobayashi, T. Yano, S. Fujikawa
    15th International Symposium on Transport Phenomena 2004年 口頭発表(一般) 
    Total 5 pages (CD-ROM, No.101), (2004).
  • Numerical Study of Condensation of a Polyatomic Vapor by a Shock Wave Based on the Kinetic Theory of Gases  [通常講演]
    T. Yano, K. Kobayashi, S. Fujikawa
    4th ASME/JSME Joint Fluids Engineering Conference 2003年 口頭発表(一般) 
    Total 6 pages (CD-ROM, No. FEDSM2003-45022), (2003).

その他活動・業績

受賞

  • 2008年04月 日本機械学会 日本機械学会賞(論文)
     衝撃波管管端でのメタノール蒸気の凝縮過程に関する分子気体力学解析
  • 2007年03月 日本熱物性学会 ベストプレゼンテーション賞
     衝撃波管管端で起こる膜状凝縮によって測定された水の凝縮係数 
    受賞者: 小林 一道
  • 2005年06月 The 1st CRIS International Symposium on Computational Science and Neuroscience Top Poster Award
     Determination of Condensation Coefficient of Methanol by Combining Molecular Gas Dynamics Simulation and Shock Tube Experiment 
    受賞者: Kazumichi Kobayashi

共同研究・競争的資金等の研究課題

教育活動情報

主要な担当授業

  • Advanced Fluid Engineering(流体工学E)
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 工学院
  • 流体工学特論
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 工学院
  • Molecular Fluid Dynamics(分子流体力学E)
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : Molecular Gas Dynamicd, Boltzmann Equation, Maxwell Transport Equation, Statistical Thermodynamics
  • 分子流体力学特論
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : Molecular Gas Dynamicd, Boltzmann Equation, Maxwell Transport Equation, Statistical Thermodynamics
  • Advanced Fluid Engineering(流体工学E)
    開講年度 : 2018年
    課程区分 : 博士後期課程
    開講学部 : 工学院
  • 流体工学特論
    開講年度 : 2018年
    課程区分 : 博士後期課程
    開講学部 : 工学院
  • Molecular Fluid Dynamics(分子流体力学E)
    開講年度 : 2018年
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : Molecular Gas Dynamicd, Boltzmann Equation, Maxwell Transport Equation, Statistical Thermodynamics
  • 分子流体力学特論
    開講年度 : 2018年
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : Molecular Gas Dynamicd, Boltzmann Equation, Maxwell Transport Equation, Statistical Thermodynamics
  • 国際交流Ⅱ
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 国際本部
  • 物理学Ⅰ
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 運動、力、運動の法則、仕事、エネルギー、運動量、保存則、剛体、流体、単振動、音と光、干渉、回折
  • 流体力学Ⅱ
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 流体力学、粘性、応力と変形速度、ナビエ・ストークス方程式、レイノルズ数、運動量理論、境界層、乱流
  • 熱流体力学演習Ⅰ
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 各種保存則,有効エネルギー,理想気体,検査体積,ベルヌーイの定理,粘性流体の流れ

大学運営

委員歴

  • 2020年04月 - 現在   日本流体力学会   代議員
  • 2020年01月 - 現在   日本熱物性学会   評議員
  • 2018年08月 - 現在   日本混相流学会   評議員
  • 2018年04月 - 現在   日本機械学会   日本機械学会論文集編修委員会 アソシエイトエディタ
  • 2012年 - 現在   応用物理学会 界面ナノ電子化学研究会   運営委員
  • 2018年04月 - 2020年03月   日本機械学会RC277分科会   幹事
  • 2018年12月 - 2019年11月   第33回数値流体力学シンポジウム   実行委員
  • 2017年08月 - 2019年08月   日本混相流学会   ICeM委員
  • 2016年08月 - 2019年08月   日本混相流学会   編集委員
  • 2018年04月 - 2019年03月   日本機械学会 流体工学部門   広報委員会
  • 2017年11月 - 2018年12月   第16回流れの夢コンテスト   実行委員長
  • 2017年11月 - 2018年11月   日本機械学会 第96期 流体工学部門講演会   実行委員
  • 2017年10月 - 2018年10月   第19回キャビテーションに関するシンポジウム   幹事
  • 2017年10月 - 2018年05月   第55回伝熱シンポジウム   実行委員(プログラム&OS担当)
  • 2016年01月 - 2018年01月   日本熱物性学会   評議員
  • 2015年04月 - 2017年03月   日本機械学会   P-SCC13:マイクロ熱流動に関する調査研究分科会 委員
  • 2014年04月 - 2017年03月   日本機械学会   校閲委員
  • 2015年04月 - 2016年03月   日本機械学会北海道支部   商議員 (支部会計委員兼務)
  • 2014年04月 - 2015年09月   日本機械学会   日本機械学会2015度年次大会 実行委員
  • 2014年07月 - 2015年03月   日本機械学会   日本機械学会北海道支部 学生委員
  • 2013年09月 - 2014年07月   日本混相流学会   混相流シンポジウム2014 実行委員 総務
  • 2012年01月 - 2014年01月   日本熱物性学会   評議員
  • 2011年04月 - 2013年03月   日本機械学会北海道支部   流体工学懇話会 幹事
  • 2011年04月 - 2013年03月   日本機械学会流体工学部門   広報委員
  • 2010年04月 - 2010年09月   日本流体力学会   日本流体力学会年会2010 Web幹事


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