D. Tsuneoka, J. Okajima Numerical simulation of two-phase flow in a microchannel for evaluating liquid film thickness and its Reynolds number dependency Journal of Fluid Science and Technology, Vol. 18, No. 3, p. JFST0029, 2023. (doi: 10.1299/jfst.2023jfst0029)
J. Okajima, M. Kato, A. Hayakawa, Y. Iga Investigation of bimodal characteristics of the droplet size distribution in condensation spray Scientific Reports, Vol. 13, No. 1, p. 12006, 2023. (doi: 10.1038/s41598-023-39087-5)
N. Yang, J. Okajima, Y. Iga Change in Cavitation Regime on NACA0015 Hydrofoil by Heating the Hydrofoil Surface Journal of Fluids Engineering, Vol. 145, No. 7, p. 071201, 2023. (doi: 10.1115/1.4057004)
Y. Iga, J. Okajima, Y. Yamagichi, H. Sasaki, Y. Ito Thermodynamic Suppression Effect of Cavitation Arising in a Hydrofoil in 140?°C Hot Water Journal of Fluids Engineering, Vol. 145, No. 1, p. 011207, 2023. (doi: 10.1115/1.4055600)
Y. Okubo, J. Okajima, Y. Iga Estimation of temperature inside unsteady cavitation in high-temperature water Journal of Fluid Science and Technology, Vol. 17, No. 3, p. JFST0008, 2022. (doi: 10.1299/jfst.2022jfst0008)
T. Okabe, K. Shirai, T. Okawa, J. Okajima, M. Shirota Phase diagram for the spreading behavior of water drops impacting hot walls observed via high-speed IR imaging Journal of Fluid Science and Technology, Vol. 17, No. 3, p. JFST0009, 2022. (doi: 10.1299/jfst.2022jfst0009)
Y. Iga, J. Okajima, Y. Yamaguchi, S. Hirotoshi, I. Yu Thermodynamic Suppression Effect of Cavitation Arising in a Hydrofoil in 140°C Hot Water Journal of Fluids Engineeringin press, 2022. (doi: 10.1115/1.4055600)
E. Dats, S. Minaev, V. Gubernov, J. Okajima The Normal Velocity of the Population Front in the “Predator?Prey” Model Mathematical Modelling of Natural Phenomena, Vol. 17, p. 36, 2022. (doi: 10.1051/mmnp/2022039)
J. Okajima, M. Ito, Y. Iga Experimental study of cavitating flow influenced by heat transfer from heated hydrofoil International Journal of Multiphase Flow, Vol. 155, p. 104168, 2022. (doi: 10.1016/j.ijmultiphaseflow.2022.104168)
Y. Iga, J. Okajima, S. Takahashi, Y. Ibata Occurrence characteristics of gaseous cavitation in oil shear flow Physics of Fluids, Vol. 34, No. 2, p. 023313, 2022. (doi: 10.1063/5.0075659)
V. M. Chudnovskii, M. A. Guzev, V. I. Yusupov, R. V. Fursenko, J. Okajima Study of methods for controlling direction and velocity of liquid jets formed during subcooled boiling International Journal of Heat and Mass Transfer, Vol. 173, p. 121250, 2021. (doi: 10.1016/j.ijheatmasstransfer.2021.121250)
R. V. Fursenko, V. M. Chudnovskii, S. S. Minaev, J. Okajima Mechanism of high velocity jet formation after a gas bubble collapse near the micro fiber immersed in a liquid International Journal of Heat and Mass Transfer, Vol. 163, p. 120420, 2020. (doi: 10.1016/j.ijheatmasstransfer.2020.120420)
J. Okajima, T. Okabe, N. Miyamoto, T. Morimoto, K. Tsunoda, N. Hatakeyama Experimental and numerical evaluation of temperature variation by frictional heating at the interface between snow and ski Journal of Biomechanical Science and Engineering, Vol. 15, No. 1, pp. 19-00507, 2020. (doi: 10.1299/jbse.19-00507)
Y. Nishimura, J. Okajima, T. Oouchi, A. Komiya Evaluation of forced convective boiling heat transfer with layered parallel microchannels Journal of Thermal Science and Technology, Vol. 15, No. 1, pp. 20-00019, 2020. (doi: 10.1299/jtst.2020jtst0006)
J. Okajima, P. Stephan Numerical simulation of liquid film formation and its heat transfer through vapor bubble expansion in a microchannel International Journal of Heat and Mass Transfer, Vol. 136, pp. 1241-1249, 2019. (doi: 10.1016/j.ijheatmasstransfer.2019.03.004)
A. D. Le, J. Okajima, Y. Iga Numerical simulation study of cavitation in liquefied hydrogen Cryogenics, Vol. 101, pp. 29-35, 2019. (doi: 10.1016/j.cryogenics.2019.04.010)
J. Okajima Generalized solution and estimation method for cooling performance of downscaled cryoprobe Journal of Thermal Biology, Vol. 82, pp. 213-221, 2019. (doi: 10.1016/j.jtherbio.2019.04.010)
A. D. Le, J. Okajima, Y. Iga Modification of Energy Equation for Homogeneous Cavitation Simulation With Thermodynamic Effect Journal of Fluids Engineering-Transactions of the ASME, Vol. 141, No. 8, pp. 081102-081102-081112, 2019. (doi: 10.1115/1.4042257)
J. Okajima, S. Jeong, S. Maruyama Evaluation of Cooling Performance of Ultrafine Cryoprobes: Effect of Probe Structure on Thermodynamic Properties of Refrigerant International Journal of Air-Conditioning and Refrigeration, Vol. 26, No. 2, p. 1850020, 2018. (doi: 10.1142/s2010132518500207)
Y. Takahashi, L. Chen, J. Okajima, Y. Iga, A. Komiya, W.-S. Fu, S. Maruyama Design and Feasibility Analysis of Microscale Bumped Channel with Supersonic Flow for Electronics Cooling Journal of Microelectromechanical Systems, Vol. 25, pp. 1033-1040, 2016. (doi: 10.1109/JMEMS.2016.2613942)
Y. Takahashi, L. Chen, J. Okajima, Y. Iga, A. Komiya, S. Maruyama Interferometric measurement and numerical comparisons of supersonic heat transfer flows in microchannel Applied Thermal Engineering, Vol. 109, pp. 582-590, 2016. (doi: 10.1016/j.applthermaleng.2016.08.108)
J. Okajima, A. Komiya, S. Maruyama 24-gauge ultrafine cryoprobe with diameter of 550μm and its cooling performance Cryobiology, Vol. 69, No. 3, pp. 411-418, 2014. (doi: 10.1016/j.cryobiol.2014.09.104)
J. Okajima, A. Komiya, S. Maruyama Experimental and Numerical Evaluation of Small-Scale Cryosurgery Using Ultrafine Cryoprobe Journal of Nanotechnology in Engineering and Medicine, Vol. 4, No. 4, p. 041009, 2014. (doi: 10.1115/1.4027988)
J. Okajima, A. Komiya, S. Maruyama Evaluation of Characteristics of Phase Change Heat Transfer in Ultrafine Cryoprobe Journal of Flow Control, Measurement & Visualization, Vol. 2, No. 2, pp. 55-66, 2014. (doi: 10.4236/jfcmv.2014.22008)
J. Okajima, A. Komiya, S. Maruyama Analysis of Evaporative Heat Transfer by Expansion Bubble in a Microchannel for High Heat Flux Cooling Journal of Thermal Science and Technology, Vol. 7, No. 4, pp. 740-752, 2012. (doi: 10.1299/jtst.7.740)
J. Okajima, A. Komiya, S. Maruyama Boiling heat transfer in small channel for development of ultrafine cryoprobe International Journal of Heat and Fluid Flow, Vol. 31, No. 6, pp. 1012-1018, 2010. (doi: 10.1016/j.ijheatfluidflow.2010.08.008)
J. Okajima, S. Maruyama, H. Takeda, A. Komiya Dimensionless solutions and general characteristics of bioheat transfer during thermal therapy Journal of Thermal Biology, Vol. 34, No. 8, pp. 377-384, 2009. (doi: 10.1016/j.jtherbio.2009.08.001)
F. Ono, J. Okajima Influence on Flow Velocity Variation on Heat Transfer of Subcooled Boiling in High Speed Flow the 20th International Conference on Flow Dynamics, Sendai International Center, Japan, 2023, 1275-1277.
H. Ishibashi, K. Ota, P. Stephan, J. Okajima Numerical Simulation of Bubble Shape and Heat Transfer During Nucleate Pool Boiling of FC-72 the 20th International Conference on Flow Dynamics, Sendai International Center, Japan, 2023, 1268-1270.
K. Ota, J. Okajima Numerical simulation of micro-layer formation during nucreate boiling of water the 33rd International Symposium on Transport Phenomena, Kumamoto, Japan, 2023,
S. Yanase, J. Okajima, K. Koseki Performance evaluation of porous cooling structure for top-heat oriented vapor chamber the 33rd International Symposium on Transport Phenomena, Kumamoto, Japan, 2023,
J. Okajima, P. Stephan Analysis on Characteristics of Dynamic Contact Angle Derived from Evaporative Moving Contact Line Model SWEP Workshop 2021, 2021.10.06 - 08, No. 13.
K. Sato, J. Okajima Experimental Study on Heat Transfer of Cavitating Flow in Heated Nozzle The 2nd Asian Conference on Thermal Sciences, 2021.10.03-2021.10.07, ACTS-1171.
J. Okajima, M. Ito, Y. Iga Influence of Heat Transfer from Heated NACA0015 Hydrofoil on Cavitating Flow 18th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Online, 2020.11.23-2020.11.26, ISROMAC2020-00019.
J. Okajima, R. V. Fursenko, S. Mokrin, V. Gubernov, S. Minaev Modeling on Boiling and Bubble Dynamics Induced by Laser Emitted from Optical Fiber Twentieth International Symposium on Advanced Fluid Information, 2020.10.28-2020.10.30, p. 127.
E. Dats, S. Minaev, J. Okajima, T. Miroshnichenko Sporadic Propagation of Spatiotemporal Patterns in a Plankton Model Twentieth International Symposium on Advanced Fluid Information, 2020.10.28-2020.10.30, pp. 123-124.
J. Okajima, P. Stephan Numerical Study of Effect of Vapor Bubble Behavior on Wetting Condition in Boiling Flow 72nd Annual Meeting of the APS Division of Fluid Dynamics, Seattle, USA, 2019.11.23-2019.11.26, H24.00009.
Y. Nishimura, J. Okajima, T. Oouchi, S. Masaru, A. Komiya Evaluation of Heat Transfer Performance of a Heat Sink with Microchannels of Different Diameters Sixteenth International Conference on Flow Dynamics, Sendai, Japan, 2019.11.06-2019.11.08, pp. 152-153.
N. Yang, S. Moriya, J. Okajima, T. Nomura, Y. Iga Visualization of Cavitation Behavior around the Fin in the Heat Exchanger Sixteenth International Conference on Flow Dynamics, Sendai, Japan, 2019.11.06-2019.11.08, pp. 776-777.
T. Hanyuda, J. Okajima, Y. Iga Development of Temperature Measurement System for Cavitation in High Temperature Water Sixteenth International Conference on Flow Dynamics, Sendai, Japan, 2019.11.06-2019.11.08, pp. 774-775.
A. D. Le, J. Okajima, Y. Iga Experimental and Numerical Study of Hot Water Cavitation on a NACA0015 Hydrofoil The 5th International Conference on Engineering Mechanics and Automation, Hanoi, Vietnam, 2019.10.11-2019.10.12
M. Ito, J. Okajima, Y. Iga Characteristics of the Cavitating flow on Heated Hydrofoil the 15th Asian International Conference on Fluid Machinery, Busan, Korea, 2019.09.25-2019.09.27, AICFM15-CA11-12.
M. Ito, J. Okajima, Y. Iga Investigation of Cavitating flow on a Heated Hydrofoil 10th International Conference on Multiphase Flow, Rio de Janeiro, Brazil, 2019.05.19-2019.05.24, OC.462.
M. Ito, J. Okajima, H. Sasaki, T. Nomura, Y. Iga Observation of Cavitating Flow on a Heated Hydrofoil Fifteenth International Conference on Flow Dynamics, Sendai, Japan, 2018.11.07-2018.11.09, pp. 898-899.
J. Okajima, A. Komiya Numerical Evaluation of Boiling Heat Transfer Performance in Isothermal Microchannels the 11th Australasian Heat and Mass Transfer Conference, Melbourne, Australia, 2018.07.09-2018.07.10, 11AHMTC18-22.
J. Okajima, P. Stephan Evaluation on evaporative heat transfer of expanding vapor bubble in microchannel by numerical simulation The 10th International Conference on Boiling and Condensation Heat Transfer, Nagasaki, Japan, 2018.03.12-2018.03.15, A361.
J. Okajima, T. Kogawa, A. Komiya, S. Maruyama Numerical Simulation of Temperature Distribution Control for Laser-induced Hyperthermia 14th International Conference on Flow Dynamics, Sendai, Japan, 2017.11.01-2017.11.03, pp. 332-333.
J. Okajima, T. Okabe, N. Miyamoto, T. Morimoto, N. Hatakeyama, K. Tsunoda, T. Sasaki, K. Kosugi, K. Ito, M. Suzuki, T. Shoji, S. Maruyama, A. Miyamoto, A. Isomura Accurate temperature measurement of interface between ski and snow surface for frictional heating evaluation 7th International Congress on Science and Skiing, St. Christoph am Arlberg, Austria, 2016.12.10-2016.12.14, pp. 56-57.
J. Okajima, P. Stephan Numerical simulation on expanding process of vapor bubble by evaporative heat transfer in microchannel The Fourth International Forum on Heat Transfer, Sendai, Japan, 2016.11.02-2016.11.04, IFHT2016-2025.
J. Okajima, P. Stephan Multiscale Effect in Near-Wall Evaporative Heat Transfer for High Heat Flux Cooling the Sixteenth International Symposium on Advanced Fluid Information, Sendai, Japan, 2016.10.10-2016.10.12, pp. 188-189.
J. Okajima, P. Stephan Numerical simulation of single bubble growth during flow boiling under reduced gravity 11th International Conference on Two-Phase Systems for Ground and Space Application, Marseille, France, 2016.09.26-2016.09.29, pp. 125-126.
Y. Takahashi, J. Okajima, Y. Iga, A. Komiya, S. Maruyama Measurement of Density Field of Supersonic Flow Inside a Micro-Channel by Phase Shifting Interferometer The 25th International Symposium on Transport Phenomena, Krabi, Thailand, 2014.11.05-2014.11.07, No.103.
J. Okajima, Y. Aizawa, K. Hou, P. Zehner, A. Komiya, S. Maruyama Numerical Investigation on Thermal and Hydrodynamical Behavior of Expanding Single Bubble in Microchannel The 25th International Symposium on Transport Phenomena, Krabi, Thailand, 2014.11.05-2014.11.07, No.110.
J. Okajima, T. Okabe, T. Sugiura, A. Komiya, T. Seki, S. Maruyama Estimation of blood perfusion rate and its temperature dependency in human abdominal area under heating condition The 15th International Heat Transfer Conference (IHTC-15), Kyoto, Japan, 2014.08.10-2014.08.15, IHTC15-9884.
J. Okajima, A. Komiya, S. Maruyama Experimental and Numerical Evaluation of Small-Scale Cryosurgery Using Ultrafine Cryoprobe ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer, Hong Kong, China, 2013.12.11-2013.12.14, MNHMT2013-22119.
J. Okajima, A. Komiya, S. Maruyama Evaluation on characteristics of phase change heat transfer in ultrafine cryoprobe the Twelfth International Symposium on Fluid Control, Measurements, and Visualization (FLUCOME 2013), Nara, Japan, 2013.11.18-2013.11.23, OS12-02-12.
J. Okajima, A. Komiya, S. Maruyama Development of Cryosurgical System in Small Region Utilizing Phased Change in a Microchannel The 8th KSME-JSME Thermal and Fluid Engineering Conference, Incheon, Korea, 2012.03.18-2012.03.21, FR04-002.
J. Okajima, A. Komiya, S. Maruyama Development of ultrafine cryoprobe for cryosurgery in small scale The 37th Annual Meeting of the Japan Society for Low Temperature Medicine, Tokyo, Japan, 2010.11.11, p. 35.
J. Okajima, A. Komiya, S. Maruyama The effect of capillary tube on cooling performance of ultrafine cryoprobe Seventh International Conference on Flow Dynamics, Sendai, Japan, 2010.11.01-2010.11.03, pp. 496-497.
J. Okajima, S. Maruyama, H. Takeda, A. Komiya, S. Jeong Cooling Characteristics of Ultrafine Cryoprobe Utilizing Convective Boiling Heat Transfer in Microchannel 14th International Heat Transfer Conference, Washington DC, USA, 2010.08.08-2010.08.13, pp. 297-306.
J. Okajima, S. Maruyama, A. Komiya Boiling heat transfer in small channel for development of ultrafine cryoprobe 7th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics, Krakow, Poland, 2009.06.28-2009.07.03, pp. 229-236.
J. Okajima, A. Komiya, S. Maruyama Determination Method of Concentration Dependency of Mass Diffusion Coefficient by Phase Shifting Interferometer and Inverse Method Fifth International Conference on Flow Dynamics, Sendai, Japan, 2008.11.17-2008.11.19, OS8-9.
J. Okajima, H. Takeda, A. Komiya, S. Maruyama Possibility of micro-cryosurgery utilizing cooling needle 16th International Conference on Mechanics in Medicine and Biology, Pittsburgh, USA, 2008.07.23-2008.07.25, 6B-2.
J. Okajima, S. Maruyama, A. Komiya Evaluation of the Relation between Frozen Regions and Heat Transfer Coefficient of Cooling Needle Fourth International Conference on Flow Dynamics Sendai, Japan, 2007.09.26, pp. 7-3.
J. Okajima, S. Maruyama, A. Komiya Analytical study of temperature distribution in biological tissue 15th International Conference on Mechanics in Medicine and Biology, Singapore, 2006.12.06-2006.12.08, pp. 403-406.
J. Okajima, S. Maruyama, A. Komiya Solution of bio-heat transfer equation during thermal therapies Third International Conference on Flow Dynamics, Sendai, Japan, 2006.11.07-2006.11.09, pp. 115-116.