Numerical Study of Heat Transfer Mechanism in Turbulent Supercritical CO2 Channel Flow
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概要
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Direct numerical simulation (DNS) of supercritical CO2 turbulent channel flow has been performed to investigate the heat transfer mechanism of supercritical fluid. In the present DNS, full compressible Navier-Stokes equations and Peng-Robison state equation are solved. Due to effects of the mean density variation in the wall normal direction, mean velocity in the cooling region becomes high compared with that in the heating region. The mean width between high- and low-speed streaks near the wall decreases in the cooling region, which means that turbulence in the cooling region is enhanced and lots of fine scale eddies are created due to the local high Reynolds number effects. From the turbulent kinetic energy budget, it is found that compressibility effects related with pressure fluctuation and dilatation of velocity fluctuation can be ignored even for supercritical condition. However, the effect of density fluctuation on turbulent kinetic energy cannot be ignored. In the cooling region, low kinematic viscosity and high thermal conductivity in the low speed streaks modify fine scale structure and turbulent transport of temperature, which results in high Nusselt number in the cooling condition of the supercritical CO2.
- 一般社団法人日本機械学会・社団法人日本伝熱学会の論文
著者
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Miyauchi Toshio
Department Of Mechanical And Aerospace Engineering Tokyo Institute Of Technology
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Tanahashi Mamoru
Department Of Mechanical And Aerospace Engineering Tokyo Institute Of Technology
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TOMINAGA Yasuhiro
Department of Orthopedics and Rehabilitation, Yale University School of Medicine
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HASHIMOTO Katsumi
Central Research Institute of Electric Power Industry
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LI Xinliang
Department of Mechanical and Aerospace Engineering, Tokyo Institute of Technology
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TOMINAGA Yasuhiro
Department of Mechanical and Aerospace Engineering, Tokyo Institute of Technology
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