Direct numerical simulation (DNS) of supercritical CO2 turbulent channel flow is 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.
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ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference
July 8–12, 2007
Vancouver, British Columbia, Canada
Conference Sponsors:
- Heat Transfer Division
ISBN:
0-7918-4274-6
PROCEEDINGS PAPER
Numerical Study of Heat Transfer Mechanism in Turbulent Supercritical CO2 Channel Flow Available to Purchase
Xinliang Li,
Xinliang Li
Tokyo Institute of Technology, Tokyo, Japan
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Katsumi Hashimoto,
Katsumi Hashimoto
Central Research Institute of Electric Power Industry, Yokosuka, Kanagawa, Japan
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Mamoru Tanahashi,
Mamoru Tanahashi
Tokyo Institute of Technology, Tokyo, Japan
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Toshio Miyauchi
Toshio Miyauchi
Tokyo Institute of Technology, Tokyo, Japan
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Xinliang Li
Tokyo Institute of Technology, Tokyo, Japan
Katsumi Hashimoto
Central Research Institute of Electric Power Industry, Yokosuka, Kanagawa, Japan
Mamoru Tanahashi
Tokyo Institute of Technology, Tokyo, Japan
Toshio Miyauchi
Tokyo Institute of Technology, Tokyo, Japan
Paper No:
HT2007-32739, pp. 247-256; 10 pages
Published Online:
August 24, 2009
Citation
Li, X, Hashimoto, K, Tanahashi, M, & Miyauchi, T. "Numerical Study of Heat Transfer Mechanism in Turbulent Supercritical CO2 Channel Flow." Proceedings of the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 1. Vancouver, British Columbia, Canada. July 8–12, 2007. pp. 247-256. ASME. https://doi.org/10.1115/HT2007-32739
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