Numerical Study of Heat Transfer Mechanism in Turbulent Supercritical CO2 Channel Flow

IMECH-IR > 力学所知识产出(1956-2008)

	Numerical Study of Heat Transfer Mechanism in Turbulent Supercritical CO2 Channel Flow
	Li XL(李新亮); Hashimoto K; Tominaga Y; Tanahashi M; Miyauchi T; Li XL
会议录名称	Journal Of Thermal Science And Technology
	2008
页码	112-123
会议名称	7th ASME/JSME Thermal Engineering Conference/Summer Heat Transfer Conference
会议日期	JUL 08-12, 2007
会议地点	Vancouver, CANADA
摘要	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.
关键词	Turbulent Heat Transfer Supercritical Flow Direct Numerical Simulation Turbulent Channel Flow Simulation Equation State
WOS记录号	WOS:000264829800013
收录类别	CPCI-S
语种	英语
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	会议论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/25364
专题	力学所知识产出(1956-2008)
通讯作者	Li XL
推荐引用方式 GB/T 7714	Li XL,Hashimoto K,Tominaga Y,et al. Numerical Study of Heat Transfer Mechanism in Turbulent Supercritical CO2 Channel Flow[C]Journal Of Thermal Science And Technology,2008:112-123.

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