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

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	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
	2008
会议名称	7th ASME/JSME Thermal Engineering Conference/Summer Heat Transfer Conference
会议日期	JUL 08-12, 2007
通讯作者邮箱	mtanahas@mes.titech.ac.jp
会议地点	Vancouver, CANADA
关键词	Turbulent Heat Transfer Supercritical Flow Direct Numerical Simulation Turbulent Channel Flow Simulation Equation State
页码	112-123
通讯作者	Li XL
中文摘要	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.
收录类别	CPCI-S
会议录	Journal Of Thermal Science And Technology
会议录出版者	Tokyo
会议录出版地	Japan Soc Mechanical Engineers
语种	英语
WOS记录号	WOS:000264829800013
内容类型	会议论文
源URL	[http://dspace.imech.ac.cn/handle/311007/25364]
专题	力学研究所_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]. 见:7th ASME/JSME Thermal Engineering Conference/Summer Heat Transfer Conference. Vancouver, CANADA. JUL 08-12, 2007.