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	Convection heat transfer of CO2 at supercritical pressures in a vertical mini tube at relatively low reynolds numbers
	Jiang, Pei-Xue ; Zhang, Yu ; Zhao, Chen-Ru ; Shi, Run-Fu
	2010-05-11 ; 2010-05-11
关键词	convection heat transfer supercritical pressures CO2 mini-tube experiments numerical simulation buoyancy flow acceleration relatively low reynolds numbers CARBON-DIOXIDE FLOW TEMPERATURE VELOCITY Thermodynamics Engineering, Mechanical Physics, Fluids & Plasmas
中文摘要	Convection heat transfer of CO2 at supercritical pressures in a 0.27 mm diameter vertical mini tube was investigated experimentally and numerically for upward and downward flows at relatively low inlet Reynolds numbers (2900 and 1900). The effects of inlet temperature, pressure, mass flow rate, heat flux, flow direction, buoyancy and flow acceleration on the convection heat transfer were investigated. For inlet Reynolds numbers less than 2.9 x 103, the local wall temperature varies non-linearly for both flow directions at high heat fluxes (113 kW/m(2)). For the mini tube used in the current study, the buoyancy effect is normally low even when the heating is relatively strong, while the flow acceleration due to heating can strongly influence the turbulence and reduce the heat transfer for high heat fluxes. For relatively low Reynolds numbers (Re-in <= 2.9 x 10(3)) and the low heat flux (30.0 kW/m(2)) the predicted values using the LB low Reynolds number correspond well with the measured data. However, for the high heat flux (113 kW/m2), the predicted values do not correspond well with the measured data due to the influence of the flow acceleration on the turbulence. (C) 2008 Elsevier Inc. All rights reserved.
语种	英语 ; 英语
出版者	ELSEVIER SCIENCE INC ; NEW YORK ; 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/25874]
专题	清华大学
推荐引用方式 GB/T 7714	Jiang, Pei-Xue,Zhang, Yu,Zhao, Chen-Ru,et al. Convection heat transfer of CO2 at supercritical pressures in a vertical mini tube at relatively low reynolds numbers[J],2010, 2010.
APA	Jiang, Pei-Xue,Zhang, Yu,Zhao, Chen-Ru,&Shi, Run-Fu.(2010).Convection heat transfer of CO2 at supercritical pressures in a vertical mini tube at relatively low reynolds numbers..
MLA	Jiang, Pei-Xue,et al."Convection heat transfer of CO2 at supercritical pressures in a vertical mini tube at relatively low reynolds numbers".(2010).

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