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	Buoyancy effects on coupled heat transfer of supercritical pressure co2 in horizontal semicircular channels
	Zhang, Haiyan; Guo, Jiangfeng1; Huai, Xiulan; Cui, Xinying; Cheng, Keyong
刊名	International journal of heat and mass transfer
	2019-05-01
卷号	134页码:437-449
关键词	Printed circuit heat exchanger (pche) Supercritical pressure co2 (s-co2) Heat transfer Buoyancy effect Entransy dissipation Secondary flow
ISSN号	0017-9310
DOI	10.1016/j.ijheatmasstransfer.2019.01.045
通讯作者	Guo, jiangfeng(gjf1200@126.com)
英文摘要	The buoyancy has great influence on the convective heat transfer of supercritical pressure fluids whose thermal properties change drastically near the pseudocritical point. thus, numerical investigations on the coupled heat transfer characteristics of supercritical pressure co2 (s-co2) in horizontal semicircular channels are conducted in the present study. the effect of the secondary flow induced by buoyancy on the local thermal performance is analyzed in detail, and the dimensionless number se, which represents the absolute vorticity flux in the main flow, is employed to describe the secondary flow and estimate the buoyancy effect. the numerical results show that the buoyancy effect gets smaller with the increase of the mass flow rate, and the heat transfer performance in the asymmetric flow is superior to that in symmetric flows at low mass flow rate. the buoyancy could significantly improve the thermal performance on the top wall but deteriorate that on the bottom wall in the hot side, which is exactly opposite in the cold side. the local wall heat transfer enhancement could be attributed to thinner thermal boundary layer due to the secondary flow, and the entransy dissipation theory could well explain the local heat transfer behavior. the criterion se/re gives better prediction for the buoyancy effect on both overall and local heat transfer than the existing ones. (c) 2019 elsevier ltd. all rights reserved.
WOS关键词	THERMAL-HYDRAULIC PERFORMANCE ; CARBON-DIOXIDE ; BRAYTON CYCLE ; MIXED CONVECTION ; STRAIGHT CHANNEL ; FLOW ; EXCHANGER ; OPTIMIZATION ; WATER ; PCHE
WOS研究方向	Thermodynamics ; Engineering ; Mechanics
WOS类目	Thermodynamics ; Engineering, Mechanical ; Mechanics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000462418300039
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2373500
专题	工程热物理研究所
通讯作者	Guo, Jiangfeng
作者单位	1.Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Haiyan,Guo, Jiangfeng,Huai, Xiulan,et al. Buoyancy effects on coupled heat transfer of supercritical pressure co2 in horizontal semicircular channels[J]. International journal of heat and mass transfer,2019,134:437-449.
APA	Zhang, Haiyan,Guo, Jiangfeng,Huai, Xiulan,Cui, Xinying,&Cheng, Keyong.(2019).Buoyancy effects on coupled heat transfer of supercritical pressure co2 in horizontal semicircular channels.International journal of heat and mass transfer,134,437-449.
MLA	Zhang, Haiyan,et al."Buoyancy effects on coupled heat transfer of supercritical pressure co2 in horizontal semicircular channels".International journal of heat and mass transfer 134(2019):437-449.

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