Numerical simulation of Rayleigh-Benard convection with supercritical carbon dioxide in a shallow cavity

被引：0

作者：

Zhou, Litao ^{[1
,2
]}

Xu, Hong ^{[3
]}

Zhang, Yaoli ^{[1
,2
]}

Hong, Gang ^{[1
,2
]}

机构：

[1] Xiamen Univ, Coll Energy, Xiamen, Fujian, Peoples R China

[2] Fujian Res Ctr Nucl Engn, Xiamen, Fujian, Peoples R China

[3] Huazhong Univ Sci & Technol, Sch Aerosp Engn, Dept Mech, Wuhan, Hubei, Peoples R China

来源：

FRONTIERS IN ENERGY RESEARCH | 2023年 / 10卷

关键词：

Rayleigh-Benard convection; supercritical carbon dioxide; flow patterns; heat transfer; numerical simulation; NATURAL-CONVECTION; HEAT-TRANSPORT; FLUID; LAYER; TEMPERATURE; ENCLOSURES; STABILITY; BOUNDARY;

D O I：

10.3389/fenrg.2022.1079219

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

A numerical simulation of Rayleigh-Benard convection with supercritical carbon dioxide is presented in this paper. A shallow cavity with an aspect ratio of 4 is selected as a container that is fully filled with supercritical carbon dioxide. The influences of the bottom heat flux on the flow stability, flow pattern evolution, and heat transfer ability of Rayleigh-Benard convection are analyzed. Meanwhile, the transient and steady-state fluid behaviors are obtained. The results show that the bottom heat flux plays a dominating role in the stability of the convection. A transition from stable evolution to significant oscillation is found with the increase of the heat flux. The flow pattern evolution also strongly relies on the heat flux. A four-cell structure to a six-cell structure transformation accompanied by the orderly multicellular flow is observed with increasing heat flux. In addition, the local Nusselt number on the bottom wall is strongly related to the cell structure in the cavity.

引用

页数：15

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