Heat transfer and flow structure in centrally-confined 2-D Rayleigh-Bénard convection

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外文摘要：Through direct numerical simulations,we investigated the flow structure and heat transfer of the centrally confined 2-D Rayleigh-Bénard(RB)convection over the Rayleigh number range 9×105 ≤ Ra ≤ 109 at a fixed Prandtl number Pr=4.3.It is found that with increasing Ra,the number of convection rolls in the central vertical channel increases from zero to three.When there is no rolls in the vertical channel,the convective flow in central region is significantly influenced by the boundary layer,whereas when the convection rolls is generated in the vertical channel,the convective flows in central regions is free from the boundary layer limitation,and by defining the characteristic length,one obtains the heat transfer scaling law relation in vertical channel,i.e.,Nuvc～Ra0.476±0005,which could be the evidence of"ultimate regime".

外文关键词：

Rayleigh-Bénard(RB)turbulenceheat transportvertical channelultimate regime

作者：

Cong Sun、Jian-zhao Wu、Xiao-hui Meng、Cai-xi Liu、Wei Xu、Yu-hong Dong、Quan Zhou

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作者单位：

Shanghai Institute of Applied Mathematics and Mechanics,School of Mechanics and Engineering Science,Shanghai Key Laboratory of Mechanics in Energy Engineering,Shanghai University,Shanghai 200072,China

China Electrical Equipment Group Research Institute of Science and Technology Co.Ltd.,Shanghai 200072,China

基金：

Natural Science Foundation of ChinaNatural Science Foundation of ChinaNatural Science Foundation of ChinaNatural Science Foundation of ChinaNatural Science Foundation of China

项目编号：

1198810292052201118252041210224612372220

出版年：

2024

DOI：

10.1007/s42241-024-0058-y

水动力学研究与进展B辑

中国船舶科学研究中心

水动力学研究与进展B辑

CSTPCDEI

影响因子：0.596

ISSN：1001-6058

年,卷(期)：2024.36(4)