On the centrifugal effect in turbulent rotating thermal convection: onset and heat transport

Hu, Yun-Bing1,2; Xie, Yi-Chao3,4; Xia, Ke-Qing1

2022-03-21

10.1017/jfm.2022.190

JOURNAL OF FLUID MECHANICS   影响因子和分区

0022-1120

1469-7645

The effect of centrifugal force in turbulent rotating Rayleigh-Benard convection (RRBC) is studied experimentally in an aspect-ratio Gamma = 1 cylindrical convection cell and in the ranges of the Froude number 0.004 <= Fr <= 0.363 and the Rayleigh number 2.8 x 10(8) <= Ra <= 9.5 x 10(9), and with the Prandtl number fixed at Pr = 4.34. We use the bulk temperature anomaly to determine the onset Froude number Fr-c, beyond which the centrifugal effects cannot be regarded as insignificant. It is found that Fr, depends on Ra as Fr-c similar to Ra-0.53, which may be understood qualitatively by the idea of local force balance. For Fr > Fr-c, the centrifugal effect is more pronounced for smaller Ra, which is also found for larger constant 1/R-0. This implies that the response of the system to the centrifugal force depends on the flow states, which, in RRBC, is mainly determined by the competition between the buoyancy and Coriolis forces. Detailed analysis of the sidewall temperature signal shows results consistent with those obtained from the bulk temperature. Based on the above results, we propose a different division of the 1/R-0-Fr phase space than previously suggested. For the heat transport, the results under fixed 1/R-0 show well-defined Nu-Ra scalings, which can provide a better prediction for the heat transport when extrapolating to the unexplored regions in the phase space.

rotating turbulence turbulent convection Benard convection

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China (NSFC)[12072144] ; Research Grants Council of Hong Kong SAR["N_CUHK437/15","CUHK14302317"] ; NSFC funds[12002260,92152104]

Mechanics ; Physics

Mechanics ; Physics, Fluids & Plasmas

WOS:000771015100001

CAMBRIDGE UNIV PRESS

20221511960234

Froude number ; Natural convection ; Phase space methods ; Prandtl number

Fluid Flow, General:631.1 ; Heat Transfer:641.2 ; Mathematics:921 ; Physical Properties of Gases, Liquids and Solids:931.2

ENGINEERING

Web of Science

1.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Ctr Complex Flows & Soft Matter Res, Shenzhen 518055, Peoples R China
2.Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
3.Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Peoples R China
4.Xi An Jiao Tong Univ, Sch Aerosp, Xian 710049, Peoples R China

Hu, Yun-Bing,Xie, Yi-Chao,Xia, Ke-Qing. On the centrifugal effect in turbulent rotating thermal convection: onset and heat transport[J]. JOURNAL OF FLUID MECHANICS,2022,938.

Hu, Yun-Bing,Xie, Yi-Chao,&Xia, Ke-Qing.(2022).On the centrifugal effect in turbulent rotating thermal convection: onset and heat transport.JOURNAL OF FLUID MECHANICS,938.

Hu, Yun-Bing,et al."On the centrifugal effect in turbulent rotating thermal convection: onset and heat transport".JOURNAL OF FLUID MECHANICS 938(2022).