scholarly journals Turbulent Rayleigh-Bénard convection of compressed gas: effect of sidewall thermal conductance

2022 ◽  
Vol 182 ◽  
pp. 121965
Author(s):  
V. Srinivasan ◽  
U. Madanan ◽  
R.J. Goldstein
Keyword(s):  
Thermal Conductance ◽  
Bénard Convection ◽  
Benard Convection ◽  
Compressed Gas ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard ◽  
Gas Effect

Effect of Sidewall Conductance on Nusselt Number for Rayleigh-Bénard Convection: A Semi-Analytical and Experimental Correction

2019 ◽  
Vol 141 (12) ◽  
Author(s):  
U. Madanan ◽  
R. J. Goldstein
Keyword(s):  
Thermal Conductivity ◽  
Nusselt Number ◽  
Analytical Model ◽  
Thermal Conductance ◽  
Bénard Convection ◽  
Benard Convection ◽  
Extended Surfaces ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard ◽  
Good Agreement

Abstract The effect of sidewall conductance on Nusselt number for the Rayleigh-Bénard convection is examined by performing nearly identical sets of experiments with sidewalls made of three different materials. These experimental results are utilized to extrapolate and estimate the Nusselt number for an ideal zero-thermal-conductivity sidewall case, which is the case when the sidewalls are perfectly insulating. A semi-analytical model is proposed, based on the concept of extended surfaces, to compute the discrepancy in Nusselt number caused by the presence of finite thermal conductance of the sidewalls. The predictions obtained using this model are found to be in good agreement with the corresponding experimentally determined values.

scholarly journals ABOUT SPECIFIC FEATURES OF CONVECTION IN COMPRESSED GAS

2021 ◽  
Vol 8 ◽  
pp. 288-299
Author(s):  
Igor B. Palymskiy ◽  
Artem V. Trilis
Keyword(s):  
Numerical Simulation ◽  
Temperature Gradient ◽  
Stable Stratification ◽  
Heat Conducting ◽  
Convection Regime ◽  
Bénard Convection ◽  
Benard Convection ◽  
Compressed Gas ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard

Stability characteristics of static Rayleigh - Benard convection regime in a compressible, viscous and heat-conducting gas are investigated by means of numerical simulation. It is shown that, depending on the height of convection region and the magnitude of temperature gradient, various convection modes are realized - isobaric, adiabatic, and superadiabatic. The conditions under which convection develops at stable stratification are determined. A diagram of convection modes is plotted depending on the height of the region and the magnitude of temperature gradient.

The -dependence of the critical roughness height in two-dimensional turbulent Rayleigh–Bénard convection

2021 ◽  
Vol 911 ◽  
Author(s):  
Jian-Lin Yang ◽  
Yi-Zhao Zhang ◽  
Tian-cheng Jin ◽  
Yu-Hong Dong ◽  
Bo-Fu Wang ◽  
...  
Keyword(s):  
Roughness Height ◽  
Two Dimensional ◽  
Bénard Convection ◽  
Benard Convection ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard

Abstract

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