TY - JOUR
T1 - Local energy dissipation rate balances local heat flux in the center of turbulent thermal convection
AU - Ni, Rui
AU - Huang, Shi Di
AU - Xia, Ke Qing
PY - 2011/10/17
Y1 - 2011/10/17
N2 - The local kinetic energy dissipation rate u,c in Rayleigh-Bénard convection cell was measured experimentally using the particle tracking velocimetry method, with varying Rayleigh number Ra, Prandtl number Pr, and cell height H. It is found that u,c/(κ3H -4)=1.05×10-4Ra1.55±0.02Pr1. 15±0.38. The Ra and H dependencies of the measured results are found to be consistent with the assumption made for the bulk energy dissipation rate u,bulk in the Grossmann-Lohse model. A remarkable finding of the study is that u,c balances the directly measured local Nusselt number Nuc in the cell center, not only scalingwise but also in magnitude.
AB - The local kinetic energy dissipation rate u,c in Rayleigh-Bénard convection cell was measured experimentally using the particle tracking velocimetry method, with varying Rayleigh number Ra, Prandtl number Pr, and cell height H. It is found that u,c/(κ3H -4)=1.05×10-4Ra1.55±0.02Pr1. 15±0.38. The Ra and H dependencies of the measured results are found to be consistent with the assumption made for the bulk energy dissipation rate u,bulk in the Grossmann-Lohse model. A remarkable finding of the study is that u,c balances the directly measured local Nusselt number Nuc in the cell center, not only scalingwise but also in magnitude.
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U2 - 10.1103/PhysRevLett.107.174503
DO - 10.1103/PhysRevLett.107.174503
M3 - Article
C2 - 22107524
AN - SCOPUS:80054721172
SN - 0031-9007
VL - 107
JO - Physical Review Letters
JF - Physical Review Letters
IS - 17
M1 - 174503
ER -