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.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)