A phenomenological model of eddy heat transport in natural convection with volumetric energy sources at high Rayleigh numbers is developed in this study. The model is applied to the problem of thermal convection in a horizontal heated fluid layer with an adiabatic lower boundary and an isothermal upper wall. A correlation for mean Nusselt numbers is obtained for steady heat transfer. Distributions of the mean turbulent temperature, the eddy heat flux, and production of thermal variance in the heated fluid are presented. The mechanism of turbulent thermal convection at high Rayleigh numbers is discussed. Comparison is made with existing experiments and found to be good.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanical Engineering
- Fluid Flow and Transfer Processes