Turbulent Thermal Convection in an Enclosure With Internal Heat Generation

[+] Author and Article Information
B. Farouk

Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA 19104

J. Heat Transfer 110(1), 126-132 (Feb 01, 1988) (7 pages) doi:10.1115/1.3250442 History: Received November 11, 1986; Online October 20, 2009


Numerical results are presented for turbulent thermal convection, driven by uniform volumetric energy sources for two-dimensional flows in a rectangular enclosure. Rigid adiabatic sides and a rigid isothermal upper surface are considered. For the rigid bottom surface, zero heat flux boundary conditions are used. Computations are carried out for Prandtl number = 6.5 and Rayleigh number (based on enclosure depth L ) range of 106 to 1010 . The aspect ratio (L/X ) of the enclosure was maintained at 0.5 for all cases. The turbulence model used in this study is a k –ε model, which characterizes turbulence through the kinetic energy and its volumetric rate of dissipation. Buoyancy effects on the turbulence structure are accounted for. Results show the transition from well-ordered multicellular flow to fully turbulent flow within the enclosure as the Rayleigh number increases.

Copyright © 1988 by ASME
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