TED-AJ03-545 CONJUGATE HEAT TRANSFER IN OPEN SHALLOW CAVITIES : A NUMERICAL EXPERIMENT

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A numerical study has been carried out on open shallow cavities, which are formed by a wall facing the opening and two horizontal walls adjoining it. Constant heat flux is applied on the wall facing the opening, the outside surface of which is isothermal while the outside surfaces of horizontal walls are assumed to be adiabatic. Heat flux is dissipated by natural convection of a fluid through the cavity and by conduction through the solid walls the ambient at a constant temperature. Conjugate heat transfer by natural convection and conduction is studied by numerically solving equations of mass, momentum and energy. The computation was done using : i) extended domain comprising the open cavity and extended field with appropriate boundary conditions and ii) restricted domain comprising the open cavity. Streamlines and isotherms are produced, heat and mass transfer are calculated. It is found that various boundary conditions used in the enlarged domain produced similar results in the open cavity, but with different execution times to obtain a steady solution. A parametric study was carried out using restricted computational domain, with governing parameters : Rayleigh number from (10)^6 to (10)^<12>, conductivity ratio from 1 to 60,cavity aspect ratio from 1 to 0.125,dimensionless end wall thickness from 0.05 to 0.20 and those horizontal from 0.01 to 0.15.
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