FORMULATION OF 2-DIMENSIONAL RADIANT HEAT FLUX FOR ABSORBING-EMITTING PLANE LAYER WITH NONISOTHERMAL BOUNDING WALLS

Two-dimensional approximate formulation for the radiant heat flux and its divergence is developed for the case of an absorbing- emitting medium bounded by nonisothermal parallel plates. For the optically thin limit, the present analysis approaches the rigorous exact solution. The formulation is believed to be simple enough to be useful for a variety of practical problems of radiative equilibrium and combined condution-convenction and radiation pertaining to the geometry and boundary conditions of this model. The applicability of this formulation and the '%'two- dimensionality'%' effects are demonstrated for the case of radiative equilibrium in the presence of gray gas of constant properties.