Surface convection and refractive index effects are examined during transient radiative heating or cooling of a grey semitransparent conducting layer of plastic with internal absorption, emission and scattering. Emission within the layer and internal reflections depend on the layer refractive index. The reflected energy and heat conduction distribute energy across the layer partially equalize the transient temperature distributions. The two -flux method is used to solve the energy equation to obtain transient solutions. The layer is initially at uniform and is heated or cooled by external radiation and convection. The two-flux equations were examined as a means for evaluating the radiative flux gradient in transient energy equation. Illustrative results obtained with the two flux method demonstrate the effect of isotropic scattering coupled with changing the refractive index.
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