Transient Coupled Radiation and Conduction Heat Transfer in a Scattering Layer of ARLEN

Abstract

ARLEN is a heat-resistant, modified polyamide with a high melting point and a rigidity level comparable to super engineering plastics. It possesses strong dimensional stability and is widely used in engineering and high-temperature applications. At elevated temperatures, radiative transfer becomes important, and transient temperature responses, including radiation, can be significantly different from those by conduction alone. This work considers transient radiative and conductive heat transfer in a plane, absorbing, emitting and isotropically scattering layer of ARLEN. The solution includes the radiative two-flux equation, which is coupled with the transient energy equation, and both equations are solved simultaneously. The two-flux method is used as a simplification for obtaining the radiative heat source term in the energy equation. The external boundaries of the layer are exposed to a radiative environment and can be convectively heated or cooled.