Radiative and convective heat transfer in a bidimensional channel with uniform wall heat flux

ABSTRACT The purpose of this study is to examine heat transfer by combined forced convection and thermal radiation for thermally developing flow in a bidimensional channel formed by two parallel plates. The flowing gas is an incompressible, absorbing, emitting, isotropically scattering gray medium. Axial conduction is considered for the duct walls, which are assumed to be gray and diffuse. The uniform wall heat flux boundary condition is considered and the heating of the gas is analysed. Governing equations are solved by the finite volume method (FVM), by using an iterative procedure. The influence of main parameters, such as optical thickness, scattering albedo, wall emissivity and wall conduction-radiation parameter, are investigated with reference to gas and wall temperatures. Radiative losses through the inlet and outlet sections of the channel are also evaluated.