Mixed Convection and Thermal Radiation Heat Transfer in a Three Dimensional Vertical Channel

A numerical study of mixed convection (free and forced) together with thermal radiation heat transfer in a vertical square channel, considering all the radiation properties (emitting, scattering and absorbing), is carried out. The flow in the channel is assumed as laminar, steady and three dimensional. The opposite walls temperatures are considered to be different but constant. The governing equations include continuity, momentum, energy and radiative transfer equation and by solving them altogether, the velocity, pressure and temperature fields are determined. The SIMPLE algorithm with a staggered system is employed to solve the corresponding numerical equations formulated by the finite volume method and the discrete ordinates method, DOM, its 6 S scheme, is adopted for the radiation part. A fifth-order power law scheme is used to model the convection term and a suitable grid distribution is introduced. The main objective of present work is to evaluate the effects of radiation parameterssuch as conduction-radiation parameter and optical thickness on the heat transfer in the 3-D channel. The results are presented as the profiles of velocity and temperature across the width of channel displaying that the influence of these radiation parameters on the flow is considerable.

کلیدواژه ها:

mixed convection ، thermal radiation ، discrete ordinates method ، wall temperature ratio ، flowreversal