Buoyancy Assisted and Opposed Combined Mixed Convection-Radiation Heat Transfer in a Vertical Parallel Plate

The present work encompasses an analysis of combined (radiative and convective) mixed (free and forced convective) heat transfer within a vertical parallel plate under the influence of buoyancy assisted and opposed flows. Radiative heat transfer between the two opposite walls is considered and the gas is assumed to be gray and the medium is radiatively participating. Momentum equations are solved by the finite volume-based finite difference technique and the radiative transfer equation (RTE) is solved by using the discrete ordinates method (DOM). The main objective is to investigate the influence of buoyancy aided/opposed force and thermal radiation on the mixed convective flow in a vertical parallel plate. The results are presented as the profiles of velocity and temperature distributions across the channel, streamlines, fanning friction oefficient, total wall heat fluxes and bulk temperature for both assisted and opposed flows with and without the presence of radiation heat transfer. The absolute amount of fanning friction coefficient reduces for the both assisted and opposed flow conditions while radiation mode is considered. Results show that for the buoyancy opposed flow, the overall rate of heat transfer between the walls and medium is higher than the buoyancy assisted case.

Keywords:

combined mixed convection-radiation heattransfer , assisted/opposed flow , finite volume method , DOM