TY - JOUR
TI - Combined natural-convection and radiation in presence of internal heat generation source in absorbing-emitting-scattering medium
AU - Rachedi Nesrine
AU - Guellal Messaoud
AU - Bouafia Madiha
JN - Thermal Science
PY - 2023
VL - 27
IS - 2
SP - 1673
EP - 1685
PT - Article
AB - Numerical investigation of combined laminar natural convection and volumetric  radiation with internal heat generation is presented in this paper and  computations are performed for a grey gas-filled square cavity whose  horizontal walls are adiabatic and vertical walls are differentially heated.  The convection is treated under Boussinesq approximation by an approach  based on finite-volumes and the volumetric radiation by the discrete  ordinates method. Flow and heat transfer characteristics through isotherms,  streamlines and average Nusselt numbers have been presented for an external  Rayleigh number 106, internal Rayleigh number 0 to 4x1012, optical thickness 0 to  10 and Albedo 0 to 1. Representative results illustrating the effects of the  optical thickness and the internal heat generation on the flow and the  temperature distribution within the cavity are presented. The results reveal  that the fluid flow and heat transfer are influenced significantly by the  volumetric radiation and the internal heat generation. By comparing the  solutions in pure convection, the results in combined convection-volumetric  radiation show that when the medium is participating, the effect of internal  source presence is very important.