TY - JOUR
TI - Forced convection of radiating gas over an inclined backward facing step using the blocked-off method
AU - Ansari Amir Babak
AU - Gandjalikhan Nassab Seyyed Abdolreza
JN - Thermal Science
PY - 2013
VL - 17
IS - 3
SP - 773
EP - 786
PT - Article
AB - The present work investigates the laminar forced convection flow of a  radiating gas over an inclined backward facing step (BFS) in a horizontal  duct. The momentum and energy equations are solved numerically by the CFD  techniques to obtain the velocity and temperature fields. Since, the  twodimensional Cartesian coordinate system is used to solve the governing  equations; the flow over inclined surface is simulated by considering the  blocked-off region in regular grid. Discretized forms of the governing  equations in the (x,y) plane are obtained by the control volume method and  solved using the SIMPLE algorithm. The fluid is treated as a gray,  absorbing, emitting and scattering medium. Therefore, all of the convection,  conduction and radiation heat transfer mechanisms take place simultaneously  in the gas flow. For computation of the radiative term in the gas energy  equation, the radiative transfer equation (RTE) is solved numerically by the  discrete ordinates method (DOM) to find the radiative heat flux distribution  inside the radiating medium. In the numerical results, effects of  inclination angle, optical thickness, scattering albedo and the  radiation-conduction parameter on the heat transfer behavior of the  convection flow are investigated. This research work is a new one in which a  combined convection-radiation thermal system with a complex flow geometry is  simulate by efficient numerical techniques.