Effect of baffle length on mixed convection coupled to surface radiation in a rectangle cavity

Abstract

In this study, we numerically investigated the influence of the baffle length and emissivity of the walls on heat transfer in a mixed convection coupled with radiation in a rectangular cavity ventilated. The baffle length is used Lb = 0.3, 0.5 and 0.7. The cavity walls are gray. The left vertical wall is heated to a constant heat flux and the other walls are adiabatic. The finite volume method is used to solve the governing equations. At the input of the cavity whose opening height w =H/10, the fluid velocity is determined from the number of Reynolds Re between 50 and 500. The Grashof number Gris fixed to 104 and the Prandtl number Pr is kept constant 0.71. The results obtained in this study show that the heat transfer enhancement depends on the increase in emissivity; However, the increase in total Nusselt number NuT depends on the increase of the baffle length.

Keywords

• numerical study
• mixed convection
• baffle
• wall emissivity