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LES of Mixed Convection Boundary Layer Between Radiating Parallel Plates

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.1100
pages 527-530

D. G. Barhaghi
Division of Fluid Dynamics, Department of Applied Mechanics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden

Lars Davidson
Division of Thermo and Fluid Dynamics, Department of Applied Mechanics, Department of Mechanical Engineering, Chalmers University of Technology, Hörsalvagen 7b, SE41296 Göteborg, Sweden

Abstract

The influence of natural convection on a mixed convection boundary layer in a vertical channel is studied using Large-eddy simulation. A constant heat flux boundary condition is applied to one of the channel walls while the other wall is insulated. The Grashof and Reynolds numbers based on the wall heat flux and the channel width are Gr = 9.4 · 107 and Re = 5080. As the temperature difference between the hot wall and the inlet air is large, the governing equations are solved using two different approaches namely Boussinesq approximation considering constant properties and the equations with variable properties. As a consequence of hot wall high temperature, radiation is also taken into account and it is shown that about 10% of the heat is transferred via radiation. Although variable property equations yield better solutions compared to the constant property equations, there exist substantial differences between the computed and the measured profiles which might be due to the numerical scheme that has impaired the imposed turbulence at the inlet.

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