Computation of combined natural-convection and radiation heat-transfer in a cavity having a square body at its center

A. Mezrhab, H. Bouali, H. Amaoui and M. Bouzidi

Applied Energy, 2006, vol. 83, issue 9, 1004-1023

Abstract: This paper describes a numerical study of the radiation-natural convection interactions in a differentially-heated cavity with an inner body. A specifically developed numerical model, based on the finite-volume method, is used for the solutions of the governing differential-equations. The SIMPLER algorithm for the pressure-velocity coupling is adopted. The fluid (air) is perfectly transparent to the radiation. The surface emissivity [epsilon], the Rayleigh number Ra, and the thermal conductivity ratio Rk were varied parametrically. For Pr = 0.71 and relatively wide ranges of the other parameters, results are reported in terms of isotherms, streamlines, average Nusselt-numbers across the enclosure, local Nusselt-numbers at the hot and cold walls, vertical and horizontal median velocities and horizontal walls, temperature distributions. It is found that: (i) the radiation exchange homogenizes the temperature inside the cavity and produces an increase in the average Nusselt-number, particularly when Rk and Ra are high and (ii) the average Nusselt-number increases with increasing surface emissivity, especially at high Rayleigh numbers.

Keywords: Natural; convection; Surface; radiation; Square; cavity; Inner; body (search for similar items in EconPapers)
Date: 2006
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Citations: View citations in EconPapers (5)

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