Natural Convection in Heat Generating Oval Porous Enclosures: A Non-Darcian Model

✍ Scribed by Subrat Das; Ranjit Kumar Sahoo; Yos S. Morsi

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 682 KB
• Volume: 81
• Category: Article
• ISSN: 0008-4034
• DOI: 10.1002/cjce.5450810216

✦ Synopsis

Abstract

This paper presents a series of numerical simulations dealing with the problem of natural convection flows and associated heat transfer in an enclosure filled with a fluid‐saturated porous medium. The analysis is based on the finite element technique and incorporates the Brinkman‐extended Darcy model for an oval enclosure. The numerical results obtained for a modified Rayleigh number, Ra, Darcy number, Da, offset, E, and eccentricity, e, are presented and discussed. The numerical predictions for a square enclosure compared well with published data. It is found that any increase in Da or Ra results in a higher fluid velocity that is responsible for shifting the core of the flow. Moreover, at higher ovality (E = 0.5), asymmetric flow is observed even at the lower range of Rayleigh number (Ra ⩽ 20), which may be attributed to the effect of curved isothermal wall.