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ISSN Online: 2377-424X

International Heat Transfer Conference 4
August 31 - September 5, 1970, Paris-Versailles, France

LAMINAR NATURAL CONVECTION IN A RECTANGULAR ENCLOSURE WITH MODERATELY LARGE TEMPERATURE DIFFERENCES

Get access (open in a dialog) DOI: 10.1615/IHTC4.3530
pages 1-11

Sinopsis

The variable property equations governing natural convection in a rectangular enclosure with a horizontal temperature gradient are expanded in terms of a density difference parameter and the resulting zeroth (Boussinesq) and first order sets of equations are solved by finite difference techniques for Ra ≤ 6 × 104 , Pr = 0.7 and 6.0 and aspect ratio, L, of 1.0 and 2.0. It is shown that in gases density variations are of the same importance as transport property variations in modifying the flow field while the thermal field remains less effected. In liquids both viscosity and conductivity influence the thermal field while the flow field is altered primarily by viscosity variations. The average Nusselt number remains unchanged when first order effects are included.