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PRANDTL NUMBER EFFECTS ON VERTICAL WALL JETS IN FORCED CONVECTION REGIME

DOI: 10.1615/ICHMT.2008.CHT.1410
10 pages

Ameni Mokni
Unité de Thermique et Environnement, Ecole Nationale d'Ingénieurs de Monastir, Route de Ouardanine 5000, MONASTIR, TUNISIE

Jamel Kechiche
Unité de Thermique et Environnement, Ecole Nationale d'Ingénieurs de Monastir, Route de Ouardanine 5000, MONASTIR, TUNISIE

Hatem Mhiri
Unité de Thermique et Environnement, Ecole Nationale d'Ingénieurs de Monastir, Route de Ouardanine 5000, MONASTIR, TUNISIE

Georges Le Palec


Philippe Bournot
IUSTI UMR CNRS 6595, Technopole de Chateau-Gombert, 5 rue Enrico Fermi, 13013 Marseille Cedex 20 - France

Abstract

This paper is a numerical investigation of a laminar isothermal plane two dimensional wall jet. Special attention has been paid to the effect of the inlet conditions at the nozzle exit on the hydrodynamic and thermal characteristics of the flow. The behaviour of various fluids evolving in forced convection near a vertical plate plane is carried out.
The system of governing equations is solved with an implicit finite difference scheme. For numerical stability we use a staggered non uniform grid. The obtained results show, that the effect of the Prandtl number is significant in the plume region in which the jet flow is governed by buoyant forces; Further for ascending X values, the buoyancy forces become dominating, and a certain agreement between the temperature profiles are observed, which shows that the velocity profile have no longer influence on the wall temperature evolution in this region. The fluids with low Prandtl number warm up more importantly, because for such fluids the effect of heat diffusion is higher.

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