Author(s)

J. Orfi, N. Galanis & S. Ben Nasrallah

Abstract

Buoyancy effects of heat and mass transfer in developing laminar flow in a horizontal pipe J. Orfi* , N. Galanis^ & S. Ben Nasrallah^ * Faculte des Sciences de Monastir, Universite du centre, Tunisia * Faculte de genie, Universite de Sherbrooke, Canada *Ecole Nationale d'Ingenieurs de Monastir, Universite du centre,Tunisia Abstract Laminar mixed convection in a pipe with buoyancy due to thermal and/or concentration gradients has been studied numerically for uniform heat flux and concentration conditions at the interface. The results, for equal thermal and mass diffusion Grashof numbers, show that the flow field is very different from those corresponding to both forced convection and thermal mixed convection. The effects of solutal buoyancy predominate near the inlet while those of thermal origin determine the flow field far downstream. 1 Introduction There are many processes in which fluid flow occurs in the presence of temperature and/or concentration gradients : evaporatio

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