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COMBINED BUOYANCY EFFECTS OF THERMAL AND MASS DIFFUSION ON LAMINAR CONVECTION IN A VERTICAL ISOTHERMAL CHANNEL

DOI: 10.1615/ICHMT.2008.CHT.2130
14 pages

Othmane Oulaid
LMFE, Physics Department, Faculty of Sciences Semlalia, PO Box : 2390, Marrakech 40 001, Morocco; and THERMAUS, Département de génie mécanique, Université de Sherbrooke, Sherbrooke J1K 2R1, Québec, Canada

Nicolas Galanis
THERMAUS, Département de génie mécanique, Université de Sherbrooke, Sherbrooke J1K 2R1, Quèbec, Canada

Abstract

This paper deals with a numerical study of laminar mixed convection flow associated with phase change mass transfer in a vertical parallel plates channel. The plates are wetted by thin liquid water films and maintained at a constant temperature lower than that of the air entering the channel. The solution of the governing equations is based on the finite volume method with the well-known SIMPLER algorithm for handling the velocity-pressure coupling. Numerical results show that buoyancy forces have an important effect on hydrodynamic field as well as heat and mass transfer characteristics. These forces induce a flow reversal. Additionally, heat transfer associated with phase change (i.e. latent heat transfer) is more important compared with sensible heat transfer.

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