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ISSN Online: 2377-424X

International Heat Transfer Conference 5
September, 3-7, 1974, Tokyo, Japan

AXISYMMETRIC NATURAL CONVECTION FLOWS RESULTING FROM THE COMBINED BUOYANCY EFFECTS OF THERMAL AND MASS DIFFUSION

Get access (open in a dialog) DOI: 10.1615/IHTC5.810
pages 10-14

Sinopsis

This paper considers the steady, laminar flows which arise due to the simultaneous diffusion of heat and chemical species in axisymmetric flows. The boundary layer equations are shown to have solutions of similarity form for combined buoyancy effects for both power-law and exponential axial temperature variation. The resulting similarity equations are of the same form as for the purely thermal point source plume. Detailed consideration is given to the power-law variation which corresponds to flow with a constant plume convection rate of thermal energy and of diffusing species, both from a common point source, with small levels of species concentration. The equations are numerically integrated for a range of Prandtl, Lewis and mass diffusion parameter, for aiding and opposing buoyancy effects. Closed-form solutions are presented for particular values of these parameters. The results show many interesting effects on velocity, temperature and concentration profiles, and expressions are given for the total mass and momentum convection rate in terms of the various numerical results.