Abstract
The paper is concerned with the dispersion of a solute in combined free and forced convective flow through a channel in the presence of uniform axial temperature variation along the walls. Using a generalised dispersion model, we have evaluated the longitudinal diffusion coefficients which are valid for all time after the injection of the slug in the flow. When both Grashof number and time are small, the dispersion coefficient increases very rapidly with Grashof number whereas it increases very slowly with time but after certain lapse of time it increases and levels off quickly to the asymptotic value for large time. Further for large Grashof number, the dispersion coefficient is practically independent of time and the above results are valid for both heating and cooling of the plate.
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