Abstract
Abstract The paper presents an exact analysis of unsteady convective dispersion of a solute in a Casson fluid (assumed as the non-Newtonian behaviour of blood) flowing in a tube. Using a generalized dispersion model, which is valid for all time after the injection of the solute in the flow, we evaluate the axial dispersion coefficients as functions of time. The variation of the asymptotic dispersion coefficient K 2* with y 0 (the dimensionless radius of the plug flow region) shows that K 2* first increases with y 0, reaches a maximum and then decreases. The behaviour of the dimensionless dispersion coefficient K 2(T) − Pe −2 with time T is also shown graphically.
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