The effect of chemical reaction on the unsteady dispersion of solute in blood flow through a pipe and a channel between two parallel plates is analyzed mathematically, treating the blood as Casson fluid. Generalized dispersion model is applied to solve the convective-diffusion equation. It is seen that the dispersion function at steady state and relative axial diffusivity decrease with the increase of chemical reaction rate while the reverse behavior is shown by dispersion function at unsteady state. The dispersion function increases with the increase of yield stress at the center. The dispersion function is considerably higher when the solute disperses in channel flow than in pipe flow and the reverse behavior is depicted by the relative axial diffusivity.

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