EFFECT OF SECONDARY FLOWS ON CONTAMINANT DISPERSION WITH WEAK BOUNDARY ABSORPTION

The present analysis brings out the interaction of curvature and a wea k wall absorption parameter on the dispersion process using Taylor ana lysis. A perturbation series solution has been obtained td find the va lues of the effective dispersion coefficient. The constraints imposed by the perturbation techniques have been removed using a numerical sch eme based on spectral method. Results are found to be applicable for a time at which the Taylor dispersion model holds. It has been observed that in the interphase transport of reactive contaminants the effecti ve dispersion coefficient is significantly different from that of Tayl or due to the wall absorption parameter. The results corresponding to the straight tube are verified with the published results, and those o btained from the perturbation and spectral techniques are found to be comparable. The restriction of the present analysis is confined to the effect of weak wail absorption under laminar flow conditions This res triction needs to be relaxed. For moderate or large values of the abso rption parameter a generalized dispersion model has to be resorted to. (C) 1997 by Elsevier Science Inc.