Diffusion and mass transfer from a rotating disk in aqueous polymeric solutions

Abstract

Laminar flow mass transfer data from the surface of rotating disks have been used to calculate diffusion coefficients of benzoic acid in aq. solutions of carboxymethyl cellulose (CMC). In the range studied the diffusion coefficient has been shown to decrease with increasing polymer concentration and to be independent of shear rate. The ratio of the diffusivity in polymer solution to that in water is a function of the square root of the polymer concentration and for benzoic acid-aq. CMC solution it can be expressed as DM,sol DM,water=10-0.964 C. © 1980.