The film theory was used to determine the mass transfer coefficient for the
cross-flow filtration of guar gum solutions. We investigated:their variati
on with cross-flow velocity and concentration, Comparing the experimental r
esults with the Sherwood correlation generalized for power law fluids and w
ith two models found in the literature led to the evaluation of an effectiv
e diffusion coefficient for each model. This parameter was shown to depend
on cross-flow velocity and concentration.