Prediction of mass transfer coefficient with suction for turbulent flow incross flow ultrafiltration

Sherwood number relations for the prediction of the mass transfer coefficie nt for developing concentration boundary layer have been obtained for turbu lent flow regime from first principles. The common flow modules, namely, re ctangular channel, tubular and radial cross flow are considered, The relati onships developed include the effect of suction through the membrane. Relev ant relations for the estimation of mass transfer coefficient for cross how ultrafiltration are formulated. The proposed Sherwood relations are used i n conjunction with the osmotic pressure model to predict the permeate flux in osmotic pressure governed ultrafiltration. The simulated results are com pared with the experimental data obtained from the literature. A detailed p arametric study has been performed to observe the effects of the operating conditions on the filtration performance in terms of the permeate quantity and quality. (C) 1999 Elsevier Science B.V. All rights reserved.