化工学报2000，Vol.21Issue(5)：695-698,4.
反渗透过程的浓度极化及其传质系数测定
CONCENTRATION POLARIZATION AND MEASUREMENT OF MASS TRANSFER COEFFICIENT FOR REVERSE OSMOSIS
摘要
Abstract
The relationship between osmotic pressure difference across the membrane and mass transfer coefficient is developed in this paper. On the basis of this relationship, a method for measuring mass transfer coefficient by using experimental data on reverse osmosis is established. Pitzer's equations are used to calculate osmotic pressure differences in order to assure accuracy of results. Under the conditions of constant operating pressure and bulk flow, mass transfer coefficient is scarcely affected by membrane structure, but decreases slightly with increasing feed concentration. The solute concentration in the polarization layer is calculated by using the measured values of mass transfer coefficient. Polarization layer concentration increases with augmentation in bulk concentration. However, their difference increases with increasing bulk concentration until a maximum difference is reached, and then decreases. Mass transfer coefficient increases with higher velocity of bulk flow. If mass transfer coefficient is so large that the ratio(PwΔπσ/k)becomes very small, polarization could be neglected.关键词
反渗透/浓度极化/传质系数Key words
reverse osmosis/concentration polarization/mass transfer coefficient分类
化学化工引用本文复制引用
胡中爱,吴红英..反渗透过程的浓度极化及其传质系数测定[J].化工学报,2000,21(5):695-698,4.基金项目
甘肃省自然科学基金资助项目(No.ZR-95-015). （No.ZR-95-015）
