Abstract: The mass-transfer coefficient k is an important parameter for predicting the concentration polarization of reverse osmosis and other membrane separation processes. In order to determine the k value precisely, a diffusion current method with special porous electrodes has been developed. This method can be used to determine the k values for both one dimensional and two dimensional flow. It seems that the actual situation of membrane process is closely approached, so the dimensionless empirical equations obtained have a greater practical value. The equations of pre?ent work are compared with the data of previous authors. Many results seem to be in good agreement. Therefore this paper offers useful reference for research and design of diversified membrane separation systems in future.

摘要： 传质系数k是考察反渗透等膜过程中浓差极化的重要参数。为了较确切地测定k值,本文建立一种采用特制多孔电极的扩散电流法。这方法的特点是不仅可测一维流动而且可兼测二维流动k值的数据。由于比较模拟了膜过程的实际情况,所得无因次经验公式具有较大的实用意义。本文所介绍的一、二维流动的k值公式与前人工作结果对比,吻合情况良好。这为今后多种膜分离装置的研究和设计提供了有用的参考。