一种改进的卷式膜隔网通道压降预测模型

An improved predictive pressure drop model of spacer-filled channel for spiral wound membrane

为获得一种既具有一定物理意义又使用方便的卷式膜隔网通道压降评价方法,通过计算流体力学(CFD)模拟,在考察不同隔网结构参数对通道阻力影响规律的基础上,建立一种改进的卷式膜隔网通道压降预测模型。研究结果表明,该改进模型能够反映网丝间距、直径、夹角和孔隙率等结构参数对通道阻力特性的影响,合理预测多种隔网结构下的通道压降,与详细CFD模拟结果相关性系数为0.97。

The present work was aimed to build up a convenient evaluation method with the physical meaning,to determine the pressure drop of spacer-filled channels for spiral wound membranes.By computational fluid dynamics(CFD)simulations,an improved predictive model was developed for the pressure drop of spacer-filled channels. The improved model could account for impacts of various structural parameters,such as the channel length,filament diameter,flow attack angle,and spacer porosity.The results show that the improved model is capable of predicting the pressure drop for a wide variety of membrane channels,and its correlation coefficient with the detailed CFD simulation results is 0.97.The model can reasonably predict the channel pressure drop under a variety of spacer mesh structures.