CIESC Journal ›› 2010, Vol. 61 ›› Issue (10): 2615-2619.
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ZOU Linling;QI Hong;XING Weihong
Online:
Published:
邹琳玲;漆虹;邢卫红
Abstract:
Membrane thickness has significant effect on permeability of membrane.In this work the membrane thickness gradient of isoflux ceramic membrane was calculated with the Navier-Stokes and Darcy equations,which governed the bulk flow and the flow through the membrane, respectively.The specific resistance of porous medium was calculated by Konzey-Carmen equation.The results showed that the membrane thickness was approximately linear to the distance in axial direction.The cross-flow velocity had a significant influence on the membrane thickness gradient along the axial direction, so it is necessary to choose different membrane thickness gradient along the axial direction to obtain uniform trans-membrane pressure at different cross-flow velocity.The effects of pressure and temperature were relatively insignificant.The result of this study may provide guidance on membrane preparation and application.
Key words: 恒通量膜, 计算流体力学, 膜厚度
恒通量膜,
摘要: 膜厚度对膜渗透性能有着显著影响。本文结合Navier-Stokes公式和Darcy定律对恒通量膜的膜厚度沿程分布进行了模拟计算。膜通道内的主体流动采用Navier-Stokes公式来描述,多孔介质内的流动采用Darcy定律来描述,多孔介质比阻采用Konzey-Carmen方程来计算。结果表明,膜厚度的沿程分布趋近于线性分布,并随操作压力、错流速率、操作温度的变化而变化。错流速率对膜厚度分布的影响尤为显著,而压力和温度的影响较小。在不同的错流速率下,要实现恒通量操作,必须有合适的膜厚沿程分布的膜。本计算结果为恒通量膜的制备、应用提供了依据。
关键词: 恒通量膜, 计算流体力学, 膜厚度
ZOU Linling, QI Hong, XING Weihong. Membrane thickness gradient of isoflux ceramic membrane based on CFD[J]. CIESC Journal, 2010, 61(10): 2615-2619.
邹琳玲, 漆虹, 邢卫红. 基于CFD的恒通量陶瓷膜厚度设计 [J]. 化工学报, 2010, 61(10): 2615-2619.
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