平板膜组件中隔网构型的CFD模拟

摘要

在由卷式膜组件简化成的平板膜组件的隔网流道中,利用计算流体动力学(CFD)方法对流道中纤维丝的排布方式进行二维模拟.考察了3种排布方式(同边,交错,中心)下,流体的速度分布以及对于壁面的剪应力分布.结果表明,交错排列的方式效果最佳.当提升流体流速时,纤维丝背后产生的逆流区域范围逐步增大,但存在一定的上限值.通过自行搭建的平板膜组件测试装置,考察了纤维丝不同排布方式下的Re和摩擦因子f的关系曲线,与CFD模拟得到的结果比较吻合良好,证明了模型的准确性.%Spiral wound modules was one of most common membrane configurations in membrane separation application.Due to its special structure,it could always be simplified as spacer-filled channels in plate-and-frame modules to be investigate.Computational fluid dynamics was adopted to get insight into the effect of spacer characteristics in two-dimensional channels.The velocity distribution and wall shear stress were studied under three different spacer arrangements (cavity,zigzag,submerged).The results suggested that the zigzag spacer cylinder alternately on the top and bottom wall was more desirable.With the increase of the fluid flow,the range of reverse flow region had a top limit.While,further ascending velocity could not promote the acting range but the acting effect.A self-designed apparatus with spacer array was made to study the pressure drops.The Re-f relations were obtained under different spacer arrangements and velocities,which were in good agreement with the CFD simulation.