基于有限体积法的卷式膜组件流道内多场模拟研究

Multi-field simulation of the flow channel of spiral wound module by finite volume method

采用有限体积法(FVM)对卷式膜组件流道中流场与浓度场进行多场模拟研究,分析了3种不同导流网丝之间夹角(60°、90°与120°)下卷式膜组件流道内速度、压力以及膜面剪切应力分布.模拟结果表明,随着导流网丝之间夹角逐渐增大,流道内流体流速增加,膜面附近浓差极化减弱.当导流网丝之间夹角从60°增加到90°时,膜面壁面剪切应力增加12%,流道内沿程压降增加10%;从90°增加到120°时,膜面壁面剪切应力增加14%,流道内沿程压降增加15%.因此,在能量损失允许的范围内,适当增加导流网丝之间夹角利于缓解膜面附近浓差极化.

This study focused on the multi-field simulation of the flow channel of spiral wound membrane module by finite volume method(FVM). The(FVM) The fluid velocity, pressure and wall shear stress distributions within the flow channel of spiral wound membrane module with the feed spacer of different filament included angles(60°, 90° and 120°) were simulated by FVM method. The results showed that, with the increase of the included angle between filaments of feed spacer, the velocity of the fluid within the channel increased and the concentration polarization near membrane surface became weakened. With the included angle ascended from 60° to 90°, the wall shear stress on the membrane surface was enhanced by 12% and the pressure drop along the flow channel increased by 10%. When the included angle ascended from 90° to 120°, the wall shear stress on the membrane surface was enhanced by 14% and the pressure drop along the flow channel increased by 15%. Therefore, as far as the loss of energy is allowed, the increase of included angle between the filaments of feed spacers was beneficial to alleviate the concentration polarization near the membrane surface.