导流网角度对反渗透膜元件内部定常流动的影响  

The influence of division net angle on the steady flow inside the reverse osmosis membrane element

作　　者：高炜帆 王清 林培锋[1] GAO Weifan;WANG Qing;LIN Peifeng(Faculty of Mechanical Engineering&Automation,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学机械与自动控制学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2022年第1期44-50,共7页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(51676173);浙江省重点研发计划项目(2020C03081)。

摘　　要：采用k-e湍流模型和多孔介质模型,对不同导流网角度的反渗透膜元件内部流动过程进行定常数值模拟,以研究导流网角度对反渗透膜元件内部产水率的影响。首先为了确定进口边界条件,对导流网角度为90°的原型导流网膜元件做了不同压力下的产水量实验;其次通过数值模拟对比分析了原型、45°、60°和120°等不同角度导流网对反渗透膜元件内部压力、速度、湍动能和拟涡能云图的影响,并对导流网角度对反渗透膜元件内部流动特性的影响进行了分析。结果表明:在进口压力为0.9 MPa时,反渗透膜元件内部的产水量基本趋于稳定,且产水量比较高。导流网角度的改变对反渗透膜元件内部流动状态有明显的改善,其中,120°的导流网膜元件可以承受更大的压力,更好地减少膜内湍流耗散,单位时间涡量小,膜内部产水率最高,对工程应用实践有一定的参考意义。The internal flow of the reverse osmosis membrane elements with different diversion net angles are simulated with steady flow to study the influence of the diversion net angle on the water production rate of the reverse osmosis membrane element by using the k-e turbulence model and the porous media model. First of all, to determine the inlet boundary conditions, water production experiments under different pressures are carried out on the prototype diversion membrane element with a diversion net angle of 90°. Secondly, the effect of the prototype and the diversion nets with different angles, including 45°, 60° and 120°, on the internal pressure, velocity, turbulent energy and enstrophy cloud diagrams of reverse osmosis membrane element are compared and analyzed by means of numerical simulation, and the influence of diversion net angle on the internal flow characteristics of reverse osmosis membrane element is analyzed. The results show that when the inlet pressure is 0.9 MPa, the water production inside reverse osmosis membrane element is basically stable, and the water production rate is relatively high. The change of division net angle significantly improves the internal flow state of the reverse osmosis membrane element. Among them, a diversion membrane element at 120° can bear greater pressure and better reduce turbulent dissipation in the membrane, the vorticity per unit time is small, and the water production rate inside the membrane is the highest, which is of a reference significance for engineering application practice.

关 键 词：导流网角度 反渗透膜元件 多孔介质模型 数值模拟 产水率 

分 类 号：TB302[一般工业技术—材料科学与工程]