摘要
用CFD软件FLUENT对纤维过滤器内部流场进行数值模拟,以熔体静电纺丝纤维膜为原型,探究纤维过滤器出口位置对过滤效率的影响,从速度分布、过滤压降及颗粒分布等方面进行对比.结果表明:过滤器压降随速度的增大而增大,随孔隙率的增大而减小,且膜后压力随速度增大成减小趋势;对多种纤维膜对比模拟发现,侧出口模型具有死水区,且颗粒分布不均,降低了膜使用率,将出口置于容器底部可有效减缓这种缺点;下出口模型较侧出口模型更能发挥纤维多孔介质的优势.
In order to explore the internal flow field of the fiber filter, numerical simulation was carried out using CFD mftware FLUENT. This study centered on the influence of exit position of filter on the filtration efficiency, which were evaluated from velocity distribution, pressure drop, particle distribution and so on The results showed that, the pressure drop of membranes was proportionate to the filtration velocity, while the pressure after membrane decreased with the increasing velocity. The model of side outlet had water dead zone and uneven distribution of particles which would reduce the usage rates of membrane. Placing the side outlet at the bottom of the container could effectively reduce these disadvantages. The model of bottom outlet could show the advantages of porous media are more prominent than that of side outlet.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2015年第1期23-27,共5页
Membrane Science and Technology
基金
北京市自然科学基金资助项目(2141002)
