纤维过滤介质内部三维流场模拟

Numerical simulation of three dimensional flow fields of fiber filter media

利用计算机技术创建了不同纤维排列方式下的纤维过滤介质三维模型,并对其内部的气相流场在不同填充率及过滤风速条件下进行数值模拟,得出3种纤维过滤介质结构的无因次压力损失表达式。模拟结果与Davies的实验关联式吻合较好。研究表明:过滤器压力损失随过滤风速呈现线性增加,随填充密度呈现非线性增加;3种纤维排列方式下纤维过滤介质的压力损失按大小排序依次为纤维交错排列、纤维对齐排列、纤维随机排列。

Three-dimensional models of fiber filter media made up of fibers with different arrangements were created with computer technology.And numerical simulation of the internal gas flow fields of the models under conditions of different solid volume fraction（SVF）,different face velocity and different fibrous arrangement was undertaken.Three dimensionless pressure drop expressions corresponding to the three kinds of fiber filter media were obtained.There is a good agreement between the simulated values and the Davies＇ s equation.The results indicate that the pressure drop increases linearly with the face velocity but it increases non-linear with the SVF.The pressure drop of these three types of fiber arrangement is as follows： staggered arrangement alignment arrangement random arrangement.