• 流动与传递 •

### 滑移效应下纤维绕流场及过滤阻力的数值计算与分析

1. 1. 东华大学环境科学与工程学院，上海 201620 2. 桂林航天工业学院能源与建筑环境学院，广西 桂林 541004
• 收稿日期:2020-03-09 修回日期:2020-04-22 出版日期:2021-01-22 发布日期:2021-01-21
• 通讯作者: 付海明 fhm@dhu.edu.cn
• 基金资助:
基于分形理论空气过滤 尘滤尘机理及过滤模型;声波协同纳米纤维强化微细颗粒物清除机理与过滤性能优化

### Numerical calculation and analysis of flow field and filtration resistance for fiber media with gas slip effect

Hui YANG1,2, Hui ZHU2, Yongping CHEN2, Haiming FU1*

1. 1. School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China 2. Department of Energy Engineering and Building Environment, Guilin University of Aerospace Technology, Guilin, Guangxi 541004, China
• Received:2020-03-09 Revised:2020-04-22 Online:2021-01-22 Published:2021-01-21
• Contact: Hai-ming noneFU fhm@dhu.edu.cn

Abstract: A numerical method was developed to calculate the flow field and filtration drag around nanofiber/microfiber with consideration of gas slip effect, and the effects of Knudsen number Knf and the fiber volume fraction C on velocity distribution around the fiber surface and fiber filtration resistance were discussed and analyzed. The results indicated that significant differences could be found between flow field around the fiber in slip flow regime and in no-slip flow regime for nanofiber/sub- microfiber filtration, especially for the case of high fiber volume fraction where the maximum slip velocity along the fiber surface approached the filtration velocity, however, the gas slip effect had a negligible influence on flow field and filtration resistance for large-scale microfiber filtration. Moreover, existing filtration resistance coefficient models developed for fibrous filter were inadequate in predicting nanofiber filtration resistance coefficient in slip flow regime, and orders of magnitude deviation could be seen between the different filtration resistance coefficient expressions. Based on the simulation results, a reliable expression for the nanofiber/microfiber filtration resistance coefficient in the range of 0.01≤C≤0.1 and 0.013≤Knf≤2 was developed.