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Prediction of the particles collection and pressure-drop characteristics across fibrous media
A comparison of the results obtained from typical collection efficiency models of fibrous media to experimental values has been done in the current article. To predict the pressure drop of air across the filter more accurately, a new relationship of the nondimensional force is proposed in the consideration of slip flow and actual geometry of the filter. Then, the filtration performance for different structural and operating parameters is evaluated with a comprehensive index as the criterion, and the higher the values of comprehensive index, the better the filter performance. The results show that relative to the collection efficiency, the interference effects of fibers and the superficial velocity play more significant roles in the pressure drop. The lower the values of fiber volume fraction and velocity, the higher the value of comprehensive index. Similar-shaped curves that reflect the effect of velocity on the comprehensive index can be expected for different fiber diameters, but, in view of the different dominant capture mechanism at different velocities, they are not identical. At lower velocities, the larger the fiber diameter, the higher the value of comprehensive index. However, at higher velocities, the smaller the fiber diameter, the higher the value of comprehensive index.
Prediction of the particles collection and pressure-drop characteristics across fibrous media
A comparison of the results obtained from typical collection efficiency models of fibrous media to experimental values has been done in the current article. To predict the pressure drop of air across the filter more accurately, a new relationship of the nondimensional force is proposed in the consideration of slip flow and actual geometry of the filter. Then, the filtration performance for different structural and operating parameters is evaluated with a comprehensive index as the criterion, and the higher the values of comprehensive index, the better the filter performance. The results show that relative to the collection efficiency, the interference effects of fibers and the superficial velocity play more significant roles in the pressure drop. The lower the values of fiber volume fraction and velocity, the higher the value of comprehensive index. Similar-shaped curves that reflect the effect of velocity on the comprehensive index can be expected for different fiber diameters, but, in view of the different dominant capture mechanism at different velocities, they are not identical. At lower velocities, the larger the fiber diameter, the higher the value of comprehensive index. However, at higher velocities, the smaller the fiber diameter, the higher the value of comprehensive index.
Prediction of the particles collection and pressure-drop characteristics across fibrous media
Li, Xianli (author) / Qin, Hao (author) / You, Zhanping (author) / Yao, Wanxiang (author)
Science and Technology for the Built Environment ; 24 ; 638-647
2018-07-03
10 pages
Article (Journal)
Electronic Resource
English
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