Use of pleated filter media for removing particles is required in industrial and residential sectors encompassing many applications. Pressure drop is an important factor used to evaluate the performance of pleated filter media. Research has been focused on examining the effects of pleated filter properties and pleat geometries on pressure drop and filtration efficiency but air velocity distributions. In this study, a noninvasive particle image velocimetry (PIV) technique was used to characterize the velocity distributions downstream of pleated filters. A custom filter containing a singular rectangular pleat was constructed for comparison between a computational fluid dynamics (CFD) numerical model and experimentally obtained PIV results. Results indicated that the trend between PIV and CFD was similar in general. Special attention is needed when modeling porous media as some discrepancies were observed near the corners of the pleated filter where the filter medium is less permeable due to compression of the fibers. Subsequently, the PIV technique was used with commercial pleated filters to study the effects of pleat geometry on the downstream velocity distributions. Air velocity distributions were affected by both the pleat geometry and the pleat stabilizing technique, which is commonly applied to pleated filters to maintain pleat shape and gaps between pleats. Results suggest that in addition to pleated filter geometry such as shape, density, and height, the geometric effects of pleat lock or pleat stabilizing techniques, should be also considered for estimating flow effects more realistically.
Bibliographical noteFunding Information:
The authors thank the support of members of the Center for Filtration Research: 3M Corporation, A.O. Smith Company, Applied Materials, Inc., BASF Corporation, Boeing Company, Corning Co., China Yancheng Environmental Protection Science and Technology City, Cummins Filtration Inc., Donaldson Company, Inc., Entegris, Inc., Ford Motor Company, Guangxi Wat Yuan Filtration System Co. Ltd, LG Electronics Co., MSP Corporation; Samsung Electronics Co. Ltd., Xinxiang Shengda Filtration Technology Co. Ltd., TSI Inc., W. L. Gore & Associates, Inc., Shigematsu Works Co. Ltd., and the affiliate member National Institute for Occupational Safety and Health (NIOSH). Donaldson Company, Inc graciously provided the commercial filters studies.
© 2019 Elsevier B.V.
- Computational fluid dynamics (CFD)
- Particle image velocimetry (PIV)
- Pleat lock
- Pleated filters