title: Experimental investigation of air pressure affecting filtration performance of fibrous filter sheet.
abstract: Understanding the effect of air pressure on their filtration performance is important for assessing the effectiveness of fibrous filters under different practical circumstances. The effectiveness of three classes of air filter sheets were investigated in laboratory-based measurements at a wide range of air pressures (60-130 KPa). The filtration efficiency was found most sensitive to the air pressure change at smaller particle sizes. As the air pressure increased from 60 to 130 KPa, significant decrease in filtration efficiency (up to 15%) and increase in pressure drop (up to 90 Pa) were observed. The filtration efficiency of the filter sheet with largest fiber diameter and smallest solid volume fraction was affected most, while the pressure drop of the filter sheet with smallest fiber diameter and largest solid volume fraction was affected most. The effect of air pressure on the filtration efficiency was slightly larger at greater filter face air velocity. However, the effect of air pressure on the pressure drop was negligible. The filtration efficiency and pressure drop were explicitly expressed as functions of the air pressure. Two coefficients were empirically derived and successfully accounted for the effects of air pressure on filtration efficiency and pressure drop.
authors.affiliation: a State Key Laboratory of Pollution Control and Resource Reuse , Tongji University , Shanghai , People's Republic of China.|b Department of Environmental Engineering , Tongji University , Shanghai , People's Republic of China.
authors.forename: Bin
authors.initials: B
authors.lastname: Xu
authors.affiliation: b Department of Environmental Engineering , Tongji University , Shanghai , People's Republic of China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Yu
authors.affiliation: c School of Mechanical Engineering , Tongji University , Shanghai , People's Republic of China.
authors.forename: Ya
authors.initials: Y
authors.lastname: Wu
authors.affiliation: c School of Mechanical Engineering , Tongji University , Shanghai , People's Republic of China.
authors.forename: Zhongping
authors.initials: Z
authors.lastname: Lin
mesh_terms: D061808:Air Filters; D000393:Air Pollutants; D000399:Air Pressure; D010316:Particle Size; D052638:Particulate Matter
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter
keywords: Air filtration; air pressure; air purification; filtration performance; particle filtration