Selecting fiber materials to improve mist filters.
Letts-GM; Raynor-PC; Schumann-RL
J Aerosol Sci 2003 Nov; 34(11):1481-1492
As a filter captures droplets and retains liquid, the efficiency of the filter declines while the pressure droprises. Making filters that drain more effectively and retain less liquid may minimize effiency losses and pressure drop increases. Glass, polyester, and polyaramid fibers were observed microscopically as they collected droplets. Liquid spread much more readily on the polyaramid fibers than on the other kinds. Complete filters were then formed from glass and polyaramid fibers and tested for effciency, pressure drop, and liquid retention as they collected droplets. Although the filters made from polyaramid fibers exhibited less liquid retention and pressure drop increase, the reduction in efficiency between filters made from the two fiber types was not statistically different. These findings suggest that using higher surface energy fibers in mist filters may allow lower levels of liquid retention that result in wet filters with a lower pressure drop.
Airborne-particles; Air-contamination; Exposure-assessment; Exposure-methods; Fibrous-bodies; Fibrous-dusts; Fibrous-glass; Filter-fabrics; Filter-materials; Filters; Pollution Pressure-testing; Protective-measures; Public-health; Quantitative-analysis; Risk-analysis; Risk-factors; Statistical-analysis; Surface-properties;
Author Keywords: Filtration; Mist; Droplets; Fiber material; Efficiency; Pressure drop;
Peter C. Raynor, Division of Environmental and Occupational Health, School of Public Health, University of Minnesota, Mayo Mail Code 807, 420 Delaware St. SE, Minneapolis, MN 55455
Research Tools and Approaches: Control Technology and Personal Protective Equipment
Journal of Aerosol Science
University of Minnesota, Minneapolis, Minnesota