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Flow Distribution Effects Upon Air Filter Performance Measurements
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Abstract
Problems have been encountered in the repeatability of performance measurements in the panel filter universal test housing specified by the Society of Automotive Engineers' SAE J726 Air Cleaner Test Code. The flow fields inside the test housing were analyzed for two different sized filters using flow visualization and two component laser doppler velocimeter (LDV) measurements. The analysis clearly indicated that the flow inside the housing was very turbulent, recirculating and separated from the walls. The filter in the housing receives non-uniform velocities with the central part receiving higher velocities than the sides. Simple filtration theories were applied to calculate the local filtration efficiencies for monodisperse particles for a clean filter. The predicted local efficiencies were integrated to give the effect of the non-uniform velocities upon the overall filter efficiency. Calculations predict that for larger particles the filtration efficiencies with a uniform flow distribution are better than with non-uniform flow distributions. For small particles the filtration efficiency decreases for the uniform flow distribution.
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Sabnis, R., Cai, Q., and Chambers, F., "Flow Distribution Effects Upon Air Filter Performance Measurements," SAE Technical Paper 940317, 1994, https://doi.org/10.4271/940317.Also In
References
- Society of Automotive Engineers 1987 “SAE J726 Air Cleaner Test Code - SAE Recommended Practice,” SAE, Inc. Warrendale, Pa
- Sabnis R. D. 1993 “Effects of non-uniform air flow through filters on filtration efficiencies,” Oklahoma State University, School of Mechanical and Aerospace Engineering Stillwater, Oklahoma
- Davies, C. N. 1973 Air filtration Academic Press Inc. New York
- Emi, H. Yoshioka, N. 1972 “Prediction of collection efficiencies of aerosols by fibrous filter,” Pacific Chemical Engineering Congress Kyoto, Japan 110 111
- Flagan, R. C. Seinfeld, J. H. 1988 Fundamentals of air pollution engineering Prentice Hall New Jersey
- Grant, D. C. Liu, B. Y. H. Fisher, W. G. 1989 “Particle capture mechanisms in gases and liquids: An analysis of operative mechanisms in membrane/fibrous filters,” The Journal of Environmental Sciences 31-32 43 51
- Landahl, H. D. Herrmann, R. G. 1949 “Sampling of liquid aerosols by wires, cylinders, and slides, and the efficiency of impaction of the droplets,” Journal of Colloid Science 4 103 136
- Lee, K. W. Liu, B. Y. H. 1982 “Experimental study of aerosol filtration by fibrous filters,” Aerosol Science and Technology 1 35 46
- Lee, K. W. Liu, B. Y. H. 1982 “Theoretical study of aerosol filtration by fibrous filters,” Aerosol Science and Technology 1 147 161
- McLaughlin, C. McComber, P. Gakwaya, A. 1986 “Numerical calculation of particle collection by a row of cylinders in a viscous fluid,” The Canadian Journal of Chemical Engineering 64 205 210
- Orr, C. 1977 Filtration - principles and practices Marcel Dekker, Inc. New York and Basel
- Payatakes, A. C. 1979 “Advances in dendritic deposition of aerosols by inertial impaction and/or interception,” Proceedings of The Second World Filtration Congress 507 519
- Ptak, T. Jaroszczyk, T. 1990 “Theoretical-experimental aerosol filtration model for fibrous filters at intermediate Reynolds number,” Proceedings of The Fifth World Filtration Congress Nice, France 566 572
- Rodman, C. A. 1979 “Filter media performance and fiber morphology,” Proceedings of The Second World Filtration Congress 257 267
- Rodman, C. A. Lessmann R. C. 1988 “Automotive nonwoven filter media: their construction and filter mechanisms,” TAPPI Journal 71 161 168
- Shapiro, M. Brenner, H. 1989 “Dispersion and deposition of aerosol particles in filters,” Journal of Aerosol Sciences 20 8 951 954
- Shapiro, M. Kettner, I. J. Brenner, H. 1991 “Transport mechanics and collection of submicrometer particles in fibrous filters,” Journal of Aerosol Sciences 22 6 707 722
- Spielman, L. A. 1977 “Particle capture from low-speed laminar flows,” Annual Review of Fluid Mechanics 9 297 319
- Stechkina, I. B. Fuchs, N. A. 1966 “Studies on fibrous aerosol filters - I. Calculation of diffusional deposition of aerosols in fibrous filters,” The Annals of Occupational Hygiene 9 59 64
- Stechkina, I. B. Kirsch, A. A. Fuchs, N. A. 1969 “Studies on fibrous aerosol filters - IV. Calculation of aerosol deposition in model filters in the range of maximum penetration,” The Annals of Occupational Hygiene 12 1 8
- Stenhouse, J. I. T. 1975 “Filtration of air by fibrous filters,” Filtration and Separation 12 268 274
- Suneja, S. K. Lee, C. H. 1974 “Aerosol filtration by fibrous filters at intermediate Reynolds number,” Atmospheric Environment 8 1081 1094
- Kuwabara, S. 1959 “The forces experienced by randomly distributed parallel circular cylinders or spheres in a viscous flow at small Reynolds number,” Journal of Physical Society of Japan 14 4 527 532
- Harrop, J. A. Stenhouse, J. I. T. 1969 “The theoretical prediction of inertial impaction efficiency on fibrous filters,” Chemical Engineering Science 24 1475 1481
- Jaroszczyk, T. Wake, J. 1991 “Critical aerosol velocity in nonwoven filtration,” TAPPI Proceedings, Nonwoven Conference 125 135
- Cai, Q. 1993 “Study of air filter flow by computational fluid dynamics,” Oklahoma State University, School of Mechanical and Aerospace Engineering Stillwater, Oklahoma
- Haldhani, M. K. 1993 “Particle number density distribution and its time history for an automotive air filter,” Oklahoma State University, School of Mech. and Aero. Engineering Stillwater, Oklahoma