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Fundamental Study of Respiratory Air Filtration. Volume 2.

PB89152912

Publication Date	1988
Personal Author	Liu, B. Y. H.; Fardi, B.
Page Count	212
Abstract	Characteristics of particulate air filters used in respiratory protective devices were studied. Efforts were made to determine the overall efficiency of the filters as a function of particle size and as a function of the velocity of air flow through the filter. A determination was also made of the resistance of the filter media to the flow of air. A numerical simulation model was designed and applied to the study of particle collection by electrically charged filter fibers. The results of dimensionless viscous drag calculations on rectangular fibers were presented along with information regarding single electret fiber capture efficiency results due to the Brownian diffusion, interception, or electrostatics. Single fiber capture efficiency was found to be proportional to 0.778, 0.54, and 0.15 powers of the solid volume fraction for the diffusion, interception, and Coulombic force interaction mechanisms, respectively, when an individual mechanism prevailed. The peak penetration of both solid monodisperse sodium-chloride particles and liquid DOP particles through respirator filters ranged from 1.2 to 30% at 16 liters per minute (lmp), from 3.5 to 37% at 281pm, and from 6 to 45% at 481pm.
Keywords	Respirators Filtration Air filters Air flow Mathematical models Particle size Aerosols Numerical analysis Air filtration Personnel protective equipment
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	95G - Protective Equipment 46B - Fluid Mechanics
Corporate Authors	Minnesota Univ., Minneapolis. Particle Technology Lab.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes	See also Volume 1, PB89-152904. Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
Title Note	Final rept. 1 Sep 84-31 Dec 87,
NTIS Issue Number	198911

Fundamental Study of Respiratory Air Filtration. Volume 2.

Fundamental Study of Respiratory Air Filtration. Volume 2.
PB89152912

Publication Date	1988
Personal Author	Liu, B. Y. H.; Fardi, B.
Page Count	212
Abstract	Characteristics of particulate air filters used in respiratory protective devices were studied. Efforts were made to determine the overall efficiency of the filters as a function of particle size and as a function of the velocity of air flow through the filter. A determination was also made of the resistance of the filter media to the flow of air. A numerical simulation model was designed and applied to the study of particle collection by electrically charged filter fibers. The results of dimensionless viscous drag calculations on rectangular fibers were presented along with information regarding single electret fiber capture efficiency results due to the Brownian diffusion, interception, or electrostatics. Single fiber capture efficiency was found to be proportional to 0.778, 0.54, and 0.15 powers of the solid volume fraction for the diffusion, interception, and Coulombic force interaction mechanisms, respectively, when an individual mechanism prevailed. The peak penetration of both solid monodisperse sodium-chloride particles and liquid DOP particles through respirator filters ranged from 1.2 to 30% at 16 liters per minute (lmp), from 3.5 to 37% at 281pm, and from 6 to 45% at 481pm.
Keywords	Respirators Filtration Air filters Air flow Mathematical models Particle size Aerosols Numerical analysis Air filtration Personnel protective equipment
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	95G - Protective Equipment 46B - Fluid Mechanics
Corporate Authors	Minnesota Univ., Minneapolis. Particle Technology Lab.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes	See also Volume 1, PB89-152904. Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
Title Note	Final rept. 1 Sep 84-31 Dec 87,
NTIS Issue Number	198911