Document Detail

Particle size-dependent leakage and losses of aerosols in respirators.
MedLine Citation:
PMID:  3687729     Owner:  NLM     Status:  MEDLINE    
Measuring particle size-dependent leakage into and losses inside a respirator reveals the deposition mechanisms occurring at the leak site and the flow dynamics inside the respirator. This study investigated particle size-dependent leakage and deposition within the mask by examining the leakage into the mask for different hole locations, probe locations, hole shapes, hole lengths and hole sizes. The shape of the leak has an effect on particle size-dependent leakage. Probe and leak location tests indicated that not only does the total measured leakage change but also the size-dependence of the leakage changes depending on the leak and probe locations. When the leak site is in the chin area, the clean air entering through the filters at the chin helps to carry the inward leakage into the breathing zone. Particle size-dependent leakage does occur and is due to both inertial entry losses at the leak site and within the mask, and diffusional losses within the mask and leak site. Particle size-dependent curves change shape as the hole size changes with relatively more larger particles entering through the small hole size.
P M Holton; D L Tackett; K Willeke
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  American Industrial Hygiene Association journal     Volume:  48     ISSN:  0002-8894     ISO Abbreviation:  Am Ind Hyg Assoc J     Publication Date:  1987 Oct 
Date Detail:
Created Date:  1988-01-13     Completed Date:  1988-01-13     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0371160     Medline TA:  Am Ind Hyg Assoc J     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  848-54     Citation Subset:  IM    
Department of Environmental Health, University of Cincinnati, OH 45267-0056.
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MeSH Terms
Aerosols / analysis*
Equipment Failure
Particle Size
Protective Devices / standards*
Respiratory Protective Devices / standards*
Grant Support
R01-0H-01301//PHS HHS
Reg. No./Substance:

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