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10.1063/5.0031996

http://scihub22266oqcxt.onion/10.1063/5.0031996
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33244212!7684679!33244212
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suck abstract from ncbi


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pmid33244212      Phys+Fluids+(1994) 2020 ; 32 (11): 111703
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  • Flow visualization of an N95 respirator with and without an exhalation valve using schlieren imaging and light scattering #MMPMID33244212
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  • Phys Fluids (1994) 2020[Nov]; 32 (11): 111703 PMID33244212show ga
  • This work demonstrates the qualitative fluid flow characteristics of a standard N95 respirator with and without an exhalation valve. Schlieren imaging was used to compare an adult male breathing through an N95 respirator with and without a valve. The schlieren imaging technique showed the flow of warm air passing through these respirators but did not provide information about droplet penetration. For this, strategic lighting of fog droplets was used with a mannequin head to visualize the penetration of droplets through both masks. The mannequin exhaled with a realistic flow rate and velocity that matched an adult male. The penetration of fog droplets was also visualized with a custom system that seals each respirator onto the end of a flow tube. Results of these qualitative experiments show that an N95 respirator without an exhalation valve is effective at blocking most droplets from penetrating through the mask material. Results also suggest that N95 respirators with exhalation valves are not appropriate as a source control strategy for reducing the proliferation of infectious diseases that spread via respiratory droplets.
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