Face Coverings, Aerosol Dispersion and Mitigation of Virus Transmission Risk
IEEE Open Journal of Engineering in Medicine and Biology(2021)
摘要
The SARS-CoV-2 virus is primarily transmitted through virus-laden fluid particles ejected from the mouth of infected people. Face covers can mitigate the risk of virus transmission but their outward effectiveness is not fully ascertained.
Objective:
by using a background oriented schlieren technique, we aim to investigate the air flow ejected by a person while quietly and heavily breathing, while coughing, and with different face covers.
Results:
we found that all face covers without an outlet valve reduce the front flow through by at least 63% and perhaps as high as 86% if the unfiltered cough jet distance was resolved to the anticipated maximum distance of 2-3 m. However, surgical and handmade masks, and face shields, generate significant leakage jets that may present major hazards.
Conclusions:
the effectiveness of the masks should mostly be considered based on the generation of secondary jets rather than on the ability to mitigate the front throughflow.
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关键词
COVID-19 pandemic,face coverings,face masks,aerosol dispersal,aerosol generating procedures
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