期刊
IEEE OPEN JOURNAL OF ENGINEERING IN MEDICINE AND BIOLOGY
卷 2, 期 -, 页码 26-35出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/OJEMB.2021.3053215
关键词
COVID-19 pandemic; face coverings; face masks; aerosol dispersal; aerosol generating procedures
资金
- European Research Council [759546]
- UK Engineering and Physical Sciences Research Council [EP/P020593/1, EP/L016680/1, BB/P013740/1]
- UK Biotechnology and Biological Sciences Research Council
- Higher Education Commission of Pakistan
- European Research Council (ERC) [759546] Funding Source: European Research Council (ERC)
Face covers can reduce the risk of virus transmission, but the effectiveness varies depending on the type of mask, with some masks potentially presenting leakage hazards.
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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