Visualizing the effectiveness of face masks in obstructing respiratory jets

被引:218
作者
Verma, Siddhartha [1 ,2 ]
Dhanak, Manhar [1 ]
Frankenfield, John [1 ]
机构
[1] Florida Atlantic Univ, Dept Ocean Engn, Boca Raton, FL 33431 USA
[2] Florida Atlantic Univ, Harbor Branch Oceanog Inst, Ft Pierce, FL 34946 USA
关键词
AEROSOL TRANSMISSION; INDOOR ENVIRONMENTS; EXHALED AIR; DROPLETS; COUGH; VENTILATION; INFECTION; INFLUENZA; EFFICACY; DISPERSION;
D O I
10.1063/5.0016018
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The use of face masks in public settings has been widely recommended by public health officials during the current COVID-19 pandemic. The masks help mitigate the risk of cross-infection via respiratory droplets; however, there are no specific guidelines on mask materials and designs that are most effective in minimizing droplet dispersal. While there have been prior studies on the performance of medical-grade masks, there are insufficient data on cloth-based coverings, which are being used by a vast majority of the general public. We use qualitative visualizations of emulated coughs and sneezes to examine how material- and design-choices impact the extent to which droplet-laden respiratory jets are blocked. Loosely folded face masks and bandana-style coverings provide minimal stopping-capability for the smallest aerosolized respiratory droplets. Well-fitted homemade masks with multiple layers of quilting fabric, and off-the-shelf cone style masks, proved to be the most effective in reducing droplet dispersal. These masks were able to curtail the speed and range of the respiratory jets significantly, albeit with some leakage through the mask material and from small gaps along the edges. Importantly, uncovered emulated coughs were able to travel notably farther than the currently recommended 6-ft distancing guideline. We outline the procedure for setting up simple visualization experiments using easily available materials, which may help healthcare professionals, medical researchers, and manufacturers in assessing the effectiveness of face masks and other personal protective equipment qualitatively.
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页数:7
相关论文
共 60 条
[1]   RETRACTED: Effectiveness of Surgical and Cotton Masks in Blocking SARS-CoV-2: A Controlled Comparison in 4 Patients (Retracted Article) [J].
Bae, Seongman ;
Kim, Min-Chul ;
Kim, Ji Yeun ;
Cha, Hye-Hee ;
Lim, Joon Seo ;
Jung, Jiwon ;
Kim, Min-Jae ;
Oh, Dong Kyu ;
Lee, Mi-Kyung ;
Choi, Seong-Ho ;
Sung, Minki ;
Hong, Sang-Bum ;
Chung, Jin-Won ;
Kim, Sung-Han .
ANNALS OF INTERNAL MEDICINE, 2020, 173 (01) :W22-W23
[2]   Airborne or Droplet Precautions for Health Workers Treating Coronavirus Disease 2019? [J].
Bahl, Prateek ;
Doolan, Con ;
de Silva, Charitha ;
Chughtai, Abrar Ahmad ;
Bourouiba, Lydia ;
MacIntyre, C. Raina .
JOURNAL OF INFECTIOUS DISEASES, 2022, 225 (09) :1561-1568
[3]   Dispersal of exhaled air and personal exposure in displacement ventilated rooms [J].
Bjorn, E ;
Nielsen, PV .
INDOOR AIR, 2002, 12 (03) :147-164
[4]   Turbulent Gas Clouds and Respiratory Pathogen Emissions Potential Implications for Reducing Transmission of COVID-19 [J].
Bourouiba, Lydia .
JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION, 2020, 323 (18) :1837-1838
[5]   Violent expiratory events: on coughing and sneezing [J].
Bourouiba, Lydia ;
Dehandschoewercker, Eline ;
Bush, John W. M. .
JOURNAL OF FLUID MECHANICS, 2014, 745 :537-563
[6]   Indirect Virus Transmission in Cluster of COVID-19 Cases, Wenzhou, China, 2020 [J].
Cai, Jing ;
Sun, Wenjie ;
Huang, Jianping ;
Gamber, Michelle ;
Wu, Jing ;
He, Guiqing .
EMERGING INFECTIOUS DISEASES, 2020, 26 (06) :1343-1345
[7]  
Centers for Disease Control and Prevention, 2013, CS234269 CDCP
[8]  
Centers for Disease Control and Prevention, 2020, SOC DIST QUAR IS
[9]  
Centers for Disease Control and Prevention, 2020, COVID 19 PAND PLANN
[10]  
Centers for Disease Control and Prevention, 2020, MAK YOUR OWN FAC COV