A computational study of expiratory particle transport and vortex dynamics during breathing with and without face masks
A computational study of expiratory particle transport and vortex dynamics during breathing with and without face masks
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DOI：
10.1063/5.0054204
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发表时间：
2021-06-01
影响因子：
4.6
通讯作者：
Sotiropoulos, Fotis
中科院分区：
文献类型：
--
作者：
Khosronejad, Ali;Kang, Seokkoo;Sotiropoulos, Fotis
我们提出了高保真的数值模拟呼气生物溶胶运输在正常呼吸室内，停滞的空气条件下，有和没有一个轻便的面具。我们研究了口罩抑制唾液颗粒传播的功效，这是现有社交距离建议的基础。本模拟纳入人体解剖学的影响，并考虑唾液颗粒大小的范围从0.1到10 μ m的频谱，同时也占他们的蒸发。这些模拟阐明了人类呼吸的涡度动力学，并表明如果没有一个轻便的面罩，唾液颗粒可以远离人2.2米。然而，非医用级口罩可以大大减少唾液颗粒传播到距离人0.72 m处。这项研究提供了新的定量证据，证明简易口罩可以成功地抑制唾液颗粒在室内环境中因正常呼吸而传播。
We present high-fidelity numerical simulations of expiratory biosol transport during normal breathing under indoor, stagnant air conditions with and without a facile mask. We investigate mask efficacy to suppress the spread of saliva particles that is underpinnings existing social distancing recommendations. The present simulations incorporate the effect of human anatomy and consider a spectrum of saliva particulate sizes that range from 0.1 to 10 mu m while also accounting for their evaporation. The simulations elucidate the vorticity dynamics of human breathing and show that without a facile mask, saliva particulates could travel over 2.2 m away from the person. However, a non-medical grade face mask can drastically reduce saliva particulate propagation to 0.72 m away from the person. This study provides new quantitative evidence that facile masks can successfully suppress the spreading of saliva particulates due to normal breathing in indoor environments.