Fluid mechanics of facial masks as personal protection equipment (PPE) of COVID-19 virus.
Fluid mechanics of facial masks as personal protection equipment (PPE) of COVID-19 virus.
复制标题
作为 COVID-19 病毒个人防护装备 (PPE) 的面罩的流体力学。
DOI：
10.1063/5.0050133
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
K. Habib
中科院分区：
文献类型：
--
作者：
A. Habib;L. Habib;K. Habib
建立了通过口罩（膜）屏蔽COVID-19病毒的吸入气体、氮气（N2）和氧气（O2）气体以及呼出气体成分（CO2和水蒸气颗粒）的流体力学模型。该模型是基于通常通过膜发生的几种气体通量贡献而开发的。根据孔隙度大小（1 ~ 30 nm）、空隙率（10 ~ 3% ~ 0.3%）和膜厚度（10 ~ 40µm）与COVID-19病毒大小的比较等几个参数，预测了N95口罩数学模型的半经验解。首次引入无单位数Nr来描述O2、N2和CO2气体通过多孔膜的半经验溶液。采用规格为a = 20 nm, l = 30µm, ε = 30%的N95口罩作为个人防护装备（PPE），确定了表达吸入空气中O2和N2通过多孔膜的最佳Nr （NO2 = NN2 = -4.4）。最佳Nr数的概念可以标准化，不仅可以用于测试市售口罩作为ppe，还可以用于设计保护人类免受COVID-19病毒感染的新口罩。
A fluid mechanics model of inhaled air gases, nitrogen (N2) and oxygen (O2) gases, and exhaled gas components (CO2 and water vapor particles) through a facial mask (membrane) to shield the COVID-19 virus is established. The model was developed based on several gas flux contributions that normally take place through membranes. Semiempirical solutions of the mathematical model were predicted for the N95 facial mask accounting on several parameters, such as a range of porosity size (i.e., 1-30 nm), void fraction (i.e., 10-3%-0.3%), and thickness of the membrane (i.e., 10-40 µm) in comparison to the size of the COVID-19 virus. A unitless number (Nr) was introduced for the first time to describe semiempirical solutions of O2, N2, and CO2 gases through the porous membrane. An optimum Nr of expressing the flow of the inhaled air gases, O2 and N2, through the porous membrane was determined (NO2 = NN2 = -4.4) when an N95 facial mask of specifications of a = 20 nm, l = 30 µm, and ε = 30% was used as a personal protection equipment (PPE). The concept of the optimum number Nr can be standardized not only for testing commercially available facial masks as PPEs but also for designing new masks for protecting humans from the COVID-19 virus.