Wang C T, Xu J C, Fu S C, Chao Christopher Y H
Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China; Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.
Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.
Travel Med Infect Dis. 2022 May-Jun;47:102285. doi: 10.1016/j.tmaid.2022.102285. Epub 2022 Mar 18.
Expiratory droplets cause high infection risk to nearby passengers via airborne route.
We built a two-row four-seat setup to simulate a public transport cabin. A cough generator and a nebulizer were used to simulate the cough and talk processes respectively. Exposure and infection risk of nearby passengers was studied. The effect of gasper jet and backrest on risk mitigation was investigated.
For the activity of coughing, the front passenger has much higher infection risk, which was around four times of that of other passengers, because of the concentration surge in the inhalation zone. For talking, the nearby passengers have similar infection risk because nearby passengers were all exposed to concentration surges with similar peak value. Gasper jet of the infected passenger and higher backrest can extinguish or reduce the concentration surge of front passengers and reduce the infection risk due to coughing and talking droplets.
The passengers near the infected passenger have very high infection risk. The overhead gasper and a higher backrest can reduce the exposure and mitigate the risk of infection. It is believed that the control measures to protect nearby passengers are urgently needed in public transport cabins.
呼气飞沫通过空气传播途径给附近乘客带来较高感染风险。
我们构建了一个两排四座的设置来模拟公共交通车厢。分别使用咳嗽发生器和雾化器来模拟咳嗽和说话过程。研究了附近乘客的暴露和感染风险。研究了通风口喷气和靠背对降低风险的影响。
对于咳嗽活动，前排乘客的感染风险高得多，由于吸入区域的浓度激增，其感染风险约为其他乘客的四倍。对于说话，附近乘客的感染风险相似，因为附近乘客都暴露于具有相似峰值的浓度激增中。受感染乘客的通风口喷气和更高的靠背可以消除或减少前排乘客的浓度激增，并降低因咳嗽和说话飞沫导致的感染风险。
受感染乘客附近的乘客感染风险非常高。头顶通风口和更高的靠背可以减少暴露并降低感染风险。人们认为，公共交通车厢迫切需要采取保护附近乘客的控制措施。
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