Exposure risk analysis of COVID-19 for a ride-sharing motorbike taxi.
Exposure risk analysis of COVID-19 for a ride-sharing motorbike taxi.
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DOI：
10.1063/5.0069454
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发表时间：
2021-11
期刊：
影响因子：
--
通讯作者：
Wadud Z
中科院分区：
文献类型：
--
作者：
Hetherington R;Toufique Hasan ABM;Khan A;Roy D;Salehin M;Wadud Z
呼吸道疾病COVID-19的主要传播方式是通过空气中携带病毒的气溶胶。随着全国封锁解除，人们开始再次出行，需要对不同形式的公共交通相关风险进行评估。本文评估了在乘坐共享摩托车出租车的背景下传播的风险，这是南亚和东南亚以及撒哈拉以南非洲地区辅助运输的热门选择。流体动力学在理解在呼吸事件（例如咳嗽）期间从易感个体喷射的液滴的命运方面起着重要作用。数值模拟在这里使用欧拉-拉格朗日方法的颗粒和雷诺平均的Navier-Stokes方法的背景气流。假设驾驶员呼出病毒载液滴，这些病毒载液滴通过背景流向乘客输送。模拟颗粒大小为1、10、…的单次咳嗽，摩托车速度。研究表明，小颗粒和大颗粒会造成不同类型的风险。根据摩托车的速度，大颗粒可能会存款到乘客身上，而较小的颗粒会在骑手之间移动，并可能被乘客吸入。为了降低传染给乘客的风险，在乘客之间放置了防护罩。防护罩不仅可以作为阻挡颗粒的屏障，还可以改变乘客周围的流场，将颗粒从乘客身边推开。因此，本文的研究结果支持增加一个可能使旅程更安全的盾牌。
A dominant mode of transmission for the respiratory disease COVID-19 is via airborne virus-carrying aerosols. As national lockdowns are lifted and people begin to travel once again, an assessment of the risk associated with different forms of public transportation is required. This paper assesses the risk of transmission in the context of a ride-sharing motorbike taxi—a popular choice of paratransit in South and South-East Asia and Sub-Saharan Africa. Fluid dynamics plays a significant role in understanding the fate of droplets ejected from a susceptible individual during a respiratory event, such as coughing. Numerical simulations are employed here using an Eulerian–Lagrangian approach for particles and the Reynolds-averaged Navier–Stokes method for the background air flow. The driver is assumed to be exhaling virus laden droplets, which are transported toward the passenger by the background flow. A single cough is simulated for particle sizes 1, 10, , with motorbike speeds . It has been shown that small and large particles pose different types of risk. Depending on the motorbike speed, large particles may deposit onto the passenger, while smaller particles travel between the riders and may be inhaled by the passenger. To reduce risk of transmission to the passenger, a shield is placed between the riders. The shield not only acts as a barrier to block particles, but also alters the flow field around the riders, pushing particles away from the passenger. The findings of this paper therefore support the addition of a shield potentially making the journey safer.
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DOI：
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发表时间：
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期刊：
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影响因子：
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