论文标题
咳嗽期间液滴的空气传播：病毒传播的物理模型
Airborne dispersion of droplets during coughing: a physical model of viral transmission
论文作者
论文摘要
COVID-19大流行将注意力集中在病毒的空中传播上。使用逼真的气流模拟，我们从咳嗽中对液滴分散进行建模，并研究与SARS-COV-2相关的传播风险。尽管大多数机载液滴的直径为8-16美元，但传输电位最高的液滴实际上是32-40 $μ$ m。因此，建议使用面罩以进行个人和社会保护。我们发现社会距离有效地降低了所有液滴尺寸的传输潜力。但是，1 m远的人体的存在会改变空气动力学，以增强下游液滴分散体，这对排队的安全距离具有影响。基于中位病毒负荷，我们发现平均每咳嗽以1 m距离吸入0.55个病毒拷贝。液滴蒸发会导致液滴计数的显着降低，但即使在低湿度条件下，空气传播也可能存在。
The Covid-19 pandemic has focused attention on airborne transmission of viruses. Using realistic air flow simulation, we model droplet dispersion from coughing and study the transmission risk related to SARS-CoV-2. Although most airborne droplets are 8-16 $μ$m in diameter, the droplets with the highest transmission potential are, in fact, 32-40 $μ$m. Use of face masks is therefore recommended for both personal and social protection. We found social distancing effective at reducing transmission potential across all droplet sizes. However, the presence of a human body 1 m away modifies the aerodynamics so that downstream droplet dispersion is enhanced, which has implications on safe distancing in queues. Based on median viral load, we found that an average of 0.55 viral copies is inhaled at 1 m distance per cough. Droplet evaporation results in significant reduction in droplet counts, but airborne transmission remains possible even under low humidity conditions.
