Department of Soil Science, Mustafa Kemal University, Antakya, Hatay, Turkey.
Department of Plastic and Reconstructive Surgery, Faculty of Medicine, Alanya Alaaddin Keykubat University, Alanya, Antalya, Turkey.
Environ Monit Assess. 2021 Sep 5;193(10):626. doi: 10.1007/s10661-021-09382-7.
A simplified model has been devised to estimate the falling dynamics of severe acute respiratory syndrome corona-virus 2 (SARS-CoV-2)-laden droplets in an indoor environment. Our estimations were compared to existing literature data. The spread of SARS-CoV-2 is closely coupled to its falling dynamics as a function of respiratory droplet diameter (1 to 2000 μm) of an infected person and droplet evaporation. The falling time of SARS-CoV-2 with a respiratory droplet diameter of about 300 μm from a height of 1.7 m remained almost the same among the Newtonian lift equation, Stokes's law, and our simplified model derived from them so as to account for its evaporation. The evaporative demand peaked at midday which was ten times that at midnight. The evaporating droplets [Formula: see text] 6 μm lost their water content rapidly, making their lifetimes in the air shorter than their falling times. The droplets [Formula: see text] 6 μm were able to evaporate completely and remained in the air for about 5 min as droplet nuclei with SARS-CoV-2.
已设计出一种简化模型来估算 SARS-CoV-2 载飞沫在室内环境中的下降动力学。我们的估算结果与现有文献数据进行了比较。SARS-CoV-2 的传播与其作为感染人呼吸飞沫直径（1 至 2000μm）和飞沫蒸发的函数的下降动力学密切相关。在考虑蒸发的情况下，从 1.7m 高度下落的直径约为 300μm 的 SARS-CoV-2 飞沫的下落时间在牛顿升力方程、Stokes 定律和我们从中推导出来的简化模型之间几乎相同。蒸发需求在中午达到峰值，是午夜的十倍。蒸发的飞沫[公式：见正文]6μm 迅速失去水分，使其在空气中的寿命短于下落时间。直径[公式：见正文]6μm 的飞沫能够完全蒸发，并作为带有 SARS-CoV-2 的飞沫核在空气中停留约 5 分钟。
