We predict and analyze the drying time of respiratory droplets from a COVID-19 infected subject, which is a crucial time to infect another subject. Drying of the droplet is predicted by using a diffusion-limited evaporation model for a sessile droplet placed on a partially wetted surface with a pinned contact line. The variation in droplet volume, contact angle, ambient temperature, and humidity are considered. We analyze the chances of the survival of the virus present in the droplet based on the lifetime of the droplets under several conditions and find that the chances of the survival of the virus are strongly affected by each of these parameters. The magnitude of shear stress inside the droplet computed using the model is not large enough to obliterate the virus. We also explore the relationship between the drying time of a droplet and the growth rate of the spread of COVID-19 in five different cities and find that they are weakly correlated.

中文翻译：

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冠状病毒在沉积在固体表面的呼吸道飞沫中存活的可能性

我们预测和分析来自 COVID-19 感染对象的呼吸道飞沫的干燥时间，这是感染另一个对象的关键时间。液滴的干燥是通过对放置在具有固定接触线的部分润湿表面上的固着液滴使用扩散限制蒸发模型来预测的。考虑了液滴体积、接触角、环境温度和湿度的变化。我们根据液滴在几种条件下的寿命来分析液滴中存在的病毒的存活机会，并发现病毒的存活机会受到这些参数中的每一个的强烈影响。使用该模型计算出的液滴内部剪切应力的大小不足以消除病毒。