Study of expiratory droplet dispersion and transport using a new Eulerian modeling approach
Study of expiratory droplet dispersion and transport using a new Eulerian modeling approach
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DOI：
10.1016/j.atmosenv.2007.05.045
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发表时间：
2007-11-01
影响因子：
5
通讯作者：
Cheng, Y. C.
中科院分区：
文献类型：
--
作者：
Lai, Alvin C. K.;Cheng, Y. C.
了解飞沫核的扩散和传输特性可以为控制空气传播疾病提供更多的工程策略。模拟了常规混合式置换通风条件下室内液滴的分散情况。选择0.01和10 μ m两种液滴核，因为它们代表非常细和粗糙的液滴。流场建模采用k-epsilon RNG模型。采用了一种新的欧拉漂移通量方法来模拟液滴相。在常规通风方案下，细液滴和粗液滴在大约50秒内均匀分散。液滴核表现出独特的分散行为，特别是在低气流微环境中。液滴喷射270 s后，重力沉降对10 μ m液滴色散有影响，置换通风仍可观察到浓度梯度。(C) 2007 Elsevier Ltd.版权所有。
Understanding of droplet nuclei dispersion and transport characteristics can provide more engineering strategies to control transmission of airborne diseases. Droplet dispersion in a room under the conventional well-mixed and displacement ventilation is simulated. Two droplet nuclei sizes, 0.01 and 10 mu m, are selected as they represent very fine and coarse droplets. The flow field is modeled using k-epsilon RNG model. A new Eulerian drift-flux methodology is employed to model droplet phase. Under the conventional ventilation scheme, both fine and coarse droplets are homogeneously dispersed within approximately 50 s. Droplet nuclei exhibit distinctive dispersion behavior, particularly for low airflow microenvironment. After 270 s of droplet emission, gravitational settling influences the dispersion for 10 mu m droplets, and concentration gradient can still be observed for displacement ventilation. (C) 2007 Elsevier Ltd. All rights reserved.