Numerical investigation of aerosol transport in a classroom with relevance to COVID-19.
Numerical investigation of aerosol transport in a classroom with relevance to COVID-19.
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DOI：
10.1063/5.0029118
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发表时间：
2020-10-01
期刊：
影响因子：
--
通讯作者：
Poroseva SV
中科院分区：
文献类型：
--
作者：
Abuhegazy M;Talaat K;Anderoglu O;Poroseva SV
本研究利用计算流体粒子动力学模拟研究了现实教室环境中的气溶胶传输和表面沉积。探讨了颗粒尺寸、气溶胶源位置、玻璃屏障和窗户的影响。虽然空气中的气溶胶传输表现出一定的随机性，但研究发现，很大一部分 (24%–50%) 小于 15 µm 的颗粒会在 15 分钟内通过空调系统排出系统。大于 20 µm 的颗粒几乎全部沉积在地面、桌子和房间附近的表面上。源位置强烈影响呼出气溶胶颗粒的轨迹和沉积分布，并影响玻璃屏障等缓解措施的有效性。研究发现，玻璃屏障可以将 1 µm 颗粒从源个体到相距至少 2.4 m 的其他个体的气溶胶传输减少约 92%。通过打开窗户，与关闭窗户的情况相比，颗粒物出口分数可增加约 38%，并减少室内人员身上的气溶胶沉积。平均而言，当窗户打开时，约 69% 的 1 µm 颗粒会离开系统。
The present study investigates aerosol transport and surface deposition in a realistic classroom environment using computational fluid-particle dynamics simulations. Effects of particle size, aerosol source location, glass barriers, and windows are explored. While aerosol transport in air exhibits some stochasticity, it is found that a significant fraction (24%–50%) of particles smaller than 15 µm exit the system within 15 min through the air conditioning system. Particles larger than 20 µm almost entirely deposit on the ground, desks, and nearby surfaces in the room. Source location strongly influences the trajectory and deposition distribution of the exhaled aerosol particles and affects the effectiveness of mitigation measures such as glass barriers. Glass barriers are found to reduce the aerosol transmission of 1 µm particles from the source individual to others separated by at least 2.4 m by ∼92%. By opening windows, the particle exit fraction can be increased by ∼38% compared to the case with closed windows and reduces aerosol deposition on people in the room. On average, ∼69% of 1 µm particles exit the system when the windows are open.
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