Open AccessNumerical investigation of aerosol transport in a classroom with relevance to COVID-19
Author(s) -
Mohamed Abuhegazy,
Khaled Talaat,
Osman Anderoglu,
Svetlana V. Poroseva
Publication year - 2020
Publication title -
physics of fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.188
H-Index - 180
eISSN - 1089-7666
pISSN - 1070-6631
DOI - 10.1063/5.0029118
Subject(s) - aerosol , particle (ecology) , deposition (geology) , physics , meteorology , atmospheric sciences , mechanics , paleontology , oceanography , sediment , biology , geology
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 µ m exit the system within 15 min through the air conditioning system. Particles larger than 20 µ m 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 µ m 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 µ m particles exit the system when the windows are open.