Distribution of droplet aerosols generated by mouth coughing and nose breathing in an air-conditioned room

Zhang, Yixian; Guo, Feng; Bi, Yang; Yue, Cai Xu; Zhang, Zheng; Cao, Guangyu

doi:10.1016/j.scs.2019.101721

Cited by 97 publications

(91 citation statements)

References 29 publications

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“…Additionally, the number and density of patients in the ICU at Jiangjunshan Hospital were much lower than those at other hospitals, indicating a markedly reduced risk of SARS-CoV-2 contamination in the environment. Moreover, many studies have shown that factors such as temperature and humidity can affect the spread of the virus in enclosed indoor environments ( Feng, Bi, Zhang, Cai, & Huang, 2020 ; Zhang et al, 2019 ). Some studies reported that the rate in which SARS-CoV-2 spread was accelerated in cold and dry conditions (Casanova, Jeon, Rutal, Weber, & Sobsey, 2010; Chin, Chu, Perera, Hui, & Poon, 2020).…”

Section: Discussionmentioning

confidence: 99%

SARS-CoV-2 presented in the air of an intensive care unit (ICU)

Jin

Yang³

et al. 2021

Sustainable Cities and Society

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Section: Discussionmentioning

confidence: 99%

SARS-CoV-2 presented in the air of an intensive care unit (ICU)

Jin

Yang³

et al. 2021

Sustainable Cities and Society

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“…For the thorough cleaning of the ventilation, the influence of particles carried in the MV system on the experimental results can be ignored. The aerosol concentration of the test points with a size of 1 μm size should be ensured to be lower than the background concentration of 0.03 mg/m 3 before each experiment [ 34 ]. 7388AGS is taken as the aerosol generation system in this experiment, which can generate particles from 0.1 to 10 μm in diameter.…”

Section: Experimental Methodsmentioning

confidence: 99%

Experimental and numerical study on the transport of droplet aerosols generated by occupants in a fever clinic

Zhou

Shen

2021

Building and Environment

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The outbreak of the corona virus disease 2019 (COVID-19) infection has spread to a large number of countries worldwide. The early diagnosis of COVID-19 is complicated by its strong transmission characteristics and no obvious symptoms in the incubation period. Due to the relatively sealed indoor environment and the existing ventilation system, the patients and doctors in the fever clinics of the major hospitals are faced with a huge risk of infection. This study aims to investigate the transport of droplet aerosols generated by both doctors and patients to seek measures to reduce the risk of infection. Taking a typical fever clinic as an object of study, two links in the actual diagnosis and treatment process are selected in this manuscript for investigation by experimental and numerical methods. The effects of different cases of coughing and talking, as well as different contact distances, on the inhalation rate of human droplet aerosols are studied. The purification capacity of the ventilation is evaluated by the analysis results of the particle diffusion track and regional concentration of the entire indoor area and breathing zones. The results show that purification of the same number of droplet aerosols and purification by ventilation work better for coughing than for talking. The best ventilation performance appeared for the case of a patient sitting and coughing (PSC), while the case of a patient lying and talking (PLT) was the worst. Corresponding measures are suggested to improve the air purification effect and reduce the risk of cross infection.

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“…The CFD software ANSYS 17.0 was utilized to simulate the breathing airflow and the aerodynamic effects of human TP. The setting of nostril boundary conditions is crucial to the outcome of respiratory airflow (Zhang et al, 2019). Gupta, Lin, and Chen (2010) measured the nostril area of the human body as 0.56 ± 0.1 cm 2 , respiratory volume as 13.33 L/min, and the respiratory frequency as 12/min.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Study on the motion law of aerosols produced by human respiration under the action of thermal plume of different intensities

Guo

Zhang

et al. 2020

Sustainable Cities and Society

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Predicting influence of human thermal plume on the diffusion of respiration-produced particles is an important issue for improving indoor air quality through eliminating infectious microbes efficiently. In this study, the Large Eddy Simulation was utilized to predict the effects of thermal plume of different intensities on particle diffusion. Three postures of the human body model and three room temperatures were considered. The results show that the convective heat transfer coefficient on the surface of the human body varies greatly with different postures. The coefficient is the largest when the model is in sitting posture, leading to the greatest heat transfer rate. Meanwhile, the thermal plume generated by bending the thigh increases the size of the facial thermal plume in horizon direction. The increase of the difference between indoor temperature and skin temperature causes an increase of the convective heat transfer of the manikin, leading to stronger airflow in front of the face. The thicker and faster the human thermal plume is, the more difficult it is penetrated by aerosols produced by nasal breathing, finally resulting in most particles distributed within 0.2 m thick under the roof.

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Distribution of droplet aerosols generated by mouth coughing and nose breathing in an air-conditioned room

Cited by 97 publications

References 29 publications

SARS-CoV-2 presented in the air of an intensive care unit (ICU)

SARS-CoV-2 presented in the air of an intensive care unit (ICU)

Experimental and numerical study on the transport of droplet aerosols generated by occupants in a fever clinic

Study on the motion law of aerosols produced by human respiration under the action of thermal plume of different intensities

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