The outbreak of Corona Virus(COVID-19)has spread over a large number of countries.The virus is typically transported inside liquid droplets produced by human beings.As a result,doctors operating in the consulting room...The outbreak of Corona Virus(COVID-19)has spread over a large number of countries.The virus is typically transported inside liquid droplets produced by human beings.As a result,doctors operating in the consulting rooms of hospitals are potentially exposed to high risk.Taking into account the evaporation of droplets and using a hybrid Eulerian-Lagrangian framework to determine the airflow pattern and corresponding motion of droplets,in the present study,the motion of droplets is investigated with regard to the situation in which doctors check patients in front of their bed.A turbulence model(RNG k-ɛ)is used.The purification capacity of different ventilation systems is compared.The risk of cross-infection between doctors and patients is also evaluated.展开更多
Respiratory viruses can be attached to human exhaled particles and spread from person to person through respiratory activities.The purpose of this study is to obtain the quantitative description formula of human exhal...Respiratory viruses can be attached to human exhaled particles and spread from person to person through respiratory activities.The purpose of this study is to obtain the quantitative description formula of human exhaled particles in the ventilated room through amount number of numerical simulation calculations and regression statistical analysis of the simulated data.In this study,a combination of numerical simulation and laboratory experiments was used,and the results were tallied preferably.Bacillus subtilis was released as a release source to investigate the migration and distribution of bioaerosol.The results show that under the condition of high air supply velocity,due to the disturbance of human respiration and airflow,the diffusion velocity of exhaled particles was faster and the diffusion range is larger than that of low air supply velocity within the same time frame.No matter where the location of the manikin was in the room,the exhaled particles would spread to the whole room in at least 900 s.The method used in this study could be used to predict the distribution of human exhaled particles concentration in different indoor spaces,such as public transport and hospitals.These findings could provide valuable reference for the location of indoor air purifiers,which plays a guiding role in the construction of a healthy indoor environment.展开更多
文摘The outbreak of Corona Virus(COVID-19)has spread over a large number of countries.The virus is typically transported inside liquid droplets produced by human beings.As a result,doctors operating in the consulting rooms of hospitals are potentially exposed to high risk.Taking into account the evaporation of droplets and using a hybrid Eulerian-Lagrangian framework to determine the airflow pattern and corresponding motion of droplets,in the present study,the motion of droplets is investigated with regard to the situation in which doctors check patients in front of their bed.A turbulence model(RNG k-ɛ)is used.The purification capacity of different ventilation systems is compared.The risk of cross-infection between doctors and patients is also evaluated.
基金supported by the National Key R&D Program of China(No.2019YFC1520700)the National Natural Science Foundation of China(No.41977368)+1 种基金the National Science and Technology Ministry of China(No.2017YFC0702800)Opening Funds of State Key Laboratory of Building Safety and Built Environment National Engineering Research Center of Building Technology(No.BSBE2017-08).
文摘Respiratory viruses can be attached to human exhaled particles and spread from person to person through respiratory activities.The purpose of this study is to obtain the quantitative description formula of human exhaled particles in the ventilated room through amount number of numerical simulation calculations and regression statistical analysis of the simulated data.In this study,a combination of numerical simulation and laboratory experiments was used,and the results were tallied preferably.Bacillus subtilis was released as a release source to investigate the migration and distribution of bioaerosol.The results show that under the condition of high air supply velocity,due to the disturbance of human respiration and airflow,the diffusion velocity of exhaled particles was faster and the diffusion range is larger than that of low air supply velocity within the same time frame.No matter where the location of the manikin was in the room,the exhaled particles would spread to the whole room in at least 900 s.The method used in this study could be used to predict the distribution of human exhaled particles concentration in different indoor spaces,such as public transport and hospitals.These findings could provide valuable reference for the location of indoor air purifiers,which plays a guiding role in the construction of a healthy indoor environment.
