Scholarlink

<p>The purpose of the present study is to explore the spread and distribution of droplet aerosols generated by a teacher in ventilated classrooms, which is important for understanding how infectious bacteria and viruses spread among people through respiratory activities. The large eddy simulation (LES) coupled with Lagrangian method is used in the simulation and experimental verification is carried out in an artificial climate chamber. The electromagnetic relay valve is innovatively installed in the aerosol transport pipeline to simulate the real human respiration process.The effects of ambient temperature, relative humidity, three respiratory behaviors and displacement ventilation mode on the spread of droplet aerosol are studied. The results show that the influence of ambient temperature on the evaporation rate of droplet aerosols in the classroom is greater than that of the relative humidity. Without ventilation, students in the front of the classroom are at higher risk for inhalation of pollutants when speaking, and students in the back of the classroom are at higher risk for inhalation of pollutants when coughing. The airflow from displacement ventilation has a significant effect on the blocking and removal of particles. Droplet aerosol removal rate for the coughing condition is 87%, which is the highest in comparison to breathing and speaking, while the particle removal rate is 60% for breathing and 79% for speaking. Unremoved particles are blocked and suspended away from the student’s breathing zone.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A Study of the Transportation and Evaporation of a Teacher’s Respiratory Droplet Aerosols in a Ventilated Classroom

  • 期刊论文

  • 发表日期：

    2025年4月12日

查看全文
  • Hongmei Liu,
  • Mu Chen,
  • Qing Zhang,
  • Xiao Jiang,
  • Xuedong Liu

摘要

The purpose of the present study is to explore the spread and distribution of droplet aerosols generated by a teacher in ventilated classrooms, which is important for understanding how infectious bacteria and viruses spread among people through respiratory activities. The large eddy simulation (LES) coupled with Lagrangian method is used in the simulation and experimental verification is carried out in an artificial climate chamber. The electromagnetic relay valve is innovatively installed in the aerosol transport pipeline to simulate the real human respiration process.The effects of ambient temperature, relative humidity, three respiratory behaviors and displacement ventilation mode on the spread of droplet aerosol are studied. The results show that the influence of ambient temperature on the evaporation rate of droplet aerosols in the classroom is greater than that of the relative humidity. Without ventilation, students in the front of the classroom are at higher risk for inhalation of pollutants when speaking, and students in the back of the classroom are at higher risk for inhalation of pollutants when coughing. The airflow from displacement ventilation has a significant effect on the blocking and removal of particles. Droplet aerosol removal rate for the coughing condition is 87%, which is the highest in comparison to breathing and speaking, while the particle removal rate is 60% for breathing and 79% for speaking. Unremoved particles are blocked and suspended away from the student’s breathing zone.