Zheng Minfeng, Fan Yaming, Li Xiangdong, Lester Daniel, Chen Xin, Li Yiyu, Cole Ivan
Fujian Eco-materials Engineering Research Center, Fujian University of Technology, Fuzhou, 350118, PR China.
College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou, 350118, PR China.
Build Environ. 2023 Aug 1;241:110486. doi: 10.1016/j.buildenv.2023.110486. Epub 2023 Jun 1.
It is now widely recognised that aerosol transport is major vector for transmission of diseases such as COVID-19, and quantification of aerosol transport in the built environment is critical to risk analysis and management. Understanding the effects of door motion and human movement on the dispersion of virus-laden aerosols under pressure-equilibrium conditions is of great significance to the evaluation of infection risks and development of mitigation strategies. This study uses novel numerical simulation techniques to quantify the impact of these motions upon aerosol transport and provides valuable insights into the wake dynamics of swinging doors and human movement. The results show that the wake flow of an opening swinging door delays aerosol escape, while that of a person walking out entrains aerosol out of the room. Aerosol escape caused by door motion mainly happens during the closing sequence which pushes the aerosols out. Parametric studies show that while an increased door swinging speed or human movement speed can enhance air exchange across the doorway, the cumulative aerosol exchange across the doorway is not clearly affected by the speeds.
现在人们普遍认识到，气溶胶传播是新冠病毒等疾病传播的主要途径，量化建筑环境中的气溶胶传播对于风险分析和管理至关重要。了解在压力平衡条件下门的运动和人体移动对载有病毒的气溶胶扩散的影响，对于评估感染风险和制定缓解策略具有重要意义。本研究采用新颖的数值模拟技术来量化这些运动对气溶胶传播的影响，并为旋转门的尾流动力学和人体移动提供了有价值的见解。结果表明，旋转门打开时的尾流会延迟气溶胶逸出，而人走出时的尾流会将气溶胶带出房间。门的运动导致的气溶胶逸出主要发生在关门过程中，此时会将门推出去。参数研究表明，虽然门的旋转速度或人体移动速度的增加可以增强门道处的空气交换，但门道处气溶胶的累积交换并未明显受到速度的影响。
