报告人：周同明 教授 西澳大学

时间：2023年12月23日上午9：00-12：00

地点：线上（腾讯会议链接：888-969-940）

报告题目：Evaluation of high flow local extraction for controlling aerosol plumes in operating theatres and ICU

专家简介：

Professor Tongming Zhou has been in the area of fluid dynamics for more than 20 years. He obtained his PhD in 1999 in the area of Fluid Mechanics from The University of Newcastle (Australia). After completing his PhD, he worked as a post-doctoral fellow for about 2 years and then joined Nanyang Technological University, Singapore, as an assistant/associate professor. Since July 2007, he has been working in Department of Civil, Environmental and Mining Engineering, The University of Western Australia. His main research interests include (1) suppression of vortex shedding and VIV using various passive methods to reduce hazards; (2) enhancement of vortex-induced vibrations (VIV) and galloping of bluff structures to increase fluid energy harnessing efficiency; (3) resonance of waves in the gap between a floating LNG facility and a LNG carrier; (4) liquid sloshing in a partially-filled tank by conducting experiments on the hexapod.

报告摘要：

SARS-CoV-2 can be transmitted through contact with fomite, respiratory droplets, and aerosolized viruses. Evidence suggests that aerosol transmission represents a significant route of infection. In relation to healthcare workers (HCWs), much attention has been focused on personal protective equipment (PPE), yet this is the lowest level of controls. Although engineering controls are prominent in the hierarchy, little attention has been given to develop effective interventions. This study aims to evaluate the performance of a simple extraction device in a clinical setting by using a high flow local extraction (HFLE). It was connected to the existing ventilation system of the hospital. Propylene glycol was aerosolized through a physiological test apparatus to simulate the breath of a patient. The field of interest was illuminated using a laser sheet in two planes from the model, namely, the sagittal plane and the transverse plane, and the movement of the simulated aerosol was recorded using a video camera to assess the dispersion of the aerosol qualitatively. In the meantime, the concentration of the aerosol particles was measured using a particle meter to evaluate the effectiveness of the extraction quantitatively. It was found that the HFLE device could effectively reduce the dispersion of the exhaled aerosols to undetectable levels when it was positioned within 250mm from the mouth. This result has significance in the safety of HCWs involved in the management of patients with infectious diseases and may also have potential applications in other clinical areas with high airflow in the ventilation systems.