乘客在火车车厢内接触呼吸道气溶胶的情况:窗户、注入源和输出流位置的影响。

IF 11.7 1区 工程技术 Q1 Engineering
Sustainable Cities and Society Pub Date : 2021-12-01 Epub Date: 2021-08-19 DOI:10.1016/j.scs.2021.103280
Mahdi Ahmadzadeh, Mehrzad Shams
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引用次数: 0

摘要

如今,使用公共交通工具(PT)已被确定为高风险行为,因为受感染乘客携带的冠状病毒颗粒会传播给其他人。本研究提出了一种新的计算框架,用于预测受感染乘客在火车车厢内交谈时产生的液滴在各种情况下的传播,包括流出位置和受感染乘客位置的变化。研究使用了 CFD,使用欧拉-拉格朗日方法捕捉粒子的传播,并使用雷诺平均纳维-斯托克斯方程(RANS)计算气流场。研究结果表明,打开窗户会缩短粒子在域内的持续时间。因此,当窗户打开时,粒子的滞留时间比关闭时减少了 25%。研究发现,坐在受感染乘客旁边的乘客受到感染的风险最高。本文得出的结论表明,无论车窗是关闭还是打开,当受感染乘客坐在出口旁边时,都会出现最理想的情况。本文的研究结果为如何保持室内环境安全、防止感染气溶胶提供了全面的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Passenger exposure to respiratory aerosols in a train cabin: Effects of window, injection source, output flow location.

Passenger exposure to respiratory aerosols in a train cabin: Effects of window, injection source, output flow location.

Passenger exposure to respiratory aerosols in a train cabin: Effects of window, injection source, output flow location.

Passenger exposure to respiratory aerosols in a train cabin: Effects of window, injection source, output flow location.

Nowadays the use of public transportation (PT) has been identified as high risk as due to the transfer of particles carrying the coronavirus from an infected passenger to others. This study puts forward a new computational framework for predicting the spread of droplets produced while the infected passenger talking inside the cabin of a train during various scenarios, including the changes in the outflows' location and the infected passenger's position. CFD was used to conduct the study, using the Euler-Lagrange approach to capture the transmission of particles, and Reynolds-averaged Navier-Stokes equations (RANS) to compute the airflow field. The results revealed that opening the window reduces the duration of particles inside the domain. So that when the window is open, the particle's shelf time can decrease to 25 percent comparing with closed mode. It was found that the passenger sitting next to the infected passenger encountered the highest infection risk. The conclusions made in this work show that the most desirable situation is obtained when the infected passenger is sitting next to the exits, whether the window is closed or open. The results of this paper offer comprehensive insights into how to keep indoor environments safe against infection aerosols.

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来源期刊
Sustainable Cities and Society
Sustainable Cities and Society CONSTRUCTION & BUILDING TECHNOLOGYGREEN &-GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
CiteScore
18.40
自引率
13.70%
发文量
810
期刊介绍: Sustainable Cities and Society (SCS) is an international journal focusing on fundamental and applied research aimed at designing, understanding, and promoting environmentally sustainable and socially resilient cities.
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