Effects of slope and speed of escalator on the dispersion of cough-generated droplets from a passenger

doi:10.1063/5.0046870

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	Effects of slope and speed of escalator on the dispersion of cough-generated droplets from a passenger
	Li ZB(李曌斌)1,2; Zhang XL(张鑫磊)1,2; Wu T(吴霆)1,2; Zhu LX(朱力行)1,2; Qin JH(秦建华)1,2; Yang XL(杨晓雷)1,2
通讯作者	Yang, Xiaolei(xyang@imech.ac.cn)
发表期刊	PHYSICS OF FLUIDS
	2021-04-01
卷号	33 期号:4 页码:7
ISSN	1070-6631
摘要	During the pandemic of COVID-19, the public is encouraged to take stairs or escalators instead of elevators. However, the dispersion of respiratory droplets in these places, featured by slopes and human motion, is not well understood yet. It is consequently unclear whether the commonly recommended social-distancing guidelines are still appropriate in these scenarios. In this work, we analyze the dispersion of cough-generated droplets from a passenger riding an escalator with numerical simulations, focusing on the effects of the slope and speed of the escalator on the droplet dispersion. In the simulations, a one-way coupled Eulerian-Lagrangian approach is adopted, with the air-flow solved using the Reynolds-averaged Navier-Stokes method and the droplets modeled as passive Lagrangian particles. It is found that the slope alters the vertical concentration of the droplets in the passenger's wake significantly. The deflection of cough-generated jet and the wake flow behind the passenger drive the cough-generated droplets upwards when descending an escalator and downwards when ascending, resulting in both higher suspension height and larger spreading range of the viral droplets on a descending escalator than on an ascending one. These findings suggest that the present social-distancing guidelines may be inadequate on descending escalators and need further investigation.
DOI	10.1063/5.0046870
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000636741100001
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
资助项目	NSFC Basic Science Center Program[11988102]
项目资助者	NSFC Basic Science Center Program
论文分区	一类/力学重要期刊
力学所作者排名	1
RpAuthor	Yang, Xiaolei
引用统计	被引频次：23[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/86453
专题	非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Li ZB,Zhang XL,Wu T,et al. Effects of slope and speed of escalator on the dispersion of cough-generated droplets from a passenger[J]. PHYSICS OF FLUIDS,2021,33,4,:7.
APA	李曌斌,张鑫磊,吴霆,朱力行,秦建华,&杨晓雷.(2021).Effects of slope and speed of escalator on the dispersion of cough-generated droplets from a passenger.PHYSICS OF FLUIDS,33(4),7.
MLA	李曌斌,et al."Effects of slope and speed of escalator on the dispersion of cough-generated droplets from a passenger".PHYSICS OF FLUIDS 33.4(2021):7.

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