| 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
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| Corresponding Author | Yang, Xiaolei([email protected]) |
| Source Publication | PHYSICS OF FLUIDS
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| 2021-04-01 | |
| Volume | 33Issue:4Pages:7 |
| ISSN | 1070-6631 |
| Abstract | 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 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000636741100001 |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Funding Project | NSFC Basic Science Center Program[11988102] |
| Funding Organization | NSFC Basic Science Center Program |
| Classification | 一类/力学重要期刊 |
| Ranking | 1 |
| Contributor | Yang, Xiaolei |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/86453 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 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 |
| Recommended Citation 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.Rp_Au:Yang, Xiaolei |
| 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. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Jp2021F175.pdf（4107KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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