Transport of aerosol by coughing in an air-conditioned space

Bo Zhang, Guangyu Guo, Chao Zhu, Zhiming Ji

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Aerosol generated from a human cough can be a major indoor health risk to surrounding individuals and even spread out via air-ventilation systems. This study aims to investigate the transport trajectory characteristics of coughed aerosols under the influence of ambient conditioned air ventilation as well as near-by humans. In this paper, a transient three-dimensional multiphase multi-component Eulerian-Lagrangian model has been established, which is numerically solved using commercial ANSYS Fluent code. The multi-component gas phase includes air and water vapor, while the multiphase is composed of a continuous phase of the gas mixture and a discrete phase of liquid aerosols. The coughed aerosols are modeled by defining its chemical components, size distribution, and evaporation property to mimic the actual situation. With this computational fluid dynamics (CFD) model, the indoor transport of coughed aerosols can be determined, particularly, the distributions of portions inhaled by individual person, deposited on surfaces of human body/wall/floor/ceiling, and re-circulated into the ventilation system. Results show that the coarse droplets affect most for human dummy in front of the coughing subject. Most fine aerosol droplets end up on the surface of four walls plus ceiling and floor. It also depicts that air circulation intensity could be a strong factor of influencing the aerosol transport.

Original languageEnglish (US)
Title of host publication4th Thermal and Fluids Engineering Conference, TFEC 2019
PublisherBegell House Inc.
Pages1341-1353
Number of pages13
ISBN (Electronic)9781567004724
DOIs
StatePublished - 2019
Event4th Thermal and Fluids Engineering Conference, TFEC 2019 - Las Vegas, United States
Duration: Apr 14 2019Apr 17 2019

Publication series

NameProceedings of the Thermal and Fluids Engineering Summer Conference
Volume2019-April
ISSN (Electronic)2379-1748

Conference

Conference4th Thermal and Fluids Engineering Conference, TFEC 2019
CountryUnited States
CityLas Vegas
Period4/14/194/17/19

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Electrical and Electronic Engineering
  • Fluid Flow and Transfer Processes
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment

Keywords

  • Aerosol
  • CFD
  • Cough
  • Eulerian-Lagrangian
  • Multi-component
  • Multiphase
  • Numerical simulation

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