Infection control measures for public transportation derived from the flow dynamics of obstructed cough jet

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • C. T. Wang
  • J. C. Xu
  • K. C. Chan
  • H. H. Lee
  • Christopher Y.H. Chao
  • S. C. Fu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number105995
Journal / PublicationJournal of Aerosol Science
Volume163
Online published1 Apr 2022
Publication statusPublished - Jun 2022

Abstract

During the COVID-19 pandemic, WHO and CDC suggest people stay 1 m and 1.8 m away from others, respectively. Keeping social distance can avoid close contact and mitigate infection spread. Many researchers suspect that suggested distances are not enough because aerosols can spread up to 7–8 m away. Despite the debate on social distance, these social distances rely on unobstructed respiratory activities such as coughing and sneezing. Differently, in this work, we focused on the most common but less studied aerosol spread from an obstructed cough. The flow dynamics of a cough jet blocked by the backrest and gasper jet in a cabin environment was characterized by the particle image velocimetry (PIV) technique. It was proved that the backrest and the gasper jet can prevent the front passenger from droplet spray in public transportation where maintaining social distance was difficult. A model was developed to describe the cough jet trajectory due to the gasper jet, which matched well with PIV results. It was found that buoyancy and inside droplets almost do not affect the short-range cough jet trajectory. Infection control measures were suggested for public transportation, including using backrest/gasper jet, installing localized exhaust, and surface cleaning of the backrest.

Research Area(s)

  • COVID-19, Gasper jet, Jet interaction, Particle image velocimetry, Public transport

Citation Format(s)

Infection control measures for public transportation derived from the flow dynamics of obstructed cough jet. / Wang, C. T.; Xu, J. C.; Chan, K. C. et al.
In: Journal of Aerosol Science, Vol. 163, 105995, 06.2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review