Modelling the direct virus exposure risk associated with respiratory events
Journal article, 2022

The outbreak of the COVID-19 pandemic highlighted the importance of accurately modelling the pathogen transmission via droplets and aerosols emitted while speaking, coughing and sneezing. In this work, we present an effective model for assessing the direct contagion risk associated with these pathogen-laden droplets. In particular, using the most recent studies on multi-phase flow physics, we develop an effective yet simple framework capable of predicting the infection risk associated with different respiratory activities in different ambient conditions. We start by describing the math- ematical framework and benchmarking the model predictions against well-assessed literature results. Then, we provide a systematic assessment of the effects of physical distancing and face coverings on the direct infection risk. The present results indicate that the risk of infection is vastly impacted by the ambient conditions and the type of respiratory activity, suggesting the non-existence of a universal safe distance. Meanwhile, wearing face masks provides excellent protection, effectively limiting the transmission of pathogens even at short physical distances, i.e. 1 m.


Jietuo Wang

University of Padua

Federico Dalla Barba

University of Padua

Alessio Roccon

Vienna University of Technology

Gaetano Sardina

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Alfredo Soldati

Vienna University of Technology

Francesco Picano

University of Padua

Journal of the Royal Society Interface

1742-5689 (ISSN) 1742-5662 (eISSN)

Vol. 19 186 20210819-20210819 20210819

Evaporation dynamics of COVID-bearing droplets under different atmospheric conditions

Swedish Research Council (VR) (2020-05861), 2020-08-01 -- 2020-12-31.


Basic sciences

Areas of Advance

Life Science Engineering (2010-2018)

Subject Categories

Fluid Mechanics and Acoustics





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4/6/2022 5