NDLI: Characterizing exhaled airflow from breathing and talking.

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Characterizing exhaled airflow from breathing and talking.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Gupta, Jitendra K. Lin, Chao-Hsin Chen, Qingyan
Description	Country affiliation: United States Author Affiliation: Gupta JK ( National Air Transportation Center of Excellence for Research in the Intermodal Transport Environment, School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette, IN 47906-2088, USA.)
Abstract	UNLABELLED: The exhaled air of infected humans is one of the prime sources of contagious viruses. The exhaled air comes from respiratory events such as the coughing, sneezing, breathing and talking. Accurate information on the thermo-fluid characteristics of the exhaled airflow can be important for prediction of infectious disease transmission. The present study developed a source model to provide the thermo-fluid conditions of the exhaled air from the breathing and talking processes. The source model is a set of equations obtained from the measurements of the flow rate, flow direction, and area of mouth/nose opening with human subjects. It was found that the exhaled flow rate over time can be represented as a sinusoidal function for breathing and a constant for talking. The flow rates can be calculated by physiological parameters of a subject. The direction of the exhalation jet did not vary much between subjects and the area of mouth/nose opening could be regarded as a constant. Though the mouth/nose opening size varied among subjects, they were not correlated with the physiological parameters of the subjects. If combined with appropriate virus and droplet distribution information, the model can be used to describe the disease source due to breathing and talking. PRACTICAL IMPLICATIONS: Accurate prediction of airborne disease transmission, and the infection prone zones, can aid in identifying and implementing the control strategies. With the recent advancements, Computational Fluid Dynamics (CFD) has become a powerful tool in predicting the disease transmission. Accurate prediction of the transmission by these CFD simulations requires information on sources and sinks of infectious viruses and models for dispersion of these viruses. The exhaled air of an infected human is one of the prime sources of disease viruses. In the present study, measurements of the flow were conducted on human subjects to develop models for the flow boundary conditions for the exhalation and inhalation during breathing and talking.
File Format	HTM / HTML
ISSN	09056947
Issue Number	1
Volume Number	20
e-ISSN	16000668
Journal	Indoor Air
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2010-02-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Environmental Health Disease Transmission, Infectious Exhalation Physiology Speech Female Humans Male Particulate Matter Analysis Journal Article
Content Type	Text
Resource Type	Article
Subject	Building and Construction Public Health, Environmental and Occupational Health Environmental Engineering

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