London, May 20: The current physical distancing guidelines of 6 feet may be insufficient to prevent COVID-19 transmission, according to a study which says a mild cough in low wind speeds can propel saliva droplets by as much as 18 feet.
Researchers, including those from the University of Nicosia in Cyprus, said a good baseline for studying the airborne transmission of viruses, like the one behind the COVID-19 pandemic, is a deeper understanding of how particles travel through the air when people cough.
In the study, published in the journal Physics of Fluids, they said even with a slight breeze of about four kilometres per hour (kph), saliva travels 18 feet in 5 seconds.
"The droplet cloud will affect both adults and children of different heights," said study co-author Dimitris Drikakis from the University of Nicosia.
According to the scientists, shorter adults and children could be at higher risk if they are located within the trajectory of the saliva droplets.
They said saliva is a complex fluid, which travels suspended in a bulk of surrounding air released by a cough, adding that many factors affect how saliva droplets travel in the air.
These factors, the study noted, include the size and number of droplets, how they interact with one another and the surrounding air as they disperse and evaporate, how heat and mass are transferred, and the humidity and temperature of the surrounding air.
In the study, the scientists created a computer simulation to examine the state of every saliva droplet moving through the air in front of a coughing person.
The model considered the effects of humidity, dispersion force, interactions of molecules of saliva and air, and how the droplets change from liquid to vapour and evaporate, along with a grid representing the space in front of a coughing person.
Each grid, the scientists said, holds information about variables like pressure, fluid velocity, temperature, droplet mass, and droplet position.
The study analysed the fates of nearly 1,008 simulated saliva droplets, and solved as many as 3.7 million equations.
"The purpose of the mathematical modelling and simulation is to take into account all the real coupling or interaction mechanisms that may take place between the main bulk fluid flow and the saliva droplets, and between the saliva droplets themselves," explained Talib Dbouk, another co-author of the study.
However, the researchers added that further studies are needed to determine the effect of ground surface temperature on the behaviour of saliva in air.
They also believe that indoor environments, especially ones with air conditioning, may significantly affect the particle movement through air.
This work is important since it concerns safety distance guidelines, and advances the understanding of the transmission of airborne diseases, Drikakis said.
Comments
Dear Shobha Karandlaje. This victim is a Beary. So kindly don’t include his name in your prolonged list of slain Hindu karyakarthas.
No anna the killers of RAO are BJP workers (minority sect) but BJP moved...this killer is a paid hitman,
Lesson for All Rowdy if we play with other life one day our life will end .. like tiz..
THAQDHEER BANA NE WALA KAM NAHEEN ! JIS KO KYA MILA WO MUQADDAR KI BAAT HAI
Cops wanted him dead.
That’s why he got bail.
Anyway this is a cleanup drive.
So many cases against him, really a big threat to the mangalore. Good Decision by police department :P
Inna Lillahi wa inna ilayhi raji'un,
Notorious rowdy died a dog’s death!
This may be the preplanned murder, big question is how he can get bail so soon.
No He was gang leader of Target Group.
Inna Lillahi wa inna ilayhi raji'un, how can he get bail so soon, need to question our Constituency?
out of contest! in mangalore no ending of murder?
Inna lillahi wa inna ilayhi raji'un, May allah grant him Jannah
Inna Lillahi wa inna ilayhi raji'un, dear brothers this s eye opener incident to all, pls leave peacefully.
is this same guy who killed Deepak Rao?
Youth dont understand the situation in mangalore. for every start thr will be a bad ending.
he recieved what he wanted.
Really sad but he was really a threat to the society.
Inna Lillahi wa inna ilayhi raji'un
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