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Japanese scientists have found that face shields do not protect against airborne transmission of coronavirus infection.
To do this, the dynamics of the airflow that arises from the sneezes and cough of an infected person next to a person’s face was studied, writes Physics of Fluids.
It turned out that when sneezing in the air, ring-shaped vortices are generated, which are formed when the aerosol is suddenly ejected from the round holes. The vortex captures airborne droplets and particles, including viruses.
Simulations have shown that viruses can travel one meter in 0.5-1 seconds, hitting the top and bottom edges of the flap. Also, if the carrier of the shield inhales, the droplets with the virus will inevitably enter the respiratory system.
The scientists concluded that face shields could be improved to reduce the amount of air that enters them.
As previously reported by OBOZREVATEL, US scientists have found that protective masks with valves and screens are ineffective in protecting against COVID-19 coronavirus infection.
