Health
Why masks with exhalation valves do not delay the spread of COVID-19
among COVID-19 PandemicIf you go out wearing a valve mask that you purchased to deal with pollution, you should consider changing it. Scientists used high-speed video of the airflow to show why masks with exhalation valves do not slow the spread of COVID-19.
Researchers at the National Institute of Standards and Technology (NIST) in the United States have produced a video showing the pattern of airflow through the mask with and without an exhalation valve.
Matthew Staymates, a research engineer at NIST, the corresponding author of a study published in the journal Physics of Fluids, said the differences were noticeable while comparing the videos side-by-side.
“These videos show how valves can expel air. mask Without filtering, the purpose of the mask is defeated, “says Staymates.
“Valve masks work against pollution, not COVID-19”
If the mask is intended to protect the wearer, the researchers said an exhalation valve that facilitates breathing and makes the mask more comfortable is appropriate.
For example, a mask with a valve can protect workers from dust on construction sites and hospital workers from infected patients.
Staymates created two videos using different flow visualization techniques. The first video was created using what is called a Schlieren imaging system. This causes the difference in air density to appear on the camera as a shadow and light pattern.
The system is warmer and less dense than the surrounding air, so you can see the exhaled air.
Staymates created a second video using light scattering technology
He created a device that expels air at the same speed and tempo as a resting adult, and connected the device to a mannequin.
As a substitute for exhaled droplets, air carries water droplets within the size of typical droplets that are released during breathing when people exhale, talk, or cough.
The high brightness LED light behind the mannequin air The droplets scatter the light and appear bright on the camera.
In contrast to the Schlieren video, this video shows the movement of droplets in the air. Droplets escape unfiltered through the valve on the N95 mask.
Using a mannequin and a mechanical breathing device, the staymate was able to observe airflow patterns while keeping respiratory rate, barometric pressure, and other variables constant.
Global experts warn against valve masks
Centers for Disease Control and Prevention (CDC) recommends cloth maskBecause the cotton layer can prevent potentially infectious respiratory droplets from entering and exiting. According to the CDC, these valves reduce heat and moisture inside the mask, making them more comfortable to wear for extended periods of time. However, this design cannot prevent the spread of infectious diseases. According to the CDC, the main reason for wearing a mask during the COVID-19 era is to prevent respiratory droplets from moving into the air during coughing, sneezing, and conversation. However, if the mask has a valve, respiratory droplets from the wearer can be released into the air and reach others.
The total number of cases confirmed in India exceeds 870,000 rupees
At 44,879 New coronavirus infection In the last 24 hours, 547 people have died, with a total of 87,28,795 for India on Friday and tolls reaching 1,28,688. Currently, there are 4,84,547 active cases, but so far 81,15,580 patients have been cured and discharged. The recovery rate is 92.97% and the case fatality rate is 1.47%.
(With input from the agency)
Published: November 13, 2020, 10:14 am | Updated: November 13, 2020, 10:45 am
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