This behind-the-scenes video shows a device set up by Matt Staymates, which he uses to show how masks can stop the spread of COVID-19.
News Report-Washington, November 10, 2020-If you see someone wandering in a grocery store or elsewhere, wearing a mask with a valve, and want to know how safe it is for you, then you deserve attention.
Matthew Staymates, a mechanical engineer and fluid dynamicist at the National Institute of Standards and Technology, is studying different mask types to determine which one can best reduce disease transmission.
In “Fluid Physics” by AIP Publishing, he described exploring the basic flow dynamics of N95 masks with or without exhalation valve. To this end, he generated amazing videos from Schlieren imaging, a method of visualizing fluid flow and light scattering away from the surface of an object.
The exhalation valve on the N95 mask is designed to improve user comfort by reducing the filtering resistance during exhalation.
Staymates said: “When you exhale, a small flap is basically opened, so that the air is emitted without filtering through the mask material.” “I can visually show the working principle of the exhalation valve, and compare it with no such valve. The N95 was compared.”
Staymates said his research shows that N95 masks with exhalation valves are not suitable for filtering out respiratory droplets from people.
He said: “Our current understanding is that part of COVID-19 is spread by respiratory droplets, so during this pandemic, N95 with a valve is not conducive to source control.”
He found that the N95 mask without valve can effectively prevent most liquid droplets from penetrating the mask material.
Staymates has established an exquisite all-weather laboratory in his woodworking workshop to test different types of masks and materials. He created an artificial exhalation system to imitate the exhalation flow pattern of real people, and created a customized pneumatic velocimeter to measure his own breathing flow curve. He used this data as a standard for the artificial exhalation system.
Staymates said: “I also designed and built a custom fog generator inside the mannequin head. The fog generator provides droplets that are very similar to those scattered by humans.” Exhale, and the mist generator essentially makes it look like it’s just smoking a cigarette.”
He said that the use of schlieren imaging and other flow visualization technologies “will continue to help us better understand how masks and face masks play a role in the spread of this disease.” “I hope this work will help make the audience aware In the process of our joint response to this global pandemic, the valves with masks will not help.”
Matthew Staymates wrote “Flow visualization using schlieren imaging and light scattering on N95 respirators with and without exhalation valve”. It will appear in “Physics of Fluids” on November 10, 2020 (DOI: 10.1063/ 5.0031996). After that date, you can visit https://aip.scitation.org/doi/10.1063/5.0031996.
Fluid Physics is dedicated to the publication of original theories, calculations and experimental contributions to gas, liquid and complex fluid dynamics. See https://aip.scitation.org/journal/phf.
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A study by the UCLA Field School of Public Health found that even a simple cloth mask can reduce the spread of COVID-19 respiratory droplets by 77%.
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Post time: Nov-12-2020
