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Building better air filters can help stop the next pandemic. At the 74th Annual Meeting of the APS Division of Fluid Dynamics, scientists will present the latest results on how the mask might work in the future, what happens when the mask gets wet, and why incorrect use of a mask is sometimes worse than not wearing a mask.
They will announce the survey results and answer questions from reporters at a real-time virtual press conference to be held on Tuesday, November 23, 2021, from 12:00 pm to 1:00 pm in Mountain Standard Time (MST).
Before the masks of the future are ready to be worn, scientists from the University of California, San Diego, the Indian Institute of Science and the University of Toronto have thoroughly studied what makes our current masks functional or risky.
Abhishek Saha, an engineering professor at the University of California, San Diego, wanted to solve a simple but common problem: wet masks.
What will happen to the efficacy of wearing a mask for a long time? In fact, due to the condensation in our breath, the mask will gradually become wet. Will it affect the performance? "
Abhishek Saha, Professor of Engineering, University of California, San Diego
Saha will show the new findings of an experiment that tested two different types of masks getting wet gradually. He will share whether gradual wetting will reduce the mask's ability to capture respiratory droplets. In addition, he will discuss how wearing a mask for a long time will affect the fit between the mask and the face, which may cause side leakage.
Physical Review Fluids will announce the results of the wet mask soon.
In a recent paper, the researchers also reported on dry masks. “Due to gravity, large respiratory droplets usually fall on the ground quickly, so they are considered less harmful. But for dry masks, we found that large respiratory droplets can penetrate the mask matrix and produce many small droplets. , Thereby extending the life in the air," Saha said. "Incorrect masking can cause these large droplets to atomize."
At the same time, other scientists have turned to design a different type of filtration system.
Majed Jafar, a student in the Department of Mechanical Engineering at South Dakota State University, said: "Inspired by the tortuous animal nasal cavity, we designed a new filter channel that can filter particles in the air and operate under a relatively low pressure gradient, which is energy consumption. Measurement standards." Diab, he will introduce this research.
Through CT scans, scientists spied inside the noses of pigs, dogs, possums, guinea pigs and rabbits, as well as Australian marsupials: a kitten called the northern kangaroo, a large glider that likes eucalyptus, and a mouse-like The feline potoroo is a creature related to kangaroos.
The researchers then designed and 3D printed the filter-which requires less effort to inhale air than today's masks-and tested it in a wind tunnel.
Saikat Basu, a professor from South Dakota, said: “In addition to the application in mask covers, the bionic concept of filters can also be used to design large baffles for industrial applications. Generally speaking, they can promote air in confined, crowded spaces. Health." State University in collaboration with Diab.
The project was co-directed by Basu, Sunny Jung of Cornell University and Leonardo Chamorro of the University of Illinois at Urbana-Champaign.
At the meeting, the team will show the new results of applying a temperature gradient along the surface of the filter, which helps inactivate captured virus particles.
Another team from Purdue University and the National Autonomous University of Mexico also designed a reusable virus-killing mask.
The layer of the Hy-Cu filter includes a copper mesh with a diamond-like carbon coating, which can inactivate the virus in just a few hours. It can be attached to any cloth mask or scarf, making the filter more consumer-friendly.
Purdue University graduate Tanya Purwar said: "The Hy-Cu filter is easy to breathe, making cloth masks safer, reusable and sustainable-this is a wise alternative to disposable masks that cause a lot of waste every day. Experimental fluid mechanics For professional students, he will present preliminary research results.
Purwar and collaborators tested new filters and disposable masks to combat the live MS2 virus. They will report new data that Hy-Cu filters can kill viruses better than disposable masks. This experiment verified previous computer predictions about the availability of filters.
"This new filter has been tested for virus inactivation for more than two hours and has shown significant results compared to the control," Purwar said.
Bagchi, S. etc. (2021) Affect the penetration and secondary atomization of droplets of wet masks. Physical examination fluid. https://journals.aps.org/prfluids/accepted/d107fS0eT7f10109110330f4bae7b00a7446193d3.
Posted in: Equipment/Technical News | Medical News
Tags: Respiratory, Copper, CT, Efficacy, Pandemic, Research, Respiratory Tract, Virus
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