Health
Masks made of woven are poor air filters
Like many other viruses, COVID-19 is transmitted primarily through particles carried into the air. An infected person can exhale particles containing the virus into the air, which can be inhaled by another person to become infected.
Masks are widely considered as an important front-line defense against aerial transmission of illness, as supported by the predominance of evidence. Inspired by Omicron variants, the latest wave of pandemics urged public health officials to recommend a more protective face covering, as not all masks are made the same. ..
of Fluid physicsAIP Publishing, UK, Germany, France researchers Focus their expertise (and their microscope) on the investigation Effectiveness of Unlike the materials used in standard air filters and masks, particle filtration with a woven fabric that twists fibers into threads. Therefore, there are two length scales. The diameter of the fiber and thread.
Scientists use confocal microscope-generated 3D images to identify channels of air flow, simulate air flow through these channels, and filter efficiency for particles larger than 1 micrometer in diameter. To calculate. The study concludes that filtration efficiency is low for particles in this size range.
Masks are air filters, and textiles such as cotton make good jeans, shirts, and other apparel, but they are poor air filters. Therefore, use textiles for clothing and N95 or FFP2 or KF94 for masks. “
Richard Shear, co-author of Sally University
Indeed, flow simulations suggest that when a person breathes through a cloth, most of the air flows through the gaps between the yarns of the fabric, resulting in more than 90% of the particles.
“In other words, these relatively large gaps are what makes cloth a bad material for making air filters,” Sear said. “In contrast, the filter layer of the N95 mask is made of much smaller 5 micrometer fibers with a one-tenth gap, which filters annoying particles in the air, such as particles containing viruses. Much more suitable for. “
Previous studies have revealed similar findings, but this is the first study to simulate particles that pass directly through the crevices of a fabric.
A good mask added by Sear should have “two Fs: good filtration and good fit”.
“The poor fit of the surgical mask causes more air to pass through the edges of the mask on the cheeks and nose,” says Sear.
sauce:
Journal reference:
Under, IR, et al. (2022) Modeling the filtration efficiency of textiles: the role of multiple length scales. Fluid physics. doi.org/10.1063/5.0074229..
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