Laurie Garrett has shared a paper from “Physics of
Fluids” by Sanjay Kumar and Heow Pueh Lee, “The perspective of fluid flow behavior
of respiratory droplets and aerosols through the facemasks in the context of SARS-CoV2”,
link Oct. 2016
But in general it discusses how you can predict the
effectiveness of various masks in stopping transmission. Look particularly at
the illustration on p. 32.
Transmission may be enhanced by dry air, which allows
water in droplets to evaporate and for aerosol droplets to become smaller.
Laurie Garrett noted that silk is considered a useful
material in masks.
There is a paper from Canada (Emily Chung et al) recommending
that masks incorporate polypropylene. It is possible to put them into homemade
masks.
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