that’s a paper on a fluid dynamical model of how masks might work, and the theoretical filtration rates of the model. they didn’t test mask efficiency against c

that’s a paper on a fluid dynamical model of how masks might work, and the theoretical filtration rates of the model. they didn’t test mask efficiency against covid. it’s a neat application of navier-stokes and computational fluid dynamics, but not too relevant to mask effectiveness and public health policy in real-world applications.