FIG. 10.

(a) People who use masks reduce respiratory droplet transmission while (partially) isolating themselves from coughing. The findings of a 5 s simulation time for a surgical mask with a 91% initial efficiency are provided. The temperature of the skin of the face is 32 °C, whereas the temperature of the mouth is 34 °C. In this simulation, there is no wind, the ambient temperature is 20 °C, the pressure is 1 atmosphere, and the relative humidity is 50%, (b) Variation of effective dynamic filter efficiency (η) with the number of cycles n of a coughing event, ${\eta }_1=90.4\%$. Reproduced with permission from T. Dbouk and D. Drikakis, “On respiratory droplets and face masks,” Phys. Fluids 32(6), 063303 (2020),⁴³ Copyright 2020 AIP Publishing.