Fig. 2.

Boundary conditions of a transient mass flow rate and a droplet initial size distribution are applied at the mouth opening. (a) Coughing flow rate profile reproduced from Gupta et al. (2009) and (b) expelled coughing droplet size distribution reproduced from Chao et al. (2009). The range of the droplet initial size adopted in this study is 1–100 $\mathrm{\mu }\mathrm{m}$.