id author title date pages extension mime words sentences flesch summary cache txt cord-254894-ta7hebbg Balachandar, S. Host-to-Host Airborne Transmission As a Multiphase Flow Problem For Science-Based Social Distance Guidelines 2020-09-04 .txt text/plain 17085 863 57 In this paper, we discuss the processes of droplet generation by exhalation, their potential transformation into airborne particles by evaporation, transport over long distances by the exhaled puff and by ambient air turbulence, and final inhalation by the receiving host as interconnected multiphase flow processes. (ii) A first-order mathematical framework that describes the evolution of the cloud of respiratory droplets and their conversion to droplet nuclei, as a function of time, and (iii) A simple description of the inhalability of the aerosols along with the corresponding evaluation of the effectiveness of different masks based on existing data reported to date. ./cache/cord-254894-ta7hebbg.txt ./txt/cord-254894-ta7hebbg.txt