Abstract
The differentially weighted operator-splitting Monte Carlo (DWOSMC) method is further developed to describe the droplet aerosol dynamic behaviors, including coagulation, deposition, condensation, and evaporation processes. It is first proposed that the droplet aerosols will experience firstly condensation and then evaporation, and this phenomenon is first implemented into the Monte Carlo method and sectional method with considering coagulation, deposition, and condensation/evaporation processes in both single-component and two-component aerosol particle systems. It is found that the calculated results of the DWOSMC method agree well with both the analytical solutions and the sectional method. The further developed DWOSMC method can predict the variation of particle number density, total particle volume, mean particle diameter, particle size distributions, and the component-related particle volume densities in both single component and two-component droplet aerosol systems considering coagulation, deposition, and condensation/evaporation processes.
Highlights
Respiratory infections caused by droplet aerosol transmission are major killers of humans
In single component aerosol systems, the particles can be regarded as water droplets that condense or evaporate; in two-component aerosol systems, besides water, the droplet aerosols contain compositions that do not evaporate, which could be regarded as a solid condensation nucleus
Coagulation and Condensation/Evaporation Processes in Single Component Aerosol Systems In Cases I and II, the initial particles have a uniform diameter of 1.5μm and the differentially weighted operator-splitting Monte Carlo (DWOSMC) method is validated by analytical solutions [39,40]
Summary
Respiratory infections caused by droplet aerosol transmission are major killers of humans. Droplet aerosols will experience a series of dynamical behaviors, such as coagulation, deposition, condensation, and evaporation processes, which significantly affect the particle size distributions and the transportation mechanism of aerosols [7,8,9,10]. Another characteristic of droplet aerosols is that they cannot be regarded as singlecomponent particles. The evolutionary process of the droplet aerosols is complicated and the study of the propagation and spread process, 4.0/)
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