Numerical Study on the Evaporation Process of Binary Droplets in the Smoke Agent System

Qianshan Xu
School of Chemistry Engineering, East China University of Science and Technology, Shanghai 200237, Shanghai, China
Yuan Zong
School of Chemistry Engineering, East China University of Science and Technology, Shanghai 200237, Shanghai, China
Ling Zhao
School of Chemistry Engineering, East China University of Science and Technology, Shanghai 200237, Shanghai, China

Abstract:

This study employs computational fluid dynamics (CFD) to investigate the evaporation process of the smoke agent system consisting of propylene glycol (PG) and water, aiming to explore the selective evaporation phenomenon and its key influencing factors during the smoking process. The results show that: (1) In the free evaporation process of the binary droplets, due to the differences in evaporation temperatures of the components, the component with a lower evaporation temperature dominates the evaporation process, exhibiting distinct selective evaporation characteristics (2) Increasing the heating temperature of the base plate and the initial water content significantly enhances the evaporation rate; (3) in a porous medium, the evaporation rate of the smoke agent increases significantly, and increases the porosity  can effectively Improve the evaporation rate. These findings provide theoretical support for regulating the evaporation behavior of smoke agents and improving smoke output.