Nanobubbles have attracted much attention in recent years due to their special physiochemistry properties and shown significant potential application in droplet evaporation. However, there is a lack of research on the mechanism of the nanobubble influencing droplet evaporation. To address this problem, the coarse-grained molecular dynamics simulation method is employed to reveal the mechanism underlying the role of nanobubbles in influencing the droplet evaporation. And this model visualizes the varies in nanobubbles during the evaporation. The results indicate that the evolution pathways of nanobubbles inside droplets mainly include two modes: diffusion and micro-explosion, and the transition between these two modes is synergistically regulated by nanobubble size and ambient temperature. By a quantitative analysis based on the evaporation constant, it is found that nanobubbles exhibit an enhancing effect on the evaporation rate. This effect becomes more pronounced with the increase in ambient temperature, and is most significant in large-sized nanobubbles under high-temperature conditions. This research provides theoretical support for the application of nanobubbles in fuel atomization and enhanced heat and mass transfer.

Nanobubble, Droplet evaporation, Evaporation constant, Coarse-grained molecular dynamics