Experimental study of puffing and evaporation of aniline droplet mixed with acetone at relatively low temperature

Abstract

This study investigates the evaporation of aniline droplets experimentally using the suspension technique and studies the impacts of acetone on the evaporation of aniline at temperatures of 200°C and 300°C at an initial droplet size of 2 µl. The complete evaporation process was captured using a high-speed camera operating at 1350 frames per second. Results were compared with the evaporation of the pure aniline droplet. The results showed that the acetone addition markedly increased the evaporation rate and dramatically decreased the aniline droplets’ lifetime. At a temperature of 200°C, the addition of 10% acetone by volume reduced the droplet lifetime by approximately 67% compared to pure aniline. At 300°C with a 5% acetone concentration, the decrease in droplet lifetime was around 45%. In addition, puffing was observed at a 10% acetone concentration, where the droplet lifetime decreased by approximately 59% compared to pure aniline. Based on the research findings, the evaporation process, in this case, can be divided into three discrete stages: transient heating then fluctuation evaporation, and finally equilibrium evaporation. These findings indicate that the presence of acetone has an extreme effect on the aniline evaporation characteristics, even at relatively low ambient temperatures. The dramatic decreases in droplet lifetime suggest that acetone can significantly accelerate its evaporation process.