Experimental study on the evaporating progress of hexane lens on immiscible liquid：Spreading and receding

¹ Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin, 300134, China
² International Centre in Fundamental and Engineering Thermophysics, Tianjin University of Commerce, Tianjin, 300134, China
³ LMT/ENS-Cachan/CNRS, Paris-Saclay University, 61 Avenue du Président Wilson, 94235 France, China

^* Corresponding author: lbtjcu@tjcu.edu.cn Tel：+86 189 2019 7448

Abstract

The change of evaporation liquid on another immiscible liquid has important guiding significance for many applications. In this experiment, the geometric temperature distribution and evaporation rate of n-hexane droplets were observed and recorded by changing the temperature of deionized water. The results show that with the increase of temperature of deionized water-based solution, the maximum diameter of n-hexane droplet spreading after titration increases gradually, while the minimum diameter of n-hexane droplet disappearing decreases gradually. Meanwhile, the evaporation rate of n-hexane droplet is constant during the whole evaporation process. It should also be mentioned that if the base solution is changed from deionized water to a certain concentration of salt solution, the maximum diameter of n-hexane droplet spreading will be reduced, and the evaporation intensity will be relatively reduced. These experimental results will give us a better understanding of the mechanism and characteristics of droplet evaporation.