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.
Highlights
Droplet evaporation is a common phenomenon in nature
We can find that the change of the diameter of n-hexane lens can be divided into three stages: 1) spreading stage, which is similar to the change of droplet shape on the solid plane
It can be found that the evolution pattern of the diameter of n-hexane lens is very similar at different base liquid temperatures
Summary
Droplet evaporation is a common phenomenon in nature. It is of great significance to study it. Pujado et al analyzed the effect of line tension at the three-phase line of lens on liquid surface, and constructed an approximate calculation method for the geometric structure of lens considering this factor[14]. It was found that the shape of lens was mainly affected by the surface tension, and the contact angle would change with the volume of lens due to the flexibility of the base liquid interface[16].Burton et al developed a Mathematica program based on Young−Laplace equation to analyze lens geometry of liquid[17], and this lens profile calculator, together with a measurement of the lens radius for a known volume, provides a simple and convenient method of determining the spreading coefficient (S) of a liquid lens system. Nikolov et al reviewed the related research of liquid lens, proposed an accurate method to measure the three-phase contact angle of micro lens by using reflected light interference, verified the effectiveness of Neumann rule for micro lens, and evaluated the three-phase contact angle and the radius of upper and lower interfaces of two kinds of (spreading and non spreading) lens[3]
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