Experimental observation of the development of two droplets of methanol in array on Teflon surface

Abstract

An experiment of the development of two pure methanol droplets in array with different distances and sizes was investigated by the camera of DSA100 (Droplet Shape Analyzer). The contact angle and the baseline were recorded. Compared with the development of one droplet, the development is dependent on the distance between the two droplets and the cap ratio of the two droplets. It was observed that there were three distinct stages as the development of one droplet: the constant contact-angle stage (CA), the constant contact baseline stage (CD) or pinned triple-line stage, and the transition stage (TS) between CA and CD. The evaporation of the droplets in array will increase with the increasing of the distance between the two droplets and the decreasing of the cap ratio of the two droplets. The development of the two droplets in array also shows a characteristic of a lower evaporation rate and a shorter time of CA stage than that of single droplet. During the cross area, there is a negative effect on the evaporation of the droplets.