Sharma Meenaxi, Mondal Samrat Sohel, Roy Pritam Kumar, Khare Krishnacharya
Department of Physics, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India.
Department of Physics, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India.
J Colloid Interface Sci. 2020 Jun 1;569:244-253. doi: 10.1016/j.jcis.2020.02.074. Epub 2020 Feb 21.
Lubricating fluid coated slippery (LCS) surfaces offer a new scope to study the evaporation of sessile drops due to pinning free motion of the three-phase contact line (TPCL). This work aims to experimentally demonstrate the different evaporation behavior of water and binary mixture drops on dry and LCS surfaces.
Evaporation study on dry and LCS surfaces is performed by capturing top and side views of evaporating drops to extract various parameters which are subsequently used to distinguish between different evaporation modes.
Formation of a wetting ridge and cloaking of water drops on LCS surfaces affect the overall evaporation process and make it different compared to that on dry surfaces. Evaporation dynamics on LCS surfaces reveal that wetting ridge height of an evaporating drop varies non-monotonically compared to the drop height. Diffusion based theoretical model is used to predict the role of various system parameters on the evaporation process. In contrast to dry solid surfaces, where coffee ring effects are commonly observed towards the end of the evaporation process, LCS surfaces show the formation of a wrinkle like pattern of the lubricating fluid which disappears at long times.
涂有润滑液的光滑（LCS）表面为研究由于三相接触线（TPCL）的无钉扎自由运动导致的固着液滴蒸发提供了新的研究范围。这项工作旨在通过实验证明水和二元混合液滴在干燥和LCS表面上的不同蒸发行为。
通过捕捉蒸发液滴的顶视图和侧视图来进行干燥和LCS表面的蒸发研究，以提取各种参数，随后用于区分不同的蒸发模式。
LCS表面上润湿脊的形成和水滴的包覆影响了整体蒸发过程，使其与干燥表面上的蒸发过程不同。LCS表面上的蒸发动力学表明，与液滴高度相比，蒸发液滴的润湿脊高度呈非单调变化。基于扩散的理论模型用于预测各种系统参数在蒸发过程中的作用。与干燥固体表面不同，在干燥固体表面通常在蒸发过程结束时观察到咖啡环效应，LCS表面显示出润滑液形成皱纹状图案，长时间后消失。
