Behavior of an Evaporating Water Droplet on Lubricant-Impregnated Nano-Structured Surface

Document Type

Article

Publication Date

3-6-2018

Publication Title

Experimental Thermal and Fluid Science

Volume

96

First page number:

216

Last page number:

223

Abstract

The behavior of an evaporating water droplet on lubricant-impregnated nano-structured surface (LINS) was investigated experimentally. For comparison, the flat hydrophobic surface (FHS) and superhydrophobic nano-structured surface (SHNS) were also prepared and tested. The initial water contact angles (WCAs) of LINS, FHS, and SHNS showed 108° 103° and 153° respectively, and their WCA hysteresis (WCAH) were 2° 30° and 23° respectively. During the evaporation of water droplet, FHS showed a typical constant contact radius (CCR) mode. On the contrary, SHNS and LINS showed more complicated mixed mode. These differences of evaporation modes were closely related to the total evaporation time. Initial WCA of LINS was between FHS and SHNS, but the water droplet on LINS showed the longest total evaporation time in the test surfaces. This may be because LINS has the water droplet of the high aspect ratio during the evaporation and the low thermal effusivity. In such a case, the large height of water droplet plays a role to the longer thermal resistance path, which can result in extending the total evaporation time.

Keywords

(Super)hydrophobic surface; Liquid-impregnated nano-structured surface; Water contact angle hysteresis; Water droplet evaporation

Disciplines

Engineering

Language

english

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