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Wetting characteristics of a water droplet on solid surfaces with various pillar surface fractions under different conditions

Research paper by Min Jung Yoo, Matthew Stanley Ambrosia; Tae Woo Kwon; Joonkyung Jang; Man Yeong Ha

Indexed on: 03 May '18Published on: 01 Apr '18Published in: Journal of Mechanical Science and Technology



Abstract

A numerical study was carried out using a molecular dynamics program to examine the wetting characteristics of nano-sized water droplets on surfaces with various pillar surface fractions under different conditions. Square-shaped pillars had surface fractions that increased from 11.1 % to 69.4 %. The pillars had 4 different heights and 3 different surface energies. When the pillar surface fraction changed, the contact angle of a water droplet also changed due to the attraction between the droplet and the pillar surface or the inner attraction of the water molecules. The pillar height also has different effects on the water droplet depending on the magnitude of surface energy.