Physics of Fluids - Publications

How microstructures affect air film dynamics prior to drop impact

Soft Matter 10, 3703–3707 (2014)

Authors

	Roeland van der Veen
	Maurice H. W. Hendrix
	Tuan Tran
	Chao Sun
	Peichun Amy Tsai
	Detlef Lohse

BibTeΧ

@Article{C4SM00298A,
author ="van der Veen, Roeland C. A. and Hendrix, Maurice H. W. and Tran, Tuan and Sun, Chao and Tsai, Peichun Amy and Lohse, Detlef",
title  ="How microstructures affect air film dynamics prior to drop impact",
journal  ="Soft Matter",
year  ="2014",
volume  ="10",
issue  ="21",
pages  ="3703-3707",
publisher  ="The Royal Society of Chemistry",
doi  ="10.1039/C4SM00298A",
url  ="http://dx.doi.org/10.1039/C4SM00298A",
abstract  ="When a drop impacts a surface{,} a dimple can be formed due to the increased air pressure beneath the drop before it wets the surface. We employ a high-speed color interferometry technique to measure the evolution of the air layer profiles under millimeter-sized drops impacting hydrophobic micropatterned surfaces for impact velocities of typically 0.4 m s-1. We account for the impact phenomena and show the influence of the micropillar spacing and height on the air layer profiles. A decrease in pillar spacing increases the height of the air dimple below the impacting drop. Before complete wetting{,} when the impacting drop only wets the top of the pillars{,} the air-droplet interface deforms in between the pillars. For large pillar heights the deformation is larger{,} but the dimple height is hardly influenced."}