Volume 120, Number 1, October 2017
|Number of page(s)
|Condensed Matter: Structural, Mechanical and Thermal Properties
|18 December 2017
Evaporation dynamics of completely wetting drops on geometrically textured surfaces
Université libre de Bruxelles, TIPs (Transfers, Interfaces and Processes) - Avenue F.D. Roosevelt, 50, CP 165/67, 1050 Brussels, Belgium
Received: 11 July 2017
Accepted: 22 November 2017
This study deals with the evaporation dynamics of completely wetting and highly volatile drops deposited on geometrically textured but chemically homogeneous surfaces. The texturation consists in a cylindrical pillars array with a square pitch. The triple line dynamics and the drop shape are characterized by an interferometric method. A parametric study is realized by varying the radius and the height of the pillars (at fixed interpillar distance), allowing to distinguish three types of dynamics: i) an evaporation-dominated regime with a receding triple line; ii) a spreading-dominated regime with an initially advancing triple line; iii) a cross-over region with strong pinning effects. The overall picture is in qualitative agreement with a mathematical model showing that the selected regime mostly depends on the value of a dimensionless parameter comparing the time scales for evaporation and spreading into the substrate texture.
PACS: 68.03.Fg – Evaporation and condensation of liquids / 47.55.nd – Spreading films / 47.55.D- – Drops and bubbles
© EPLA, 2017
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