par Mekhitarian, Loucine ;Sobac, Benjamin ;Dehaeck, Sam ;Haut, Benoît ;Colinet, Pierre
Référence Europhysics letters, 120, 1, page (16001)
Publication Publié, 2017-12-18
Référence Europhysics letters, 120, 1, page (16001)
Publication Publié, 2017-12-18
Article révisé par les pairs
Résumé : | 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. |