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Atomization and Sprays

Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

Institutional price:	$787.00
Issues per year:	8

Best Paper Award Selection - Editorial Board Site

2001, Volume11

98 pages

Issue price - $75.00

OUTCOMES FROM A DROP IMPACT ON SOLID SURFACES

R. Rioboo
TU Darmstadt, 30 Petersenstr., 64287 Darmstadt, Germany

Cam Tropea
Chair of Fluid Mechanics and Aerodynamics (SLA), TU Darmstadt, Germany, Petersenstr. 30, D-64287 Darmstadt, Germany

Marco Marengo
Engineering Faculty, University of Bergamo, viale Marconi 5, 24044 Dalmine, Italy

ABSTRACT

A qualitative analysis of the various outcomes of a drop impact on solid surfaces with different roughness and wettability is carried out. Water, ethanol, different mixtures of glycerin and water, liquid alloys, and silicone oil were used to provide a wide range of material properties such as surface tension, viscosity, and density. The impact velocity was varied by moving the drop generator vertically with respect to tie plate. Also two drop diameter classes were considered. A variation of roughness amplitude and wavelength was achieved using a laser ablation process on polyvinyl chloride and glass substrates, creating a deterministic microstructure. A highly nonwettable rough surface was prepared with alkylketene dimer (AKD) [1]. A first classification of the different outcomes, in terms of splash, rebound, partial rebound, deposition, and other features, is presented.