Impact of a compound drop on a dry surface

• Published in: Journal of mechanical science and technology 2007-11, Vol.21 (11), p.1886-1891, Article 1886
• Main Authors: CHEN, R. H, KUO, M. J, CHIU, S. L, PU, J. Y, LIN, T. H
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Deposition; Drops (liquids); Drops and bubbles; Drying; Exact sciences and technology; Fluid dynamics; Fluid surfaces and fluid-fluid interfaces; Fundamental areas of phenomenology (including applications); Interface activity, spreading; Liquids; Mass ratios; Nonhomogeneous flows; Physics; Quartz; Shells; Solid surfaces; Surface energy (surface tension, interface tension, angle of contact, etc.); Surface tension; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Weber number
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/BF03177445

The impact of a water-in-oil compound drop on a dry quartz surface was studied. The impact outcomes depended on a core-to-overall mass ratio and a Weber number. For a Weber number less than 570 and a core-to-overall mass ratio ranging from 0.07 to 0.7, five collision patterns were observed: complete deposition, shell deposition with core partial rebound, shell splash with core-shell deposition, shell splash with core partial rebound, and shell splash with core-shell partial rebound. Past research has indicated that the splash phenomenon depends strongly on liquid properties such as surface tension and viscosity in addition to the properties of the solid surface and the surrounding gas. The liquid properties in a compound drop were made non-uniform by the presence of additional interfaces in the interior of the liquid drop.