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Numerical Study on Air Entrapment in Droplets under Impact onto a Solid Surface

Presentation held at 25th ILASS-Europe, Crete (Chania), Greece, 2013
 
: Ye, Qiaoyan; Tiedje, Oliver

:
Fulltext urn:nbn:de:0011-n-2597350 (1.0 MByte PDF)
MD5 Fingerprint: 359c4dbff8f18d5cab991fd37fe53476
Created on: 9.10.2013


2013, 7 pp.
European Conference on Liquid Atomization and Spray Systems (ILASS) <25, 2013, Chania, Kreta>
English
Presentation, Electronic Publication
Fraunhofer IPA ()
Lufteinschluss; numerische Simulation; Tropfenaufprall; numerisches Verfahren; simulation; Beschichtung

Abstract
Air entrapment in droplets under impact onto a dry smooth solid surface was numerically investigated using three-dimensional computational domain with high-resolution grid. The study was focused on the drop spreading phase without splash and break-up. We present detailed numerical observations of the velocity and pressure distributions, as well as the initial air disc formed at the impact point. Results of numerical simulations indicate that the initial size of the air disc is independent of the drop properties and the impact velocity. However, the maximal size of the enlarged air disc during the first advancing scenario depends on the Oh and Re numbers, especially for viscous droplets. The air disc contracts into micro bubbles. The simulations also show the bubble release processes. The effects of the bubble release from the liquid film were discussed.

: http://publica.fraunhofer.de/documents/N-259735.html