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Atomization and Sprays
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ISSN Druckformat: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v20.i4.30
pages 297-310

SPLASHING PHENOMENA DURING LIQUID DROPLET IMPACT

Jie Liu
Department of Mechanical Engineering, University of California-Riverside, USA
Henry Vu
Department of Mechanical Engineering, University of California-Riverside, Riverside, USA , Advatech Pacific, Incorporated, Advanced Technology Division, Palmdale, California 93550, USA
Sam S. Yoon
Mechanical Engineering Department, Korea University, Anamdong, 5-Ga, Sungbukgu, Seoul, 136-713, Korea
Richard A. Jepsen
Mechanical Environments, Sandia National Laboratory, P.O. Box 5800, Albuquerque, New Mexico 87185-1135, USA
Guillermo Aguilar
Department of Mechanical Engineering, University of California-Riverside, Riverside, California 92507, USA

ABSTRAKT

Splashing is a phenomenon often observed during liquid droplet impact onto a solid surface. The threshold of splashing is known to be related to droplet size, impact velocity, and physical properties of the liquid, but the mechanisms that initiate splashing are not understood completely. In accordance with the Kelvin-Helmholtz (K-H) instability analysis, recent studies have shown that ambient gas density has a significant effect on the threshold and trajectory of splashing. In this study, the effects of droplet velocity, impact angle, and ambient gas pressure (or density) on the threshold of splashing and the motion of the ambient gas surrounding the droplet were examined. Experimental observations of splashing were carried out with a droplet of 1.7 mm in diameter, while varying droplet velocity, impact angle, and ambient pressure. An empirical correlation was derived using our and other published data to determine the threshold of splashing based on the aforementioned parameters. Also, a numerical simulation using the volume of fluid method was carried out to calculate the gas velocities surrounding the droplet during impact. The results of this model gave supportive evidence that K-H instability is a suitable instability theory that helps explain the splash phenomenon with consideration of the gas motion surrounding the droplet.