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SPLASHING PHENOMENA DURING LIQUID DROPLET IMPACT

Authors
Liu, JieVu, HenryYoon, Sam S.Jepsen, RichardAguilar, Guillermo
Issue Date
2010
Publisher
BEGELL HOUSE INC
Keywords
droplet; impact; splash; instability; splash threshold
Citation
ATOMIZATION AND SPRAYS, v.20, no.4, pp.297 - 310
Indexed
SCIE
SCOPUS
Journal Title
ATOMIZATION AND SPRAYS
Volume
20
Number
4
Start Page
297
End Page
310
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/118542
DOI
10.1615/AtomizSpr.v20.i4.30
ISSN
1044-5110
Abstract
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.
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