Droplet bounce simulations and air pressure effects on the deformation of pre-impact droplets, using a boundary element method

Hongbok Park; Sam S. Yoon; Richard A. Jepsen; Stephen D. Heister; Ho Y. Kim

doi:10.1016/j.enganabound.2007.07.002

Droplet bounce simulations and air pressure effects on the deformation of pre-impact droplets, using a boundary element method

Hongbok Park, Sam S. Yoon, Richard A. Jepsen, Stephen D. Heister, Ho Y. Kim

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

An inviscid axisymmetric model capable of predicting both droplet bounce and the detailed pre-impact motion that is influenced by ambient pressure has been developed using a boundary element method (BEM). Previous simulations could not accurately describe the effect of the gas compressed between a falling droplet and the impacting substrate because most droplet impact simulations assumed that the droplet was already in contact with the impacting substrate at the beginning of the simulation. To properly account for the surrounding gas, the simulation must begin when the droplet is released from a certain height. High pressures are computed in the gas phase in the region between the droplet and the impact surface at instances just prior to impact. This simulation shows that the droplet retains its spherical shape when the surface tension energy is dominant over the dissipative energy. When the Weber number is increased, the droplet's surface structure is highly deformed due to the presence of capillary waves and, consequently, a pyramidal surface structure is formed. This phenomenon was verified experimentally. Parametric studies using our model include the pre-impact behavior that varies as a function of the Weber number and the surrounding gas pressure.

Original language	English
Pages (from-to)	21-31
Number of pages	11
Journal	Engineering Analysis with Boundary Elements
Volume	32
Issue number	1
DOIs	https://doi.org/10.1016/j.enganabound.2007.07.002
Publication status	Published - 2008 Jan

Bibliographical note

Funding Information:
The authors gratefully acknowledge the support of Sandia National Laboratories (SNL) under Grant No. LDRD05-0030. SNL is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company for the United States Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. The second author acknowledges his thanks for the partial support provided by Carbon Dioxide Reduction and Sequestration R;D Center (CDRS) of Korea.

Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.

Keywords

Bouncing droplet
Compressed gas
Droplet impact
Splashing
Two-phase flow

ASJC Scopus subject areas

Analysis
General Engineering
Computational Mathematics
Applied Mathematics

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10.1016/j.enganabound.2007.07.002

Cite this

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title = "Droplet bounce simulations and air pressure effects on the deformation of pre-impact droplets, using a boundary element method",

abstract = "An inviscid axisymmetric model capable of predicting both droplet bounce and the detailed pre-impact motion that is influenced by ambient pressure has been developed using a boundary element method (BEM). Previous simulations could not accurately describe the effect of the gas compressed between a falling droplet and the impacting substrate because most droplet impact simulations assumed that the droplet was already in contact with the impacting substrate at the beginning of the simulation. To properly account for the surrounding gas, the simulation must begin when the droplet is released from a certain height. High pressures are computed in the gas phase in the region between the droplet and the impact surface at instances just prior to impact. This simulation shows that the droplet retains its spherical shape when the surface tension energy is dominant over the dissipative energy. When the Weber number is increased, the droplet's surface structure is highly deformed due to the presence of capillary waves and, consequently, a pyramidal surface structure is formed. This phenomenon was verified experimentally. Parametric studies using our model include the pre-impact behavior that varies as a function of the Weber number and the surrounding gas pressure.",

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note = "Funding Information: The authors gratefully acknowledge the support of Sandia National Laboratories (SNL) under Grant No. LDRD05-0030. SNL is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company for the United States Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. The second author acknowledges his thanks for the partial support provided by Carbon Dioxide Reduction and Sequestration R;D Center (CDRS) of Korea. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

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AU - Kim, Ho Y.

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Droplet bounce simulations and air pressure effects on the deformation of pre-impact droplets, using a boundary element method

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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