Characteristics of a free-falling single-droplet of water-in-oil emulsion broken up by a pulse laser

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Water-emulsified oils have been used in a variety of combustion systems, and their atomization characteristics have been studied to control combustion. In particular, many studies have been conducted on micro-explosions, in which an emulsion droplet is broken up into a number of smaller fragments mainly due to phase change of dispersed micro-scale water droplets. In this study, the breakup phenomena of a free-falling single droplet of water-emulsified liquid-fuels (n-decane, n-dodecane, and n-hexadecane) were investigated experimentally. The external energy of a pulse laser was introduced into the emulsion droplet, after which the dynamic response of the emulsion droplet were examined. It was found that the breakup trends were different depending on parameters such as oil type, oil concentration, and laser energy. The dynamic behaviors were categorized into four regimes, and their criteria were related to the effective Weber number of the emulsion droplets. Their physical characteristics are discussed and some empirical relationships are suggested regarding configurational characteristics such as the swelling scale of a liquid membrane, the number of secondary droplets, and the droplet diameter.
Publisher
ELSEVIER SCI LTD
Issue Date
2020-03
Language
English
Article Type
Article
Citation

FUEL, v.264

ISSN
0016-2361
DOI
10.1016/j.fuel.2019.116863
URI
http://hdl.handle.net/10203/271658
Appears in Collection
ME-Journal Papers(저널논문)
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