期刊
JOURNAL OF FLUID MECHANICS
卷 842, 期 -, 页码 87-101出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2018.123
关键词
boiling; breakup/coalescence; drops
资金
- German Research Foundation (Deutsche Forschungsgemeinschaft) [SFB-TRR 75]
This experimental study is focused on the mechanisms of thermal atomisation of a drop impacting onto a hot substrate. This phenomenon is characterised by the wetting and dewetting of the substrate, caused not by the rim dynamics, but induced by thermal effects. These thermal effects lead to the lamella evaporation, levitation and disintegration, generation of a vertical spray of fine droplets and consequently, drop breakup. A typical contact time of the drop before complete detachment is theoretically estimated. This estimation agrees very well with the experiments. It is shown that the Weber number, often used for describing splashing drops, is not a relevant parameter for thermal atomisation. Finally, a regime map is plotted, using a combination of the dimensionless contact time and the dimensionless heat flux at the substrate.
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