Thermal atomisation of a liquid drop after impact onto a hot substrate

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 lame...

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Bibliographic Details
Published in:Journal of fluid mechanics 2018-05, Vol.842, p.87-101
Main Authors: Roisman, I. V., Breitenbach, J., Tropea, C.
Format: Article
Language:English
Subjects:
Atomizing
Disintegration
Drying
Dynamics
Evaporation
Fluids
Heat flux
Heat transfer
JFM Papers
Lamella
Levitation
Phase transitions
Reynolds number
Substrates
Temperature effects
Velocity
Weber number
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Summary: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.
ISSN:0022-1120
1469-7645
DOI:10.1017/jfm.2018.123