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

Published online by Cambridge University Press:  06 March 2018

I. V. Roisman Open the ORCID record for I. V. Roisman [Opens in a new window] ,
J. Breitenbach Open the ORCID record for J. Breitenbach [Opens in a new window]  and
C. Tropea
I. V. Roisman*
Affiliation:
Technische Universität Darmstadt, Institute for Fluid Mechanics and Aerodynamics, Alarich-Weiss-Straße 10, 64287 Darmstadt, Germany
J. Breitenbach
Affiliation:
Technische Universität Darmstadt, Institute for Fluid Mechanics and Aerodynamics, Alarich-Weiss-Straße 10, 64287 Darmstadt, Germany
C. Tropea
Affiliation:
Technische Universität Darmstadt, Institute for Fluid Mechanics and Aerodynamics, Alarich-Weiss-Straße 10, 64287 Darmstadt, Germany
*
†Email address for correspondence: [email protected]
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Abstract

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.

JFM classification

Drops and Bubbles: Boiling Drops and Bubbles: Breakup/coalescence Drops and Bubbles: Drops
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 842 , 10 May 2018 , pp. 87 - 101
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Copyright
© 2018 Cambridge University Press 

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