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Origin of spray formation during impact on heated surfaces

Abstract

In many applications it is crucial to control the heat transfer rate of impacting drops on a heated plate. When the solid exceeds the so-called Leidenfrost temperature, an impacting drop is pre- vented from contacting the plate by its own evaporation. As the decrease in the resulting cooling efficiency of the impacting drop is yet not quantitatively understood, here we experimentally study the impact of such water drops on smooth heated surfaces of various substances. We demon- strate that, in contrast to previous results for other liquids, water exhibits spray in vertical direction when impacting sapphire and silicon. We show that this typical spray formation during impact is a result of the local cooling of the plate. This is surprising since these two materials were con- sidered to remain isothermal during impact of mm-sized droplets. We conclude and explain that the thermal time scale of the system is not solely determined by the thermal properties of the solid, but also by those of the liquid. We also introduce a dimensionless number comparing the thermal time scale and the dynamic time scale with which we can predict the spraying behaviour at impact.

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Publication details

The article was received on 12 May 2017, accepted on 05 Sep 2017 and first published on 06 Sep 2017


Article type: Paper
DOI: 10.1039/C7SM00956A
Citation: Soft Matter, 2017, Accepted Manuscript
  • Open access: Creative Commons BY license
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    Origin of spray formation during impact on heated surfaces

    M. A. J. van Limbeek, P. Hoefnagels, C. Sun and D. Lohse, Soft Matter, 2017, Accepted Manuscript , DOI: 10.1039/C7SM00956A

    This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

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      [Original citation] - Published by The Royal Society of Chemistry.

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