Drop Impact on Superheated Surfaces

Tuan Tran, Hendrik J.J. Staat, Andrea Prosperetti, Chao Sun, Detlef Lohse

Research output: Contribution to journalArticleAcademicpeer-review

222 Citations (Scopus)
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Abstract

At the impact of a liquid droplet on a smooth surface heated above the liquid’s boiling point, the droplet either immediately boils when it contacts the surface (“contact boiling”), or without any surface contact forms a Leidenfrost vapor layer towards the hot surface and bounces back (“gentle film boiling”), or both forms the Leidenfrost layer and ejects tiny droplets upward (“spraying film boiling”). We experimentally determine conditions under which impact behaviors in each regime can be realized. We show that the dimensionless maximum spreading γ of impacting droplets on the heated surfaces in both gentle and spraying film boiling regimes shows a universal scaling with the Weber number We (γ∼We2/5), which is much steeper than for the impact on nonheated (hydrophilic or hydrophobic) surfaces (γ∼We1/4). We also interferometrically measure the vapor thickness under the droplet
Original languageEnglish
Article number036101
Number of pages5
JournalPhysical review letters
Volume108
Issue number3
DOIs
Publication statusPublished - 2012

Keywords

  • METIS-285890
  • IR-79932

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