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Thin film instability driven dimple mode of air film failure during drop impact on smooth surfaces

Lige Zhang, Tejaswi Soori, Arif Rokoni, Allison Kaminski, and Ying Sun*

  • Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, Pennsylvania 19104, USA

  • *ys347@drexel.edu
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Phys. Rev. Fluids 6, 044002 – Published 12 April, 2021

DOI: https://doi.org/10.1103/PhysRevFluids.6.044002

Abstract

Air film stability underneath a drop is crucial for drop contact dynamics upon impact. An unstable film leads to the drop contacting the surface and subsequent spreading or splashing. Apart from previously reported film and kink contact modes, here we present the experimental evidence for a dimple failure mode of an air film, driven by a thin film instability when a drop impacts onto an atomically smooth surface. The dimple failure occurs beyond the inertial-capillary timescale and is initiated when the dimple inverts at the drop's central axis. For the same impact Weber number, the dimple failure observed in low-viscosity drops is absent at a higher viscosity, due to damping of capillary waves.

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Outline

Information

Phys. Rev. Fluids 6, 044002– Published 12 April, 2021
  • Received 28 August 2020
  • Accepted 23 March 2021
Article part of CHORUS
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