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Star-shaped oscillations of Leidenfrost drops

Xiaolei Ma*, Juan-José Liétor-Santos, and Justin C. Burton

  • Department of Physics, Emory University, Atlanta, Georgia 30322, USA

  • *xiaolei.ma@emory.edu
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Phys. Rev. Fluids 2, 031602(R) – Published 31 March, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.031602

Abstract

We experimentally investigate the self-sustained, star-shaped oscillations of Leidenfrost drops. The drops levitate on a cushion of evaporated vapor over a heated, curved surface. We observe modes with n=2–13 lobes around the drop periphery. We find that the wavelength of the oscillations depends only on the capillary length of the liquid and is independent of the drop radius and substrate temperature. However, the number of observed modes depends sensitively on the liquid viscosity. The dominant frequency of pressure variations in the vapor layer is approximately twice the drop oscillation frequency, consistent with a parametric forcing mechanism. Our results show that the star-shaped oscillations are driven by capillary waves of a characteristic wavelength beneath the drop and that the waves are generated by a large shear stress at the liquid-vapor interface.

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References (37)

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Outline

Information

Phys. Rev. Fluids 2, 031602(R)– Published 31 March, 2017
  • Received 17 May 2016
  • Revised 16 September 2016
Article part of CHORUS

©2017 American Physical Society

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