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Size-dependent spontaneous oscillations of Leidenfrost droplets

Published online by Cambridge University Press:  09 September 2020

Dongdong Liu Open the ORCID record for Dongdong Liu [Opens in a new window]  and
Tuan Tran Open the ORCID record for Tuan Tran [Opens in a new window]
Dongdong Liu
Affiliation:
Mechanical and Aerospace Engineering School, HP-NTU Digital Manufacturing Corporate Lab, Nanyang Technological University, 50 Nanyang Avenue, 639798Singapore, Republic of Singapore
Tuan Tran*
Affiliation:
Mechanical and Aerospace Engineering School, HP-NTU Digital Manufacturing Corporate Lab, Nanyang Technological University, 50 Nanyang Avenue, 639798Singapore, Republic of Singapore
*
†Email address for correspondence: ttran@ntu.edu.sg
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Abstract

A liquid droplet hovering on a hot solid surface is commonly referred to as a Leidenfrost droplet. In this study, we discover that a Leidenfrost droplet spontaneously performs a series of distinct oscillations as it shrinks during the span of its life. The oscillation first starts out erratically, followed by a stage with stable frequencies, and finally turns into periodic bouncing with signatures of a parametric oscillation and occasional resonances. The last bouncing stage exhibits nearly perfect collisions. We showed experimentally and theoretically the enabling effects of each oscillation mode and how the droplet switches between such modes. We finally show that these spontaneous oscillation modes and the conditions for transitioning between modes are universal for all tested combinations of liquids and surfaces.

JFM classification

Drops and Bubbles: Boiling Drops and Bubbles: Drops Drops and Bubbles: Thermocapillarity
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 902 , 10 November 2020 , A21
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Copyright
© The Author(s), 2020. Published by Cambridge University Press

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References

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Liu and Tran supplementary movie 1

A water droplet on a at sapphire surface (T = 300°C) transitions from hovering, to bobbing, and finally bouncing.

Download Liu and Tran supplementary movie 1(Video)
Video 13.3 MB

Liu and Tran supplementary movie 2

A water droplet with radius around capillary length hovering on an aluminium surface at T = 380°C. The movie is corresponding to the snapshots shown in Fig. 1b in main text.

Download Liu and Tran supplementary movie 2(Video)
Video 3.8 MB

Liu and Tran supplementary movie 3

A water droplet showing the bobbing motion, i.e., regular deformation without bouncing motion, on an aluminium surface at T = 380°C. The movie is corresponding to the snapshots shown in Fig. 1c in main text.

Download Liu and Tran supplementary movie 3(Video)
Video 4.3 MB

Liu and Tran supplementary movie 4

A water droplet bouncing on an aluminium surface at T = 380°C. The movie is corresponding to the snapshots shown in Fig. 1d in main text.

Download Liu and Tran supplementary movie 4(Video)
Video 289 KB

Liu and Tran supplementary movie 5

A water droplet bouncing on an aluminium surface at T = 380°C. The movie is corresponding to the snapshots shown in Fig. 1d in main text.

Download Liu and Tran supplementary movie 5(Video)
Video 1 MB