Downward jetting of a dynamic Leidenfrost drop

Sang-Hyeon Lee, Maaike Rump, Kirsten Harth, Minwoo Kim, Detlef Lohse, Kamel Fezzaa, and Jung Ho Je
Phys. Rev. Fluids 5, 074802 – Published 17 July 2020
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Abstract

Jetting is a universal phenomenon frequently observed in nature and industries, for instance, in rain drop impact, inkjet printing, spray cooling, fuel atomization, etc. In drop impact on a superheated surface, we observe the formation of a vapor cavity beneath the dynamic Leidenfrost drop and a consecutive downward ejection of a jet into the cavity using ultrafast x-ray phase contrast imaging. We reveal that the cavity is induced mostly by the retraction of the drop and the jetting is caused by the convergence of capillary waves along the liquid-cavity interface. We find a jetting criterion based on the viscous damping of capillary waves: [OhWe2]66±10. These results can provide important insight that leads to understanding and modeling of jets in nature.

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  • Received 13 January 2020
  • Accepted 16 June 2020

DOI:https://doi.org/10.1103/PhysRevFluids.5.074802

©2020 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

Sang-Hyeon Lee1, Maaike Rump2, Kirsten Harth2,3, Minwoo Kim1, Detlef Lohse2,4, Kamel Fezzaa5, and Jung Ho Je1,*

  • 1X-ray Imaging Center, Department of Materials Science and Engineering, Pohang University of Science and Technology, Cheongam-Ro, Nam-Gu, Pohang 37673, Republic of Korea
  • 2Physics of Fluids, University of Twente, 7500NB Enschede, The Netherlands
  • 3Institute of Physics, Otto von Guericke University Magdeburg, 39106 Magdeburg, Germany
  • 4Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany
  • 5X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA

  • *jhje@postech.ac.kr

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Issue

Vol. 5, Iss. 7 — July 2020

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