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  • Letter

How roughness and thermal properties of a solid substrate determine the Leidenfrost temperature: Experiments and a model

Yuki Wakata1, Ning Zhu1, Xiaoliang Chen1, Sijia Lyu1, Detlef Lohse2,3,*, Xing Chao1,†, and Chao Sun1,4,‡

  • 1Center for Combustion Energy, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, 100084 Beijing, China
  • 2Physics of Fluids Group, MESA+ Institute and J. M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands
  • 3Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany
  • 4Department of Engineering Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing 100084, China

  • *d.lohse@utwente.nl
  • †chaox6@tsinghua.edu.cn
  • ‡chaosun@tsinghua.edu.cn
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Phys. Rev. Fluids 8, L061601 – Published 8 June, 2023

DOI: https://doi.org/10.1103/PhysRevFluids.8.L061601

Abstract

In this Letter, we systematically investigate the Leidenfrost temperature for hot solid substrates with various thermal diffusivities and surface roughnesses. Based on the experimental results, we build a phenomenological model that considers the thermal diffusivity of a solid substrate and derive a relationship between the surface roughness and the resulting vapor film thickness. The generality of this model is supported by experimental data for different liquids and solid substrates. Our model thus allows for a theoretical prediction of the Leidenfrost temperature and develops a comprehensive understanding of the Leidenfrost effect.

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Phys. Rev. Fluids 8, L061601– Published 8 June, 2023
  • Received 9 August 2022
  • Revised 23 February 2023
  • Accepted 24 May 2023
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