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The Leidenfrost Phenomenon on Sub-Micron Tapered Pillars

[+] Author Affiliations
Manuel Auliano, Maria Fernandino, Carlos Alberto Dorao

Norwegian University of Science and Technology, Trondheim, Norway

Peng Zhang

Shanghai Jiao Tong University, Shanghai, China

Paper No. ICNMM2017-5557, pp. V001T08A003; 9 pages
doi:10.1115/ICNMM2017-5557
From:
  • ASME 2017 15th International Conference on Nanochannels, Microchannels, and Minichannels
  • ASME 2017 15th International Conference on Nanochannels, Microchannels, and Minichannels
  • Cambridge, Massachusetts, USA, August 27–30, 2017
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-5830-1
  • Copyright © 2017 by ASME

abstract

In this paper, the effect of Si sub-micron tapered pillars on the Leidenfrost point of water droplets at different impact velocities is presented. In the Leidenfrost regime, the low thermal conductivity of the vapor layer deteriorates the heat transfer performance. Micro and nanostructured surfaces can significantly shift the Leidenfrost point towards higher temperatures. To determine this point, the droplet lifetime method was employed. The cooling performance was discussed in terms of the droplet evaporation time and the Weber number. It was observed that Si sub-micron tapered pillars can shift the Leidenfrost point for all the Weber numbers investigated (1–60). The displacement of the Leidenfrost point is enhanced by increasing the droplet impact velocity.

Copyright © 2017 by ASME

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