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Boiling/Evaporation Characteristics of a Droplet on a Nano-Particles-Accumlated Bi-Porous Layer

[+] Author Affiliations
Kazuhisa Yuki, Katsuki Fukushima, Koichi Suzuki

Tokyo University of Science, Yamaguchi, Sanyo-Onoda, Yamaguchi, Japan

Paper No. IPACK2015-48628, pp. V002T06A005; 7 pages
doi:10.1115/IPACK2015-48628
From:
  • ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels
  • Volume 2: Advanced Electronics and Photonics, Packaging Materials and Processing; Advanced Electronics and Photonics: Packaging, Interconnect and Reliability; Fundamentals of Thermal and Fluid Transport in Nano, Micro, and Mini Scales
  • San Francisco, California, USA, July 6–9, 2015
  • Conference Sponsors: Electronic and Photonic Packaging Division
  • ISBN: 978-0-7918-5689-5
  • Copyright © 2015 by ASME

abstract

Boiling/evaporation characteristics of a water droplet on nanoparticles-accumulated bi-porous layers produced by boiling adhesion method are evaluated. In the boiling adhesion method, the bi-porous layer is coated by dropping or spraying nanoparticles-contained solution on a heated metal substrate. By this method, it is possible to produce nanoscale of pore layer formed by accumulating the nanoparticles that have high wettability and microscale of pores formed by boiling bubbles blowing through the layer that work as vapor discharging. Visualization experiments with a high speed camera clarify that the boiling/evaporation performance is improved on the nanoparticles bi-porous layer and also a wetting limit temperature drastically increases. Furthermore, there are many cases where the life time of the droplet shortens even in a low superheated temperature regime. These results suggest that the nanoparticles bi-porous layer would contribute not only to boiling heat transfer enhancement but also to the increase in the critical heat flux.

Copyright © 2015 by ASME

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