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Compound Effect of EHD Force and Micro-Structured Surface Coated With Diamond Particles

[+] Author Affiliations
Ichiro Kano

Yamagata University, Yonezawa, Yamagata, Japan

Paper No. MNHMT2013-22062, pp. V001T04A002; 9 pages
doi:10.1115/MNHMT2013-22062
From:
  • ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer
  • ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer
  • Hong Kong, China, December 11–14, 2013
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-3615-4
  • Copyright © 2013 by ASME

abstract

Boiling heat transfer enhancement via compound effect of the EHD effect and micro-structured surfaces has been experimentally and analytically investigated. A fluorinated dielectric liquid was selected as the working fluid. Pool boiling heat transfer in the saturated liquid was measured at atmospheric pressure. Micro-structured surfaces, which are mainly used for cutting tools, were developed with diamond particles using electro-deposition technique. Four different particle diameters were prepared: 5, 10, 15, and a mixture of 5 and 1.5 μm. The surface containing a mixture of 5 and 1.5 μm provided a 7 K reduction in the incipient superheat and a 26 % increase in the critical heat flux compared with those of a non-coated surface. Upon application of a −5 kV/mm electric filed to the micro structured surface (a mixture of 5 and 1.5 μm particles), a heat flux of 70.2 W/cm2 at a superheat of 21.7K was obtained. The experimental data correlated well with previous theoretical analysis.

Copyright © 2013 by ASME

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