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Effects of Surface Roughness and Inclination Angle on Nucleate Boiling of PF-5060 Dielectric Liquid on Copper

[+] Author Affiliations
Mohamed S. El-Genk, Arthur Suszko, Amir F. Ali

University of New Mexico, Albuquerque, NM

Paper No. IMECE2013-65512, pp. V08CT09A034; 8 pages
doi:10.1115/IMECE2013-65512
From:
  • ASME 2013 International Mechanical Engineering Congress and Exposition
  • Volume 8C: Heat Transfer and Thermal Engineering
  • San Diego, California, USA, November 15–21, 2013
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5636-9
  • Copyright © 2013 by ASME

abstract

Saturation pool boiling experiments of PF-5060 dielectric liquid are performed using eleven different Cu surfaces with average roughness, Ra = 0.21 to 1.79 μm, at inclination angle, θ, from 0° (upward facing) to 180° (downward facing). Nucleate boiling heat transfer coefficient, hNB, increases with increasing surface roughness and with decreasing inclination angle. The measured enhancements in hNB with increased surface roughness are in excess of 36%. In the upward facing orientation, the experimental values of hNB are correlated in terms of the surface heat flux in the experiments, q, as: hNB = A qB. The coefficient “A” increases from ∼0.14 to 0.23, while the exponent “B” decreases from 0.76 to 0.69 as Ra increases from 0.21 to 1.79 μm.

Copyright © 2013 by ASME

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