Research Papers: Evaporation, Boiling, and Condensation

Subcooled Boiling of PF-5060 Dielectric Liquid on Microporous Surfaces

[+] Author and Article Information
Mohamed S. El-Genk1

Regents’ Professor and Founding Director of Institute for Space and Nuclear Power Studies, Department of Chemical and Nuclear Engineering; Department of Mechanical Engineering, University of New Mexico, Albuquerque, NM 87131-0001mgenk@unm.edu

Amir F. Ali

Department of Mechanical Engineering and Institute for Space and Nuclear Power Studies, University of New Mexico, Albuquerque, NM 87131-0001


Corresponding author.

J. Heat Transfer 133(8), 081503 (May 03, 2011) (8 pages) doi:10.1115/1.4003748 History: Received August 18, 2010; Revised March 01, 2011; Published May 03, 2011; Online May 03, 2011

Presented are the results of experiments that investigated nucleate boiling of PF-5060 on microporous Cu surface layers at saturation and 10 K, 20 K, and 30 K subcooling. The three microporous layers, electrochemically deposited on 10×10mm2 Cu substrates and investigated herein, are 139μm, 171μm, and 220μm thick. The critical heat flux increases linearly with increased subcooling, ΔTsub, at an average rate of 4.5%/K. For the 171μm thick, Cu microporous surface, saturation boiling CHF of 27.8W/cm2 increases to 63.25W/cm2 at ΔTsub=30K, while the saturation hMNB of 13.5W/cm2K decreases slightly to 12.7W/cm2K at ΔTsub=30K. The values of the surface superheat, ΔTsat, at hMNB and CHF increase from 2.0 K and 2.16 K at saturation to 4.2 and 6.42 K at 30 K subcooling.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 8

Effect of subcooling on hMNB on Cu microporous surfaces

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Figure 9

Effect of subcooling on CHF on Cu microporous surfaces

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Figure 10

Linear dependence of CHF on liquid subcooling

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Figure 1

Electrochemical disposition of nanodendrite layers

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Figure 2

SEM images. The deposited Cu nanodendrites and microporous surface layers

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Figure 3

Cross-sectional views of the assembled test section

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Figure 4

Reproducibility of saturation boiling and hNB Curves of PF-5060 on conditioned 230 μm thick, microporous surface layer

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Figure 5

Comparison of saturation boiling and hNB curves on Cu microporous surface layers of different thicknesses

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Figure 6

Subcooled boiling curves on Cu microporous surfaces

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Figure 7

Subcooled nucleate boiling heat transfer coefficient curves on Cu microporous surfaces



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