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Research Papers: Evaporation, Boiling, and Condensation

Saturation Boiling Critical Heat Flux of PF-5060 Dielectric Liquid on Microporous Copper Surfaces

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

Institute for Space and Nuclear Power Studies,
Nuclear Engineering Department,
Mechanical Engineering Department,
Chemical and Biological Engineering Department,
University of New Mexico,
Albuquerque, NM, 87131;
e-mail: mgenk@unm.edu

Amir F. Ali

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

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received July 26, 2013; final manuscript received December 13, 2014; published online January 13, 2015. Assoc. Editor: Cila Herman.

J. Heat Transfer 137(4), 041501 (Apr 01, 2015) (11 pages) Paper No: HT-13-1375; doi: 10.1115/1.4029455 History: Received July 26, 2013; Revised December 13, 2014; Online January 13, 2015

Pool boiling experiments are performed to investigate potential enhancement of critical heat flux (CHF) of PF-5060 dielectric liquid on microporous copper (MPC) surfaces and the effect of surface inclination angle. The morphology and microstructure of the MPC surfaces change with thickness. The experiments tested seven 10 × 10 mm MPC surfaces with thicknesses from 80 to 230 μm at inclination angles of 0 deg (upward facing), 60 deg, 90 deg (vertical), 120 deg, 150 deg, 160 deg, 170 deg, and 180 deg (downward facing). CHF increases as the thickness of the surface increases and/or the inclination angle decreases. The values in the upward facing orientation are 36–59% higher than on smooth Cu. For all surfaces, CHF values in the downward facing orientation are approximately 28% of those in the upward facing orientation. A developed CHF correlation, similar to those of Zuber and Kutateladze, accounts for the effects of inclination angle and thickness of the MPC surfaces. It is in good agreement with experimental data to within ±8%. Still photographs of nucleate boiling on the MPC surfaces at different inclinations help the interpretation of the experimental results.

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References

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Figures

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Fig. 1

SEM images of MPC surfaces of different thicknesses

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Fig. 2

Cross-sectional views of the assembled test section

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Fig. 3

A sketch of experimental facility layout [1,7,12,18,19,28]

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Fig. 4

Pool boiling curves of PF-5060 dielectric liquid on conditioned MPC surfaces in the upward facing orientation (0 deg)

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Fig. 5

Saturation boiling hysteresis of PF-5060 liquid on MPC surfaces at 0 deg and marking of different nucleate boiling regions

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Fig. 6

Effect of inclination angle on saturation nucleate boiling of PF-5060 dielectric liquid on MPC surfaces

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Fig. 7

Effect of inclination angle on saturation boiling CHF of PF-5060 dielectric liquid on MPC and smooth Cu surfaces

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Fig. 8

Saturation boiling CHF data and coefficient for PF-5060 liquid on MPC surfaces at different inclinations

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Fig. 9

Effect of inclination angle on surface superheat at CHF for saturation boiling of PF-5060 on MPC

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Fig. 10

Comparison of CHF and corresponding surface superheats on MPC to reported values on other surfaces

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Fig. 11

Comparison of CHF correlation and experimental values for saturation boiling of PF-5060 liquid on MPC surfaces

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Fig. 12

Enhancements in saturation boiling CHF for PF-5060 liquid on MPC surfaces

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Fig. 13

Photographs of saturation boiling of PF-5060 liquid on smooth Cu and MPC surfaces in upward facing orientation (θ = 0 deg)

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Fig. 14

Photographs of saturation boiling of PF-5060 liquid on upward inclined and vertical MPC surfaces

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Fig. 15

Photographs of saturation boiling of PF-5060 liquid on an MPC surface in the downward facing orientation (θ = 180 deg)

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Fig. 16

Illustrations of vapor generation, accumulation, and release from test section in the downward facing orientation

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