Research Papers: Evaporation, Boiling, and Condensation

Saturation Nucleate Boiling and Correlations for PF-5060 Dielectric Liquid on Inclined Rough Copper Surfaces

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

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

Arthur Suszko

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

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received August 29, 2013; final manuscript received March 22, 2014; published online April 23, 2014. Assoc. Editor: Sujoy Kumar Saha.

J. Heat Transfer 136(8), 081503 (Apr 23, 2014) (10 pages) Paper No: HT-13-1452; doi: 10.1115/1.4027365 History: Received August 29, 2013; Revised March 22, 2014

Saturation pool boiling experiments of degassed PF-5060 dielectric liquid investigated nucleate boiling on 13 Cu surfaces with average roughness, Ra, of 0.039 (smooth polished) to 1.79 μm at six inclination angles, θ, from 0 deg (upward facing) to 180 deg (downward facing). Values of the nucleate boiling heat transfer coefficient, hNB, in the upward facing orientation increase with increasing surface roughness and are correlated in terms of the applied heat flux, q: hNB = A qB. The exponent “B” decreases from 0.81 to 0.69 as Ra increases from 0.039 to 1.79 μm, while the coefficient “A” increases with Ra to the power 0.24. The values of the maximum heat transfer coefficient, hMNB, which occurs near the end of the fully developed nucleate boiling region, increase with increasing Ra and decreasing inclination angle. In the upward facing orientation, hNB increases by ∼58% with increasing Ra from 0.134 to 1.79 μm, while hMNB increases by more than 150% compared with that on smooth-polished Cu. Values of hMNB in the downward facing orientation are ∼40% of those in the upward facing orientation.

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Fig. 1

Surface profiles for rough Cu surfaces

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Fig. 2

Surface average roughness versus grit count

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Fig. 3

SEM images of rough and smooth Cu surfaces

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Fig. 4

Pool boiling experimental facility [15,26,32]

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Fig. 5

Reproducibility of pool boiling curves of rough Cu

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Fig. 6

Hysteresis in saturation boiling on a rough Cu surface

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Fig. 7

Saturation pool boiling on inclined rough Cu surfaces

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Fig. 8

Saturation boiling on rough Cu at different inclinations

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Fig. 9

Effect of surface roughness on nucleate boiling

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Fig. 10

Coefficients of hNB correlation on rough Cu surfaces

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Fig. 11

Correlation and data of hNB for upward orientation

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Fig. 12

Comparison with other nucleate boiling correlations

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Fig. 13

Effects of inclination and surface roughness on hMNB

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Fig. 14

Dependence of hMNB on average surface roughness

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Fig. 15

Comparison of hMNB predictions with measurements

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Fig. 16

A performance map for hMNB on rough Cu surfaces




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