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Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN Druckformat: 0276-1459
ISSN Online: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v26.i2.20
pages 139-170

SATURATION AND SUBCOOLED CHF CORRELATIONS FOR PF-5060 DIELECTRIC LIQUID ON INCLINED ROUGH COPPER SURFACES

Mohamed S. El-Genk
Institute for Space and Nuclear Power Studies; Mechanical Engineering Department; Nuclear Engineering Department, Chemical & Biological Engineering Dept., University of New Mexico, Albuquerque, New Mexico, 87131 USA
Arthur Suszko
Institute for Space and Nuclear Power Studies, Mechanical Engineering Dept., University of New Mexico, Albuquerque, NM, USA

ABSTRAKT

Pool-boiling experiments investigated the critical heat flux (CHF) for degassed PF-5060 dielectric liquid on inclined and uniformly heated 10×10 mm rough copper (Cu) surfaces. The experiments tested 13 surfaces with average roughness, Ra = 0.039 (smooth-polished), 0.134, 0.21, 0.28, 0.33, 0.58, 0.71, 0.80, 0.925, 1.00, 1.21, 1.44, and 1.79 μm, at inclination angles, θ = 0° (upward facing); 60°, 90° (vertical); and 120°, 150°, 160°, 170°, and 180° (downward facing). In addition, liquid subcooling in the experiments, ΔTsub, varied from 0 K (saturation) to 30 K. The CHF increased with increasing both surface roughness and liquid subcooling, but decreased with increasing inclination angle. For all inclinations, CHFsat on the roughest surface is ~35% higher than on the smoothpolished Cu. Moreover, regardless of Ra, CHFsat values in the downward facing orientation (180°) are typically ~31% of those in the upward facing orientation (0°). CHF in the upward facing orientation increases linearly with increasing liquid subcooling at a rate of ~2.2%/K, independent of Ra. This rate increases with increasing the inclination angle to as much as 4%/K in the downward facing orientation. The developed CHF correlation based on the present database accounts for surface roughness and inclination angle, and the liquid's subcooling and physical properties and agrees with the experimental data to within ±10%.


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