Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN Imprimir: 0276-1459
ISSN On-line: 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

RESUMO

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%.


Articles with similar content:

SATURATION NUCLEATE BOILING OF PF-5060 ON INCLINED DIMPLED SURFACES
First Thermal and Fluids Engineering Summer Conference, Vol.15, 2015, issue
Arthur Suszko, Mohamed S. El-Genk, Krishna Kota
Saturation Boiling of HFE-7100 Dielectric Liquid on Copper Surfaces with Corner Pins at Different Inclinations
Journal of Enhanced Heat Transfer, Vol.16, 2009, issue 2
Jack L. Parker, Mohamed S. El-Genk
Enhanced Boiling Heat Transfer from Silicon Chips with Micro-Pin Fins Immersed in FC-72
Journal of Enhanced Heat Transfer, Vol.10, 2003, issue 2
Hiroshi Takamatsu, Hiroshi Honda, Jin Jia Wei
THE ENHANCEMENT OF NUCLEATE BOILING BY FOAM
International Heat Transfer Conference 8, Vol.6, 1986, issue
Amnuay Udomboresuwan , Russell B. Mesler
CHARACTERISTICS OF ADHESION OF DIESEL FUEL ON IMPINGEMENT DISK WALL. PART 1: EFFECT OF IMPINGEMENT AREA AND INCLINATION ANGLE OF DISK
Atomization and Sprays, Vol.23, 2013, issue 8
Masataka Arai, Yoshio Zama, Tomohiko Furuhata, Mohd Zaid Akop