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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Effects of inclination angle and subcooling on nucleate boiling and critical heat flux of HFE-7100

Get access (open in a dialog) DOI: 10.1615/IHTC12.4520
6 pages

Résumé

Experiments are conducted to investigate the effects of inclination, θ, and subcooling, DTsub, on nucleate boiling and Critical Heat Flux (CHF) of HFE-7100 dielectric liquid from 1cm2 smooth, copper surface, simulating a computer chip. For θ = 90°-180°, and ΔTsub = 10, 20, and 30 K, nucleate boiling heat flux decreases as θ increases and generally increases with increased subcooling. At lower inclinations, however, the effect of subcooling on nucleate boiling is very small. For θ ≤ 90° and surface superheat, ΔTsat, > 20 K, saturation nucleate boiling heat flux decreases with increased θ, but at lower superheats it increases with θ, consistent with earlier data for non-dielectric liquids. For θ ≥ 90°, saturation nucleate boiling heat flux decreases with θ, except for ΔTsat, > 13 K, the trend is inconclusive. Correlations of saturation nucleate boiling, as a function of θ, and of CHF, as a function of θ and ΔTsub, agree with data to within ± 10%. The CHF values decrease slowly with θ from 0° to 90°, then faster with θ > 90°. Conversely, CHF increases linearly with ΔTsub, consistent with previous work for dielectric and non-dielectric liquids.