Statistics – Applications
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..608..181e&link_type=abstract
SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM- STAIF 2002. Conference on Thermophyiscs in Microgravity; Conference on In
Statistics
Applications
1
Spaceborne And Space Research Instruments, Apparatus, And Components, Heat Flow In Multiphase Systems
Scientific paper
The effects of simulated reduced gravity on nucleate boiling and Critical Heat Flux (CHF) of the hydrofluoroether. HFE-7100 dielectric liquid from a 1.0-cm2 smooth copper surface are investigated experimentally. Reduced gravity is simulated by varying the inclination angle of the surface, θ, from 0° (upward-facing, 1-g) to 180° (downward facing, zero-g) in 10°-30° increments. Results show that nucleate boiling heat fluxes at surface superheats, ΔTsat>13 K are highest at 0° and decrease with increased θ to 180°. At lower superheats, however, the nucleate boiling heat flux data are inconclusive, with the lowest and highest values occurring at 120° and 180°, respectively. The developed correlations for saturation nucleate boiling, as a function of θ, is within +/- 10% of the data. Correlations for the normalized CHF to that at 0° (or CHFR), and of the surface superheat at CHF (<=31.7 K) are also developed as functions of θ. The CHFR decreases slowly as θ increases from 0° to 120°, then faster for θ>120°, consistent with earlier work for dielectric and non-dielectric liquids. The surface superheat at CHF also decreases as θ increases reaching its lowest value at 180°. Photographs of saturation nucleate boiling at θ=0°, 30°, 120° and 180°, support the nucleate boiling heat flux measurements. This work demonstrated that dissipation heat fluxes of 24.45 and 4.30 W/cm2 could be removed from a high performance computer chip by saturation nucleate boiling of HFE-7100 at 0° (or 1g) and 180° (or zero-g), at surface superheats of 31.7 and 19.9 K, respectively. .
Bostanci Huseyin
El-Genk Mohamed S.
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