Statistics – Applications
Scientific paper
Jan 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..654...80r&link_type=abstract
SPACE TECHNOLOGY AND APPLICATIONS INT.FORUM-STAIF 2003: Conf.on Thermophysics in Microgravity; Commercial/Civil Next Generation
Statistics
Applications
Heat Engines, Heat Pumps, Heat Pipes, Spaceborne And Space Research Instruments, Apparatus, And Components
Scientific paper
With the continuous increase of interest for satellite and structures thermal control using capillary driven two-phase loops, this paper presents an experimental investigation of a small-scale capillary pumped loop (CPL). Tests were performed with an internally grooved extrusion with a hollow polyethylene porous structure as the capillary evaporator, using acetone and anhydrous ammonia as working fluids. For a range of power applied to the evaporator, the system presented reliable start-ups and continuous operation for several hours for each working fluid, without a tendency of temperature overshooting. Comparing the operation of the CPL using two different working fluids, the system showed faster startups, smaller levels of superheating and consequently better heat transport capability when anhydrous ammonia was used. The capillary evaporator temperature distribution was also experimentally investigated, which showed that the proposed configuration did not present a tendency of localized superheating or dryout, which may represent a reliable thermal control system to be used when limited area is available. Preliminary tests using a capillary evaporator with sintered nickel wick showed greater difference on the temperature distribution for low heat load, which is mainly due to the metallic wick thermal conductivity characteristics.
Bazzo Edson
Riehl Roger R.
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