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Heat Pipe Science and Technology, An International Journal

ISSN Druckformat: 2151-7975
ISSN Online: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.2016016774
pages 155-165

EFFECTIVENESS OF COMBINED SUBCOOLER-CAPILLARY BLOCKER DEVICE IN LHP FOR SPACE APPLICATIONS

Anatoly P. Lukisha
Department of Mine Energy Complexes, Polyakov Institute of Geotechnical Mechanics, National Academy Science of Ukraine, 2a Simferopol'skaya Str., Dnipropetrovsk, 49005, Ukraine
Donatas Mishkinis
IberEspacio, Calle Magallanes 3, 4th floor, 28015, Madrid, Spain

ABSTRAKT

The critical condition of reliable and stable operation of a loop heat pipe is complete condensation of a working fluid in a condenser with subsequent subcooling of the liquid before entering in a compensation chamber. Usually, the final part of the condenser operates as a subcooler. The design of the loop heat pipe with separated subcooler acting also as a vapor/gas bubbles stopper (capillary blocker) is proposed. The subcooler-capillary blocker (SCB) is installed after the condenser. Its purpose is to capture noncondensed vapor bubbles, subcool the working fluid below the saturation temperature, and to eliminate a countercurrent in the loop heat pipe. A model of an SCB was developed and thermal-hydraulic calculations of the efficiency of the proposed SCB in comparison with a smooth-wall subcooler (geometric efficiency coefficient) were performed. Influence of the mass flow rate (Reynolds number), diameter of the channel, and of the porosity of a capillary structure on the SCB efficiency has been investigated. Emission in a vacuum was used as the boundary condition (modeling of space environment). It was proposed to use aluminum or silver fibers as an SCB capillary structure material to facilitate heat exchange (subcooling) and to minimize the pressure drop in SCB. The LHPs working fluid ammonia, typical of space applications, was selected for analysis.