A study of the fundamental operation of a Capillary-driven Heat Transfer device in both normal and low gravity Part 2. Effect of evaporator meniscus oscillations

Details A study of the fundamental operation of a Capillary-driven Heat Transfer device in both normal and low gravity Part 2. Effect of evaporator meniscus oscillations A study of the fundamental operation of a Capillary-driven Heat Transfer device in both normal and low gravity Part 2. Effect of evaporator meniscus oscillations

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..458..811a&link_type=abstract

Space technology and applications international forum -1999. AIP Conference Proceedings, Volume 458, pp. 811-817 (1999).

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Heat Engines, Heat Pumps, Heat Pipes, Heat Flow In Multiphase Systems

Scientific paper

Research has been conducted to observe the operation of a capillary-pumped loop (CPL) in both normal and low-gravity environments in order to ascertain the causes of device failure. The failures of capillary pumped loops in low gravity are not understood and the available data for analyzing the failures has been scarce. To observe failure in these devices, an idealized experimental CPL was configured for testing. The experimental test loop was constructed of Pyrex tubing to allow for visualization of system operations. Heat was added to the liquid on the evaporator side of the loop using resistance heaters and removed on the condenser side via forced convection of ambient air. A video camera was used to record the behavior of both the condenser and the evaporator menisci simultaneously. Low-gravity experiments were performed during the Microgravity Science Laboratory mission onboard the Space Shuttle Columbia in July of 1997. From this experiment, wall temperature and vapor pressure fluctuations have been correlated directly to oscillations of the evaporating meniscus. This correlation provides evidence that the oscillatory behavior of the evaporating meniscus contributes to evaporator dry out which is the primary cause of failure in capillary-pumped loops in low gravity.

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