Analysis of Supercritical Startup of Cryogenic Heat Pipes With Parasitic Heat Loads

A mathematical model to predict the transient temperature profile of a cryogenic heat pipe during startup is presented. The improved model accounts for a known time-variable temperature boundary condition at the condenser region, while the boundary condition in the remaining length of the heat pipe...

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Veröffentlicht in:Journal of thermophysics and heat transfer 2005-10, Vol.19 (4), p.497-508
Hauptverfasser: Couto, Paulo, Ochterbeck, Jay M, Mantelli, Marcia B. H
Format: Artikel
Sprache:eng
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Zusammenfassung:A mathematical model to predict the transient temperature profile of a cryogenic heat pipe during startup is presented. The improved model accounts for a known time-variable temperature boundary condition at the condenser region, while the boundary condition in the remaining length of the heat pipe is a radiative parasitic heat flux. The vapor pressure is modeled to determine the mass distribution of the saturated liquid inside the heat pipe. An axially grooved aluminum/oxygen cryogenic heat pipe is considered. Theoretical results for the axial temperature profile of the heat pipe for the startup period are compared to experimental m-g flight data to validate the new model. Following the validation, the effects of some operational parameters over the axial temperature profile for the startup period are investigated to determine under what conditions the cryogenic heat pipe will start properly.
ISSN:0887-8722
1533-6808
DOI:10.2514/1.10849