This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Deleterious Effects of Non-Condensible Gas During Capillary Pumped Loop Startup
Annotation ability available
Sector:
Language:
English
Abstract
Deprimes occuring in capillary pumped loops (CPLs) with small-diameter evaporator pumps (≤ 16 mm) were examined analytically and experimentally. The proposed deprime mechanism advanced by this paper is nucleation of a pressurized vapor bubble that can blow through the evaporator wick and lead to immediate CPL deprime or unstable operation with a likelihood of deprime at a later time. This failure mechanism is exacerbated by the presence of a non-condensible gas species like hydrogen in the ammonia working fluid. Use of a robust startup evaporator to empty the normal vapor spaces of the remaining CPL evaporators prior to startup is identified as the most effective method for obviating this failure mechanism and ensuring reliable CPL operation.
Topic
Citation
Antoniuk, D. and Pohner, J., "Deleterious Effects of Non-Condensible Gas During Capillary Pumped Loop Startup," SAE Technical Paper 941408, 1994, https://doi.org/10.4271/941408.Also In
References
- Ku, J. Kroliczek, E.J. Taylor, W.J. McIntosh “Functional and Performance Tests of Two Capillary Pumped Loop Engineering Models” 4th Thermophysics and Heat Transfer Conference Boston, Massachusetts June 1986
- Ku, J. Kroliczek, E.J. “Capillary Pumped Loop GAS and Hitchhiker Flight Experiments” 4th Thermophysics and Heat Transfer Conference Boston, Massachusetts June 1986
- Ottenstein, L. Ku, J. Butler, D. “Testing of Flight Components for the Capillary Pumped Loop Flight Experiment” SAE Technical Paper Series 932235 23rd International Conference on Environmental Systems Colorado Springs, Colorado July 1993
- Ku, J. “CPL Development Status and Current Issues” Proceedings of NASA Goddard CPL Workshop III Annapolis, Maryland May 1992
- Wolf, D.W. “Development of Small Diameter Capillary Pumps” Proceedings of NASA Goddard CPL Workshop III Annapolis, Maryland May 1992
- Antoniuk, D. Edwards, D.K. “Depriming of Arterial Heat Pipes: An investigation of CTS Thermal Excursions, Final Report” NASA Lewis Research Center August 20 1980