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Flow Visualization within a Capillary Evaporator
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English
Abstract
A Capillary Pumped Loop (CPL) is an advanced two-phase heat transport device which utilizes capillary forces developed within porous wicks to move a working fluid. The advantage this system has over conventional thermal management systems is its ability to transfer large heat loads over long distances at a controlled temperature. Extensive ground testing and two flight experiments have been performed over the past decade which have demonstrated the potential of the CPL as a reliable and versatile thermal control system for space applications. While the performance of CPL's as “black boxes” is now well understood, the internal thermo-fluid dynamics in a CPL are poorly known due to the difficulty of taking internal measurements. In order to visualize transient thermohydraulic processes occurring inside an evaporator, a see-through capillary evaporator was built and tested at NASA's Goddard Space Flight Center. Visual results from the testing have clarified several phenomena that could only be resolved by examining the inside of the evaporator during operation.
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Citation
Ku, J., Swanson, T., Herold, K., and Kolos, K., "Flow Visualization within a Capillary Evaporator," SAE Technical Paper 932236, 1993, https://doi.org/10.4271/932236.Also In
References
- Kroliczek E. J. Ku J. Ollendorf S. “Design, Development and Testing of Capillary Pumped Loop Heat Pipe” AIAA Paper No. 84-1720 1984
- Fredley J. Pelszynske A. “Accommodation of the EOS AM instrument Set Using Capillary Pumped Heat Transport Technology” SAE Paper No. 921404 1992
- Roukis S. Kroliczek E.J. Hall G. “COMET Service Module Thermal Control Design Using Capillary Pumped Loop” SAE Paper No. 921367 1992
- Ku J. Kroliczek E. J. McCabe M. Benner S. M. “A High Power Spacecraft Thermal Management System” AIAA Paper No. 88-2702 1988
- Ku J. “Overview of Capillary Pumped Loop Technology” Heat Pipes and Capillary Pumped Loops 1993 National Heat Transfer Conference August 8-11, 1993 Atlanta, Georgia
- Ku J. Kroliczek E. J. Taylor W. J. McIntosh R. “Functional and Performance Tests of Two Capillary Pumped Loop Engineering Models” AIAA Paper No. 86-1248 1986
- Ku J. “CPL Development Status and Current Issues” CPL Workshop III NASA Goddard Space Flight Center Annapolis, Maryland May 19-21, 1992
- Ottenstein L. Ku J. Butler D. “Testing of Components for the Capillary Pumped Loop Flight Experiment” SAE 23rd International Conference on Environmental Systems July 12-15, 1993 Colorado Spring, Colorado