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Passive and Active Stabilization of Liquid Bridges in Low GravityTests are planned in the low gravity environment of the International Space Station (ISS) of new methods for the suppression of the capillary instability of liquid bridges. Our suppression methods are unusual in that they are not limited to liquid bridges having very special properties and may impact a variety of low-gravity and earth-based technologies. There are two main approaches to be investigated: (1) Passive Acoustic Stabilization (PAS); and (2) Active Electrostatic Stabilization (AES). In PAS, the suppression of the mode growth is accomplished by placing the bridge in an acoustic field having the appropriate properties such that the acoustic radiation pressure automatically pulls outward on the thinnest portion of the bridge. In AES, the bridge deformation is sensed optically and counteracted by actively adjusting the electrostatic Maxwell stresses via two ring electrodes concentric with the slightly conducting bridge to offset the growth of the unstable mode. While the present work emphasizes cylindrical bridges, the methods need not be restricted to that case. The methods to be explored are relevant to the suppression of capillary instabilities in floating zone crystal growth, breakup of liquid jets and columns, bubbles, and annular films as well as the management of coolants or propellants in low-gravity.
Document ID
20020029723
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Marston, Philip L. (Washington State Univ. Pullman, WA United States)
Thiessen, David B. (Washington State Univ. Pullman, WA United States)
Marr-Lyon, Mark J. (Washington State Univ. Pullman, WA United States)
Wei, Wei (Washington State Univ. Pullman, WA United States)
Niederhaus, Charles E. (NASA Glenn Research Center Cleveland, OH United States)
Truong, Duc K. (NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2001
Subject Category
Space Processing
Report/Patent Number
AIAA Paper 2001-5093
Meeting Information
Meeting: International Space Station Utilization
Location: Kennedy Space Center, FL
Country: United States
Start Date: October 15, 2001
End Date: October 18, 2001
Sponsors: American Inst. of Aeronautics and Astronautics, NASA Headquarters
Funding Number(s)
CONTRACT_GRANT: NAG3-2378
PROJECT: RTOP 101-43-0A
Distribution Limits
Public
Copyright
Public Use Permitted.

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