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Nanoparticulate gellants for metallized gelled liquid hydrogen with aluminumGelled liquid hydrogen was experimentally formulated using sol-gel technology. As a follow-on to work with cryogenic simulants, hydrogen was gelled with an alkoxide material: BTMSE. Initial results demonstrated that gellants with a specific surface area of 1000 m(exp 2)/g could be repeatably fabricated. Gelled hexane and metallized gelled hexane (with 13.8-wt% Al) were produced. Propellant settling testing was conducted for acceleration levels of 2 to 10 times normal gravity and a minimum gellant percentage was determined for stable gelled hexane and metalized gelled hexane. A cryogenic capillary rheometer was also designed, constructed, and used to determine the viscosity of gelled hydrogen. Small volumes of liquid hydrogen were gelled with a 7- to 8-wt% gellant level. The gelled H2 viscosity was 1.5 to 3.7 times that of liquid hydrogen: 0.048 to 0.116 mPa-s versus 0.03 mPa-s for liquid H2 (at 16 K and approximately 1 atm pressure).
Document ID
19960048665
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Palaszewski, Bryan (NASA Lewis Research Center Cleveland,OH United States)
Starkovich, John (TRW Defense and Space Systems Group Redondo Beach, CA United States)
Adams, Scott (TRW Defense and Space Systems Group Redondo Beach, CA United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1996
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
E-10354
NASA-TM-107280
NAS 1.15:107280
AIAA Paper 96-3234
Report Number: E-10354
Report Number: NASA-TM-107280
Report Number: NAS 1.15:107280
Report Number: AIAA Paper 96-3234
Meeting Information
Meeting: Joint Propulsion Conference and Exhibit
Location: Lake Buena Vista, FL
Country: United States
Start Date: July 1, 1996
End Date: July 3, 1996
Sponsors: American Society for Electrical Engineers, Society of Automotive Engineers, Inc., American Society of Mechanical Engineers, American Inst. of Aeronautics and Astronautics
Accession Number
96N33886
Funding Number(s)
PROJECT: RTOP 252-50-01
CONTRACT_GRANT: NAS3-26714
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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