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  • 1
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    Superfluid helium film in zero gravity (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The behaviour of nearly-saturated superfluid helium films several hundred Angstroms thick was investigated under zero gravity conditions in a small cryostat carried on a 0.3 m diameter, 3 m long sounding rocket, using a quartz microbalance technique. The flight provided 30 s of high acceleration, about 5 min. of zero gravity, and 90 s of mg acceleration. The temperature of the experiment ranged from 1.67 to 2.15 K. In contrast to ground test results, thick films uniformly distributed on all surfaces were observed in zero gravity.
    Keywords: ENGINEERING (GENERAL)
    Type: Cryogenics; 20; Feb. 198
    Format: text
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  • 2
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    Characterization of superfluid helium transfer (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The friction factor and steady state flow rate of superfluid helium (He II) are measured, with the driving pressure difference generated by the saturated vapor pressure and a small hydrostatic pressure head. The temperature ranged from 1.5 K to the transition temperature of 2.17 K. Three different lengths and two different internal diameters were used for the stainless steel transfer tubes, and the transfer of liquid helium (He I) was investigated with the same apparatus for comparison. It was found that the friction factor of He II is greater than that of He I for pressure differences greater than 20 mm Hg, and smaller below that magnitude.
    Keywords: ENGINEERING (GENERAL)
    Type: Cryogenics; 21; Apr. 198
    Format: text
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  • 3
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    Sequential-Impulse Generator Uses Fiber-Optics (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Light pulse from a ruby or neodymium-glass laser enters miniature optics of repetitive-detonation apparatus. Traveling along a bundle of optical fibers, light strikes laser-sensitive microdetonator and charge explodes. Apparatus then advances next charge in train into position. Possible applications of sequential-impulse generator are in creating shock waves for aerodynamics research and in generating electrical power by magnetohydrodynamics.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-14939 , NASA Tech Briefs (ISSN 0145-319X); 6; 1; P. 24
    Format: text
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  • 4
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    Compact laser through improved heat conductance (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A 16-joule-pulse laser has been developed in which a boron nitride heat-conductor enclosure is used to remove heat from the elements. Enclosure is smaller and lighter than systems in which cooling fluids are used.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-13147
    Format: application/pdf
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  • 5
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    Laser system to detonate explosive devices (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Detonating system is not affected by electromagnetic interference. System includes laser source, Q-switch, and optical fiber connected to explosive device. Fiber can be branched out and connected to several devices for simultaneous detonation.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-11743
    Format: application/pdf
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  • 6
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    Laser-actuated mechanical device (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Actuator is portable and can be used in high-temperature (over 500 C) environments by incorporating tungsten metal film and quartz window. Actuator can be triggered when it is not directly in laser beam path by utilizing fiber optics. It is advantageous for remotely switching ultra-high voltage systems.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-13105
    Format: application/pdf
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  • 7
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    Measuring Combustion Advance in Solid Propellants (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Set of gauges on solid-propellant rocket motor with electrically insulating case measures advance of combustion front and local erosion rates of propellant and insulation. Data furnished by gauges aid in motor design, failure analysis, and performance prediction. Technique useful in determining propellant uniformity and electrical properties of exhaust plum. Gauges used both in flight and on ground. Foilgauge technique also useful in basic research on pulsed plasmas or combustion of solids.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-16585 , NASA Tech Briefs (ISSN 0145-319X); 10; 5; P. 70
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  • 8
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    Experiments on the properties of superfluid helium in zero gravity (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper describes a research program designed to study the behavior of superfluid liquid helium in low and zero gravity in order to determine the properties which are critically important to its use as a stored cryogen for cooling scientific instruments aboard spacecraft for periods up to several months. The experiment program consists of a series of flights of an experiment package on a free-fall trajectory both on an aircraft and on a rocket. The objectives are to study thickness of thin films of helium as a function of acceleration, heat transfer in thin films, heat transfer across copper-liquid helium interfaces, fluid dynamics of bulk helium in high and low accelerations and under various conditions of rotations, alternate methods of separation of liquid and vapor phases and of efficient venting of the vapor, and undesirable thermomechanical oscillations in the vent pipes. Preliminary results from aircraft tests are discussed.
    Keywords: ENGINEERING (GENERAL)
    Type: International Cryogenic Engineering Conference; May 11, 1976 - May 14, 1976; Grenoble; France
    Format: text
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  • 9
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    The behavior of superfluid helium in zero gravity (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Studies of the behavior of superfluid helium in zero gravity including fluid distribution within the cryostat, thickness of superfluid films, and heat transfer in such films, were conducted in one gravity in the laboratory and in zero-g flights on aircraft and sounding rocket. The studies show that the bulk motions are sufficiently well damped to allow control of their effects on experiments and spacecraft attitude control systems, and that the superfluid films will be able to maintain the high degree of temperature uniformity found in laboratory superfluid helium cryostats. The presentation includes film clips of the motions on the superfluid in zero-g.
    Keywords: ENGINEERING (GENERAL)
    Type: ICEC 7; Seventh International Cryogenic Engineering Conference; Jul 04, 1978 - Jul 07, 1978; London
    Format: text
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