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  • 1
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    Pegasus thermal control coatings experiment. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Space environment degradation of thermal control coatings tested by experimental packages on Pegasus I, II and III
    Keywords: SPACE VEHICLES
    Type: AIAA PAPER 66-419
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Mixing of two liquid metals on spar payload due to spin-up and spin-down (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Unexpected results from SPAR experiments, directed at obtaining fine dispersions of metal systems that in a 1-g environment tend to segregate very rapidly, were considered. The physical processes occurring in fluid samples, such as the SPAR samples before solidification, were shown to be insufficient to produce a well mixed liquid by the time solidification was initiated. This would result in solidified samples with the type of segregation noted in the SPAR samples. Experimental evidence and analytical arguments are presented.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-TM-78144
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A technique to correct for sample thickness variations for use with IDAPS X-ray radiograph analysis (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The Image Data Processing System (IDAPS) at the Marshall Space Flight Center is used to analyze radiographs of metal samples to qualitatively and quantitatively map compositional variations across the samples. When the X-ray radiographs are of samples having thickness variations, corrections must be made to accomplish compositional analysis. A correction technique is described for cylindrical samples and is applied to radiographs of SPAR Experiment 74-18. Uncorrected and corrected images are shown.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-78140
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Numerical simulation of forced convection in a two fluid layered system in a floating zone configuration (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Forced convection due to rotational effects has been numerically studied in a stable two-fluid layered system in which the lighter fluid occupies the upper portion of the computational and physical domain. Results are presented for three different fluid height combinations for conditions prevailing in a microgravity environment. It is found that the heavier fluid tends to dominate the flow field, and that equal corotation and counterrotation cases produce nearly identical behavior in the flow and thermal fields.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 89-0071
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Liquid helium management for Gravity Probe-B (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Gravity Probe-B (GP-B) experiment will be degraded if accelerations at a proof mass become larger than one ten billionth g. This makes necessary the management of the configuration and dynamical behavior of the large amount of liquid helium present in the GP-B spacecraft dewar. Three approaches to the solution of this problem are discussed. It is concluded that the most promising technique involves the use of baffles into which the liquid helium can be forced during a relatively high spacecraft rotation period, and in which the liquid helium will be held by capillary forces during the operational period when the rotation rate is much lower. Some likely baffle configurations are suggested.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-82521 , NAS 1.15:82521
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Thermal control coating degradation data from the Pegasus experiment packages. (1967)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Thermal control coating degradation data from aluminum case containing four sensors aboard Pegasus spacecraft
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: AIAA PAPER 67-331 , ; - QUANTUM ELECTRONIC|THERMOPHYSICS SPECIALIST CONFERENCE; Apr 17, 1967 - Apr 20, 1967; NEW ORLEANS, LA
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Thermal control coating degradation data from the Pegasus experiment packages. (1967)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Thermal control coating degradation data from aluminum case containing four sensors aboard Pegasus spacecraft
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: AIAA PAPER 67-331
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Analysis of SPAR 8 single-axis levitation experiment (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The melting and resolidification of SPAR 8 payload melting and resolidification of a glass specimen from the in a containerless condition and the retrieval and examination of the specimen from the. The absence of container contact was assured by use of a single-axis acoustic levitation system. However, the sample contacted a wire cage after being held without container contact by the acoustic field for only approximately 87 seconds. At this time, the sample was still molten and, therefore, flowed aroung the wire and continued to adhere to it. An analysis of why the sample did not remain levitated free of container contact is presented. The experiment is described, and experimental observations are discussed and analyzed.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-TM-82447
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Mechanics of liquid helium in a partially filled rotating dewar in low gravity with application to Gravity Probe-B (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Gravity Probe-B spacecraft is composed largely of a liquid helium dewar containing an experiment package. It is shown that an unsymmetric liquid helium distribution in the dewar can cause unacceptably high forces, gravitational and gravity gradient forces, at the experiment location. It is further shown that for the planned spacecraft configuration and operational parameters, it is very likely that the liquid helium distribution in the dewar will be unsymmetric. The required symmetry can be attained by using higher operational spacecraft rotation rates.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TP-2124 , NAS 1.60:2124
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Flow in a torsionally oscillating filled cylinder (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The flow of a liquid in a completely filled cylinder undergoing torsional oscillations about its longitudinal symmetry axis was studied analytically and experimentally. The objective of the studies was to determine the efficacy of the torsional oscillations in mixing the confined liquid. Flow was found to be confined primarily to toroidal cells at the ends of the cylinder. Cell thickness was about equal to the cylinder radius. The use of baffles at the end walls was shown to enhance the mixing process.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TP-2115 , NAS 1.60:2115
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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