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  • 1
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    Advanced radiator concepts utilizing honeycomb panel heat pipes (stainless steel) (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The feasibility of fabricating and processing moderate temperature range heat pipes in a low mass honeycomb sandwich panel configuration for highly efficient radiator fins for the NASA space station was investigated. A variety of honeycomb panel facesheet and core-ribbon wick concepts were evaluated within constraints dictated by existing manufacturing technology and equipment. Concepts evaluated include: type of material, material and panel thicknesses, wick type and manufacturability, liquid and vapor communication among honeycomb cells, and liquid flow return from condenser to evaporator facesheet areas. In addition, the overall performance of the honeycomb panel heat pipe was evaluated analytically.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-171977 , NAS 1.26:171977 , W-30746
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Honeycomb panel heat pipe development for space radiators (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An assessment of the honeycomb panel heat pipe concept as a moderate temperature range, low-mass, highly efficient radiator fin for the NASA Space Station is presented, based on test results for a thin-wall (0.46 mm) all-welded stainless steel sample with core depth of 63.5 mm and a hexagonal-cell size of 127.7 mm. The 0.61 x 3.05 m test segment, operating with methanol as a working fluid, exhibited a maximum heat transfer rate of 600 W at 50 C and was isothermal to within + or - 2 C almost entirely throughout the surface. Tilt testing, which comprised relocation of the heater along one edge of the panel, resulted in maximum power levels of 70 and 50 W at panel elevations of 12.7 and 25.4 mm, respectively. As-designed panel performance is predicted to be from 500 to 1000 W over the range of operating temperatures; better performance is predicted for an open-channel design.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 85-0978
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Flat-plate heat pipe (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Heat pipe has its working fluid sealed between two flat panels rather than in conventional cylindrical housing. Metal wick is installed between planes to provide continuous fluid path in cooperation with capillary groves on inside surfaces of plates. Heat pipe is easily coupled to flat surfaces such as integrated circuit substrates, mirrors, and electronic cold plates and is more effective than conventional heat pipes when removing heat in these applications.
    Keywords: PHYSICAL SCIENCES
    Type: GSC-11998 , NASA Tech Briefs (ISSN 0145-319X); 3; 1; P. 43
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    User's manual for the TRW gaspipe 2 program: A vapor-gas front analysis program for heat pipes containing non-condensible gas (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A digital computer program for design and analysis of heat pipes which contain non-condensible gases, either for temperature control or to aid in start-up from the frozen state, is presented. Some of the calculations which are possible with the program are: (1) wall temperature profile along a gas-loaded heat pipe, (2) amount of gas loading necessary to obtain desired evaporator temperature at a desired heat load, (3) heat load versus evaporator temperature for a fixed amount of gas in the pipe, and (4) heat and mass transfer along the pipe, including the vapor-gas front region.
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: NASA-CR-114672 , TRW-13111-6054-RO-00
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Vapor-modulated heat pipe report. Flight data analysis and further development of variable-conductance heat pipes (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The design and testing of a heat pipe for spacecraft application is presented. The application in mind calls for heat loads up to 20 watts, a set-point temperature of 294K, and a sink that varies from -220K to nearly as high as the set-point. The overall heat pipe length is 137 cm. Two basically different mechanisms of achieving variable conductance in the pipe by vapor-flow throttling were studied. In one, the thermal resistance between the heat source and sink is due to a saturation-temperature drop corresponding to the vapor-pressure drop developed across the valve. In the other, the pressure difference across the valve induces capillary groove and wick dry out in an evaporation region, and thus results in an increased thermal resistance. This mechanism was selected for fabrication and testing. The pipe is a stainless-steel/methanol two-heat-pipe system. Results are presented and discussed. Engineering drawings and specifications of the pipe are shown.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-146143 , TRW-26263-6015-RU-00
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Steady-state and transient performance of hot reservoir gas-controlled heat pipes (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Liquid or vapor phase working fluids penetration effects on steady state and transient performance of hot reservoir gas controlled heat pipes
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: SPACE SYSTEMS AND THERMAL TECHNOLOGY FOR THE 70''S, AMERICAN SOCIETY OF MECHANICAL ENGINEERS, SPACE TECHNOLOGY AND HEAT TRANSFER CONFERENCE; Jun 21, 1970 - Jun 24, 1970; LOS ANGELES, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Theory and design of variable conductance heat pipes: Steady state and transient performance (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Heat pipe technology pertinent to the design and application of self-controlled, variable conductance heat pipes for spacecraft thermal control is discussed. Investigations were conducted to: (1) provide additional confidence in existing design tools, (2) to generate new design tools, and (3) to develop superior variable conductance heat pipe designs. A computer program for designing and predicting the performance of the heat pipe systems was developed.
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: NASA-CR-114530 , REPT-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Flat-plate heat pipe (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Flat plate (vapor chamber) heat pipes were made by enclosing metal wicking between two capillary grooved flat panels. These heat pipes provide a unique configuration and have good capacity and conductance capabilities in zero gravity. When these flat plate vapor chamber heat pipes are heated or cooled, the surfaces are essentially isothermal, varying only 3 to 5 C over the panel surface.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Heat Pipe Materials Compatibility (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An experimental program to evaluate noncondensable gas generation in ammonia heat pipes was completed. A total of 37 heat pipes made of aluminum, stainless steel and combinations of these materials were processed by various techniques, operated at different temperatures and tested at low temperature to quantitatively determine gas generation rates. In order of increasing stability are aluminum/stainless combination, all aluminum and all stainless heat pipes. One interesting result is the identification of intentionally introduced water in the ammonia during a reflux step as a means of surface passivation to reduce gas generation in stainless-steel/aluminum heat pipes.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-135069 , TRW-26148-6004-RU-00 , GRC-E-DAA-TN10587
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    User's manual for the TRW gaspipe program. A vapor-gas front analysis program for heat pipes containing noncondensible gas (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Digital computer program manual for design, analysis, and performance prediction of heat pipes with noncondensible gases including input/output routines and Runge-Kutta models
    Keywords: FLUID MECHANICS
    Type: NASA-CR-114306 , TRW-13111-6022-R0-00
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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