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  • 1
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    Vapor resistant arteries (1989)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: A vapor block resistant liquid artery structure for heat pipes. A solid tube artery with openings is encased in the sintered material of a heat pipe wick. The openings are limited to that side of the artery which is most remote from the heat source. The liquid in the artery can thus exit the artery through the openings and wet the sintered sheath, but vapor generated at the heat source is unlikely to move around the solid wall of the artery and reverse its direction in order to penetrate the artery through the openings. An alternate embodiment uses finer pore size wick material to resist vapor entry.
    Keywords: Fluid Mechanics and Thermodynamics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Vapor resistant arteries (1989)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: A vapor block resistant liquid artery structure for heat pipes. A solid tube artery with openings is encased in the sintered material of a heat pipe wick. The openings are limited to that side of the artery which is most remote from the heat source. The liquid in the artery can thus exit the artery through the openings and wet the sintered sheath, but vapor generated at the heat source is unlikely to move around the solid wall of the artery and reverse its direction in order to penetrate the artery through the openings. An alternate embodiment uses finer pore size wick material to resist vapor entry.
    Keywords: Fluid Mechanics and Thermodynamics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Vapor-Resistant Heat-Pipe Artery (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Vapor lock in heat pipe delayed or prevented. Modifications of wick prevent flow of vapor into, or formation of vapor in, liquid-return artery. Small pores of fine-grained sintered wick help to prevent formation of large bubbles. Slotted tube offers few nucleation sites for bubbles. Improves return of liquid in heat pipe.
    Keywords: MECHANICS
    Type: MSC-21492 , NASA Tech Briefs (ISSN 0145-319X); 15; 6; P. 61
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Moving-Gradient Furnace With Constant-Temperature Cold Zone (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Outer heat pipe helps in controlling temperature of cold zone of furnace. Part of heat-pipe furnace that includes cold zone surrounded by another heat pipe equipped with heater at one end and water cooling coil at other end. Temperature of heat pipe maintained at desired constant value by controlling water cooling. Serves as constant-temperature heat source or heat sink, as needed, for gradient of temperature as gradient region moved along furnace. Proposed moving-gradient heat-pipe furnace used in terrestrial or spaceborne experiments on directional solidification in growth of crystals.
    Keywords: PHYSICAL SCIENCES
    Type: MFS-26201 , NASA Tech Briefs (ISSN 0145-319X); 17; 8; P. 56
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    External artery heat pipe (1989)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: An improved heat pipe with an external artery. The longitudinal slot in the heat pipe wall which interconnects the heat pipe vapor space with the external artery is completely filled with sintered wick material and the wall of the external artery is also covered with sintered wick material. This added wick structure assures that the external artery will continue to feed liquid to the heat pipe evaporator even if a vapor bubble forms within and would otherwise block the liquid transport function of the external artery.
    Keywords: Fluid Mechanics and Thermodynamics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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