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  • 1
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    Dynamic Rheological Studies of Coagulation and Fibrinolysis (1979)
    American Institute of Physics
    Details
    Publication Date: 1979-12-01
    Print ISSN: 0148-6055
    Electronic ISSN: 1520-8516
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    Long term performance of the advanced thermal control flight experiment (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The Advanced Thermal Control Flight Experiment (ATFE) is providing the first zero-g flight data for the performance of a thermal diode heat pipe and an electrical Feedback Controlled Heat Pipe (FCHP). The temperature stability derived from the melting and freezing of octadecane is also being evaluated in this experiment. Flight data for the different operational modes are compared to ground test data, and the performance of the individual components is analyzed. Also, the ATFE's long term behavior from launch through September 30, 1975, is evaluated. The temperature control capability of a thermal diode, phase change material, and FCHP was demonstrated over more than 500 days of flight operation and each of these components should be considered in future applications. Both the diode and FCHP transport more than 20 W in the normal and passive modes during maximum conditions. Up to 30 W has been carried by the FCHP when the auxiliary heater is applied. The "OFF-conductance" of the diode has improved substantially in flight. A 1.4 W decrease in backflow has been realized by more complete blockage. The variable conductance behavior of the FCHP is essentially unchanged with time and relative to ground tests. Degradation of the radiator and reservoir surfaces have resulted in a partial loss of control by the FCHP during normal mode operation; however, manual control at an elevated set point has demonstrated the FCHP's ability to provide regulated temperature control to within + or - 2 C. The same pipe when operated as a passive VCHP controlled at 35 + or - 10 C with the same test conditions.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: ESA Heat Pipes; p 629-643
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Heat pipes for spacecraft temperature control: An assessment of the state-of-the-art (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Spacecraft applications that require the efficient cooling of high-powered components, the precise temperature control of sensitive electronic and optical components, and the protection of cooled components from temporary, adverse environmental conditions are increasing. Heat pipes using gas, vapor, liquid, or voltage control to provide variable conductance or diode thermal behavior have been and are continuing to be developed to meet increasingly difficult requirements. The various control techniques are critically evaluated using characteristic features and properties, including heat transport capability, volume and mass requirements, complexity and ease of fabrication, reliability, and control characteristics. As a result, advantages and disadvantages of specific approaches are derived and discussed. Using four development levels, the state-of-the-art of the various heat pipe temperature control techniques is assessed.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: ESA Heat Pipes; p 167-181
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    ATS-6 - Flight performance of the Advanced Thermal Control Flight Experiment (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The Advanced Thermal Control Flight Experiment on ATS-6 was designed to demonstrate the thermal control capability of a thermal diode (one-way) heat pipe, a phase-change material for thermal storage, and a feedback-controlled heat pipe. Flight data for the different operational modes are compared to ground test data, and the performance of the components is evaluated on an individual basis and as an integrated temperature-control system.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: IEEE Transactions on Aerospace and Electronic Systems; AES-11; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Variable conductance heat pipes from the laboratory to space (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Heat pipes were developed which can be used as (1) a variable conductance link between a heat source and sink which provides temperature stability; (2) a feedback control mechanism that acts to directly maintain the source at a constant temperature; (3) or as a thermal diode that allows heat to be transferred in one direction only. To establish flight level confidence in these basic control techniques, the Ames Heat Pipe Experiment (AHPE) was launched in August 1972 and the Advanced Thermal Control Flight Experiment (ATFE) is scheduled for launch in May 1973. The major efforts of the technology development, initial flight results of the AHPE, and ground test data of the ATFE are discussed.
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: NASA-TM-X-62290
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Heat pipes for spacecraft temperature control: An assessment of the state-of-the-art (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Various heat pipe temperature control techniques are critically evaluated using characteristic features and properties, including heat transport capability, volume and mass requirements, complexity and ease of fabrication, reliability, and control characteristics. Advantages and disadvantages of specific approaches are derived and discussed. Using four development levels, the state of-the-art of the various heat pipe temperature control techniques is assessed. The need for further research and development is discussed and suggested future efforts are projected.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-X-73096
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    "Thermal-diode" heat pipe (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Device transfers heat in one direction and blocks heat transfer in opposite direction.
    Keywords: MECHANICS
    Type: ARC-10997 , NASA Tech Briefs (ISSN 0145-319X); 1; 2; P. 237
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Thermal testing techniques at high solar intensities. (1967)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Thermal testing techniques for solar probe spacecraft using analytical and experimental models
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Entrainment, Drizzle, and Cloud Albedo (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Increased aerosol and hence droplet concentrations in polluted clouds are expected to inhibit precipitation and thereby increase cloud water, leading to more reflective clouds that partially offset global warming. Yet polluted clouds are not generally observed to hold more water. Much of the uncertainty regarding the indirect aerosol effect stems from inadequate understanding of such changes in cloud water. Detailed simulations show that the relative humidity of air overlying stratocumulus is a leading factor determining whether cloud water increases or decreases when precipitation is suppressed. When the overlying air is dry, cloud water can decrease as droplet concentrations increase.
    Keywords: Meteorology and Climatology
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Parametric performance of extruded axial grooved heat pipes from 100 to 300 K (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Extensive performance data derived from tests with an aluminum axial grooved extruded heat pipe is presented for oxygen, methane, ethane, and ammonia as working fluids. The effects of operating temperature, fluid inventory, heat flux, and elevation on the transport capability and the evaporator and condenser film coefficients are measured and compared to theory. The data correlation indicates that, in addition to the viscous pressure drop of the fluid, a vapor induced liquid pressure drop must be taken into account at temperatures near or below the normal boiling point of the fluid. Methane, ethane, and ammonia are all suitable working fluids for this groove geometry; however, oxygen, because of its low static height, is at best marginal in the 100-120 K range.
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: AIAA PAPER 74-724 , Thermophysics and Heat Transfer Conference; Jul 15, 1974 - Jul 17, 1974; Boston, MA
    Format: text
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    NASA TECHNICAL REPORTS
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