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  • 1
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    The vapor pressure of indium, silver, gallium, copper, tin, and gold between 0.1 and 3.0 bar (1987)
    Springer
    Details
    Publication Date: 1987-07-01
    Print ISSN: 0195-928X
    Electronic ISSN: 1572-9567
    Topics: Physics
    Published by Springer
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    PAPER CURRENT
  • 2
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    A Passive, Vapor Compression Refrigerator for Solar Cooling (1990)
    American Society of Mechanical Engineers
    Details
    Publication Date: 1990-08-01
    Description: A new, completely passive, vapor compression refrigerator is described in this paper. This refrigerator combines elements of the heat pipe and the vapor jet refrigerator and is referred to here as a heat pipe refrigerator. It may be driven with heat from low temperature solar collectors or with industrial waste heat and used to provide cooling. Compression work is provided by gas dynamic processes and liquid pumping may be obtained using gravitational or capillary forces. No power is required for operation. The device has no moving parts and may be externally similar to a heat pipe with three heat transfer zones. The working fluid is chosen to match the desired operating temperature range. Water, at subatmospheric pressure, is an appropriate fluid for operation around room temperature. Theoretical considerations indicate that the thermal coefficient of performance of the heat pipe refrigerator will depend strongly on the magnitude of the temperature differences over which it is designed to operate. Results from a laboratory test confirm the concept and demonstrate cooling down to the freezing point using water vapor at 51°C to drive the device and with heat rejection at 18°C.
    Print ISSN: 0199-6231
    Electronic ISSN: 1528-8986
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by American Society of Mechanical Engineers
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  • 3
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    Interaction of free-stream turbulence with screens and grids: a balance between turbulence scales (1982)
    Cambridge University Press
    Details
    Publication Date: 1982-01-01
    Description: Effects of screens and perforated plates (grids) on free-stream turbulence are studied in several test flow conditions. The level, structure and decay of the turbulence generated by such ‘ manipulators ‘ depend in part on their shear-layer instabilities, and can therefore be niodified by inserting additional devices immediately downstream. The performance of screens and some perforated plates is found to depend on the characteristics of the incoming flow such as velocity, turbulence level and spectra. Combinations of perforated plates and screens are found to be very effective flow manipulators. By optimizing the intermanipulator separation and carefully matching the scales between the manipulator pair, the turbulence decay rate downstream of a grid can be quadrupled. © 1982, Archives Europeennes de Sociology. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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  • 4
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    Flat plate electrohydrodynamic heat pipe experiments (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Performance capabilities of electrohydrodynamic (EHD) flat heat pipes were investigated using Freon 113 and Freon 11 as working fluids. All of the pipes employed straight rod electrodes to form axial liquid flow channels and tranverse grooves for capillary surface wetting. Results show: (1) the EHD pipe will prime under load, (2) voltage controlled conductance can be achieved by varying the active area of the evaporator, and (3) the average evaporator conductances measured in these experiments were consistent with those obtained in other experiments with heat pipes of similar surface geometry using the same or similar working fluids.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-137707
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    An investigation of electrohydrodynamic heat pipes (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The principles of electrohydrodynamic heat pip operation are first discussed. Evaporator conductance experiments are then described. A heat pipe was designed in which grooved and ungrooved evaporator surfaces could be interchanged to evaluate the necessity of capillary grooves. Optimum electrode spacing was also studied. Finally, heat convection in evaporating thin films is considered.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-151977
    Format: application/pdf
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  • 6
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    Measurements of the performance of an electrohydrodynamic heat pipe (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The performance of an electrohydrodynamic heat pipe formed by enclosing three straight axial electrodes with a 1.27 cm O.D. internally threaded stainless steel tube was measured with Freon-11 as working fluid. The condenser and evaporator conductances at low power were comparable to those measured in a conventional capillary driven heat pipe using similar working fluids. The evaporator conductance improved at high power probably due to the onset of nucleate boiling. The maximum heat throughput for this pipe was substantially higher than that of a conventional pipe.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 75-659 , American Institute of Aeronautics and Astronautics, Thermophysics Conference; May 27, 1975 - May 29, 1975; Denver, CO
    Format: text
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  • 7
    Electronic Resource
    Electronic Resource
    The vapor pressure of indium, silver, gallium, copper, tin, and gold between 0.1 and 3.0 bar (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 425-436 
    Details
    ISSN: 1572-9567
    Keywords: copper ; gallium ; gold ; heat pipe ; high temperature ; indium ; liquid metals ; silver ; tin ; vapor pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The vapor pressure of several liquid metals was measured using a method based on the gas-controlled heat pipe. Small samples of the test material were placed in a tungsten tube and heated to temperatures above 2900 K. The vapor pressure was measured using a gas-buffered pressure transducer and the vapor temperature was inferred from the tube surface temperature, which was measured with an optical pyrometer. Most of the tests were terminated by the failure of the containment tube. The measured pressures agree well with those calculated by thermodynamic methods from data at lower temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567103
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    Paper (German National Licenses)
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