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  • stagnation pressure  (1)
  • thermal spraying  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Thermally Induced Measurement Error by a Water-Cooled Enthalpy Probe (1998)
    Springer
    Plasma chemistry and plasma processing 18 (1998), S. 53-71 
    Details
    ISSN: 1572-8986
    Keywords: Enthalpy probe ; systematic error ; stagnation pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Errors in stagnation-pressure measurement, due to a large temperature gradient at the face of a water-cooled enthalpy probe, were experimentally measured and numerically simulated. Two probes were used to measure the stagnation-pressure in a dc plasma jet; a standard water-cooled enthalpy probe and an uncooled ceramic (Thoria) probe. There was a maximum difference of 10% between the two measurements, with the water-cooled probe measuring lower pressures. Numerical simulations of plasma flow around the probe showed that the magnitude of the error depends on the thickness of the thermal boundary layer. The measurement error causes a maximum of 3% error in velocity measurements, using the Bernoulli equation. This error is no worse than other measurement errors associated with water-cooled enthalpy probe meaurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021789226599
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A new nozzle design for dc plasma spray guns (1995)
    Springer
    Plasma chemistry and plasma processing 15 (1995), S. 607-628 
    Details
    ISSN: 1572-8986
    Keywords: Argon plasma jets ; thermal spraying ; shrouded nozzles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract A new design is proposed for dc plasma spray gas shroud attachments. It has been found experimentally that the performance of a conventional conical gas shroud is not satisfactory due to the entrainment of the cold air inside the gas shroud. Numerical simulations confirmed this finding. Parameters such as the cone angle and the main gas flow rate can significantly influence the flow pattern inside the nozzle, resulting in air entrainnient and formation of a circulation zone at the exit region. A new design is proposed which can considerably improve the performance of shrouded nozzles. The superior performance of the proposed design has been demonstrated by numerical simulation. The new design is based on a modification of the conical shape by optimizing the profile of the nozzle from a conical shape with a constant angle to a streamlined configuration. The optimized shape was obtained from an analysis of the streamlines of a fixed angle nozzle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01447063
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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