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  • 1995-1999  (3)
  • 1999  (3)
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  • 1995-1999  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Velocity profile measurement of the Taylor vortex flow of a magnetic fluid using the ultrasonic Doppler method (1999)
    Springer
    Experiments in fluids 26 (1999), S. 208-214 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  A successful application of the ultrasound velocity profile (UVP) measuring technique to investigations on the flow of magnetic fluids is described. The flow structure of a magnetic fluid in a concentric annular geometry with a large aspect ratio of 20 and a radius ratio of 0.65 was investigated for a inner cylinder rotation. Axial velocity distributions were measured using the UVP measuring technique. A non-uniform magnetic field was applied to the flow field using a permanent magnet located on the outside of the cylinders. The energy spectral density was calculated from the periodic axial velocity profiles. The critical Reynolds number was obtained for various magnetic field strengths, and the apparent viscosity caused by the applied magnetic field was estimated. The UVP method was demonstrated to provide useful information on the structure of Taylor vortex flow in a magnetic fluid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003480050281
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Correction of hot-wire measurements in the near-wall region (1999)
    Springer
    Experiments in fluids 26 (1999), S. 475-477 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  A detailed numerical investigation on the corrections needed by hot-wire velocity measurements in wall vicinity was performed. In the case of a perfectly conducting wall the computed results agreed well with available experimental data. At first, the numerical results for the case of an adiabatic wall contradicted previous experimental observations. However, a precise evaluation led to a better understanding of the entire problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003480050312
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Linear stability of non-Newtonian annular liquid sheets (1999)
    Springer
    Acta mechanica 137 (1999), S. 33-42 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary This paper reports a linear stability analysis of a non-Newtonian annular liquid sheet that is surrounded by nonviscous fluids in relative axial motion to it. It is shown that for a stress free basic flow the dispersion relation giving the absolute and convective instability mechanisms can be immediately obtained from the dispersion relation for a Newtonian sheet by introducing a wavenumber dependent “viscosity”. The stability behavior of the sheet is investigated numerically by a continuation algorithm, by which the solution branches of the dispersion relation, relevant for the stability information, can be traced. The results give a stability picture which covers the whole range of annular sheets from the cylindrical jet to the plane liquid curtain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313142
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    Paper (German National Licenses)
    Fulltext
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