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  • 1995-1999  (4)
  • 1999  (3)
  • 1998  (1)
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Materialart
Erscheinungszeitraum
  • 1995-1999  (4)
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Influence of humidity on the convective heat transfer from small cylinders (1998)
    Springer
    Experiments in fluids 24 (1998), S. 141-150 
    Details
    ISSN: 1432-1114
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract  The convective heat transfer from a cylinder to a humid air stream flowing normal to the cylinder was investigated experimentally at atmospheric pressure over a range of variables which is relevant to the use of hot‐wire anemometry: air temperatures between 30 °C and 70 °C and velocities between 12 and 37 m/s. For molar fractions of water vapour up to 0.27, the heat transfer increased with increasing humidity. The ratio of heat transfer rates in humid air and dry air is a unique function of the molar fraction of water vapour, independent of the air temperature and flow velocity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003480050161
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Correction of hot-wire measurements in the near-wall region (1999)
    Springer
    Experiments in fluids 26 (1999), S. 475-477 
    Details
    ISSN: 1432-1114
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003480050312
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003480050281
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  • 4
    Digitale Medien
    Digitale Medien
    Linear stability of non-Newtonian annular liquid sheets (1999)
    Springer
    Acta mechanica 137 (1999), S. 33-42 
    Details
    ISSN: 1619-6937
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01313142
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