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Experimental Research on Axially Excited Rotating Liquid-Liquid Systems

  • J. Siekmann
  • D. Raake

Abstract

The natural modes and natural frequencies of an incompressible and immiscible fluid system (petrolether 40/60 and water), enclosed in an axially excited and rapidly rotating cylindrical tank, are studied experimentally in dependence on different and variable parameters: the tank diameter, the geometric ratio (tank height/tank diameter), the filling ratio, the rotational tank frequency and the excitation frequency. The undisturbed cylindrical surface, being parallel to the direction of gravity, is generated by a high rotational frequency. Due to an axial excitation, a disturbance of the interface occurs. The resulting natural modes are documented photographically. In order to analyze the experimental data, dimensionless numbers are introduced, namely the Bond number, the ratio of the tank height to a mean radius of the phase boundary between the fluids, and the frequency ratio. The experimental procedure is described and the results are discussed critically.

Keywords

Excitation Frequency Rotational Frequency Natural Mode Bond Number Dimensionless Frequency 
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References

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    Siekmann, J. and Raake, D.: Experimental investigation of the natural modes of immiscible liquids enclosed in an axially excited rapidly rotating vessel. Abstracts Ninth European Symposium GRAVITY-DEPENDENT PHENOMENA IN PHYSICAL SCIENCES, Berlin, Germany, 2–5 May 1995, pp. 315–316, DARA, TU Berlin, ESA, Symposium Organizer Professor M.J. Fecht, Technical University Berlin (1995).Google Scholar
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    Raake, D. and Siekmann, J.: Axially excited natural frequencies in a rapidly rotating cylindrical container. Z. Flugwiss. Weltraumforsch. 15 (1991), 289–296.Google Scholar
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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • J. Siekmann
    • 1
  • D. Raake
    • 1
  1. 1.Chair of MechanicsUniversity-GH EssenEssenGermany

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