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Properties of Kinematic Waves in Two-Phase Pipe Flows

  • J. A. Boure
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)

Abstract

In two-phase pipe flows, the slip velocity or, equivalently, the drift flux is related to the void fraction. This leads to the occurrence of kinematic waves which convey void fraction signals. Kinematic waves have been investigated experimentally in air-water two-phase flows by inducing small void fraction disturbances at the inlet of vertical ducts, the average void fraction varying from 0.01 (bubbly flows) to 0.41 (slug flows). The temporal fluctuations of the void fraction are detected in regularly spaced cross sections by non intrusive impedance probes. The statistical processing of the data reveals the existence of two kinematic modes and provides their velocities and damping or amplification coefficients. The results are presented and discussed. One of the modes, practically absent at low void fractions, is predominant at larger void fractions. As the void fraction increases it changes from damped to amplified and controls the bubble slug transition

Keywords

Void Fraction Successive Probe Slug Flow Bubbly Flow Apparent Velocity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • J. A. Boure
    • 1
  1. 1.Service d’Etudes Thermohydrauliques, 85 XCommissariat à l’Energie Atomique, Centre d’Etudes Nucléaires de GrenobleGrenoble CedexFrance

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