Evolution of flow patterns, gas fraction profiles and bubble size distributions in gas-liquid flows in vertical tubes


Evolution of flow patterns, gas fraction profiles and bubble size distributions in gas-liquid flows in vertical tubes

Lucas, D.; Krepper, E.; Prasser, H.-M.

Air-water flow at ambient conditions in a vertical pipe with an inner diameter of 51.2mm is investigated. An electrode wire-mesh sensor enables the measurement of the phase distribution with a very high resolution in space and in time. Local bubble size distributions are calculated from the data. The measurements were done in different distances from the gas injection device. As a result the development of bubble size distributions as well as the development of the radial gas fraction profiles can be studied. It was found, that the bubble size distribution as well as local effects determine the transition from bubble flow to slug flow. The data are used for the development of a model, which predicts the development of the bubble size distribution and the transition from bubble flow to slug flow in case of stationary flow in a vertical pipe.

Keywords: Two-phase flow; Flow pattern transition; Bubble Flow; Slug flow

  • Lecture (Conference)
    HEAT 2002: Third International Conference Transport Phenomena in Multiphase Systems, Baranow Sandomierski, Poland, June 24-27, 2002, pp. 341 - 348
  • Transactions of the Institute of Fluid-Flow Machinery 112(2003)37-46
  • Contribution to proceedings
    HEAT 2002: Third International Conference Transport Phenomena in Multiphase Systems, Baranow Sandomierski, Poland, June 24-27, 2002, pp. 341 - 348

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Publ.-Id: 4404