A Single-Beam Multi-Detector Gamma Densitometer for Void Fraction and Phase Distribution Measurements in Transient Two-Phase Flows

  • A. M. C. Chan
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)


Different methods for void fraction and phase distribution measurements in two-phase flow have been used in the past with limited success. In the present paper, the design of a simple single-beam, multi-detector gamma densitometer for void fraction and phase distribution measurements is described. Both static and quasi-static calibrations are presented. It was found that the present design is capable of predicting average void fractions in horizontal pipe flows to within 5% in general. Objective flow regime identification is also possible using the chordal void fluctuations. A simple process of elimination was developed for flow regime identification. The process is particularly suited for transient data reduction using computers.


Flow Regime Test Section Void Fraction Slug Flow Annular Flow 
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  1. Chan, A.M.C. and Banerjee, S., 1981, Design Aspects of Gamma Densitometer for Void Fraction Measurements in Small Scale Two-Phase Flows, Nuclear Instruments and Methods, Vol. 190, 135–148.CrossRefADSGoogle Scholar
  2. Fincke, J.R., Vince, M.A. and Jeffry, C.L., 1982, Measurement of Time-Average Density Distribution in Horizontal Multiphase Flow Using Reconstructive Tomography, Measurements in Polyphase Flows, ed, T.R. Heidrick and B.R. Patel, 37–44.Google Scholar
  3. Heidrick, T.R., Saltvold, J.R. and Banerjee, S., 1975, Application of a Three-Beam Gamma Densitometer to Two-Phase Flow Design and Density Measurements, AIChE Symposium Series, Vol. 73, 234–255.Google Scholar
  4. Hubbard, M.G. and Dukler, A.E., 1966, The Characterization of Flow Regimes for Horizontal Two-Phase Flow: I. Statistical Analysis of Wall Pressure Fluctuations, Proceedings of the 1966 Heat Transfer and Fluid Mechanics Institute, ed, M.A. Saad and J.A. Moller, 100–121, Stranford University Press.Google Scholar
  5. Jeandey, C., 1982, Multibeam X-ray Densitometer for Flow Pattern and Void Fraction Determination in Steam Water Mixtures, Measurements in Polyphase Flows, ed. T.R. Heidrick and B.R. Patel, 19–28.Google Scholar
  6. Jones, O.C., Jr. and Zuber, N., 1975, The Interrelation Between Void Fraction Fluctuations and Flow Patterns in Two-Phase Flow, Int. J. Multiphase Flow, Vol. 2, 273–306.CrossRefGoogle Scholar
  7. Lahey, R.T. Jr., 1978, A Review of Selected Void Fraction and Phase Velocity Measurement Technique, Two-Phase Measurements, Fluid Dynamics Institute Short Course on Two-Phase Flow Measurements, Dartmouth College.Google Scholar
  8. Lassahn, G.D., 1977, LOFT Three-Beam Gamma Densitometer Data Interpretation, TREE-NUREG-1111.Google Scholar
  9. Mandhane, J.M., Gregory, G.A. and Aziz, K., 1974, A Flow Pattern Map for Gas-Liquid Flow in Horizontal Pipes, Int. J. Multiphase Flow, Vol. 1, 537–553.CrossRefGoogle Scholar
  10. Petrick, M. and Swanson, B.S., 1958, Radiation Attenuation Method of Measuring Density of a Two-Phase Fluid, Review of Scientific Instruments, Vol. 29, 1079–1085.CrossRefADSGoogle Scholar
  11. Shumway, R.W. and Cozzuol, J.M., 1978, Measurement of Two Phase Flow Conditions in a Horizontal Pipe Aided by Multi-Beam Gamma Densitometers, Topics of Two-Phase Heat Transfer and Flow, ed. S.G. Bankoff, 213–218.Google Scholar
  12. Smith, A.V., 1975, A Fast Response Multi-Beam X-ray Absorption Technique for Identifying Phase Distribution During Steam Water Slowdowns, J. Br. Nucl. Energy Soc., Vol. 14, 227–235.ADSGoogle Scholar
  13. Tsuja, Y. and Morikawa, Y., 1982, Flow Pattern and Pressure Fluctuation in Air-Solid Two-Phase Flow in a Pipe at Low Air Velocities, Int. J. Multiphase Flow, Vol. 8, 329–341.CrossRefGoogle Scholar
  14. Tutu, N.K., 1982, Pressure Fluctuations and Flow Pattern Recognition in Vertical Two-Phase Gas-Liquid Flows, Int. J. Multiphase Flow, Vol. 8, 443–447.CrossRefGoogle Scholar
  15. Vince, M.A. and Lahey, R.T., Jr., 1982, On the Development of an Objective Flow Regime Indicator, Int. J. Multiphase Flow, Vol. 8, 93–124.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin, Heidelberg 1984

Authors and Affiliations

  • A. M. C. Chan
    • 1
  1. 1.Mechanical Research DepartmentOntario HydroTorontoCanada

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