A Single-Beam Multi-Detector Gamma Densitometer for Void Fraction and Phase Distribution Measurements in Transient Two-Phase Flows
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.
KeywordsNickel Attenuation Cobalt Steam Poss
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- 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
- 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
- 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
- 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
- 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
- Lassahn, G.D., 1977, LOFT Three-Beam Gamma Densitometer Data Interpretation, TREE-NUREG-1111.Google Scholar
- 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