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TECHNICAL PAPERS

Gas-Liquid Distribution in the Developing Region of Horizontal Intermittent Flows

[+] Author and Article Information
M. Fossa

DITEC, Dipartimento di Termoenergetica e Condizionamento Ambientale, Università degli Studi di Genova, Via all’Opera Pia 15a-16145 Genova, Italye-mail: mfossa@ditec.unige.it

J. Fluids Eng 123(1), 71-80 (Nov 17, 2000) (10 pages) doi:10.1115/1.1343108 History: Received April 05, 2000; Revised November 17, 2000
Copyright © 2001 by ASME
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References

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Nicholson,  M. K., Aziz,  K., and Gregory,  G. A., 1978, “Intermittent Two Phase Flow in Horizontal Pipes: Predictive Models,” Can. J. Chem. Eng., 56, pp. 653–663.
Andreussi,  P., Bendiksen,  K. H., and Nydal,  O. J., 1993, “Void Distribution in Slug Flow,” Int. J. Multiphase Flow, 19, pp. 817–828.
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Fabre, J., Ferschneider, G., and Masbernat, L., 1983, “Intermittent Gas Liquid Flow in Horizontal or Weakly Inclided Pipes,” Proc. Int. Conf. on Physical Modelling of Multiphase Flow, Coventry, U.K.
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Figures

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Calibration of the impedance probe, according to the stratified and bubble phase distributions
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Procedure to infer the liquid level values h and hmin from PDF profiles
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Ratio of void fraction values αBA as obtained from different injector tests
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Nydal map 20 for entry length and present operating conditions
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Liquid holdup tracings at different locations along the test pipe and for different operating conditions
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Area average void fraction as a function of the gas volume fraction. Parameter: distance from the phase injection.
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Calculated values of the constant C0 as defined in (3)
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PDF profiles at different locations along the test pipes
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Typical PDF profiles for stratified flow at the tube inlet (x/D=33) when Vsg>2.5 m/s
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PDF profiles at different gas flow rates
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Transition plug/slug flow by the analysis of PDF: the influence of the increasing gas flow rate on the height of the slug peak
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Slug peak amplitudes for different values of Vsg and Vsl
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Mean liquid levels evaluated from PDF analysis at different locations along the pipe
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Minimum liquid levels evaluated from PDF analysis at different locations along the pipe
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Mean liquid levels evaluated from PDF analysis for different values of Vsl
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Minimum liquid levels evaluated from PDF analysis for different values of Vsl
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The ratio between the minimum and the mean liquid levels at x/D=160
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Power spectral densities of void fraction fluctuations. Parameter: location along the pipe
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Slug frequencies as inferred from FFT analysis and comparison with theoretical models

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