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Research Papers: Multiphase Flows

A Simplified Approach for Predicting the Intermittent Behavior of Gas-Liquid Mixtures in Pipes

[+] Author and Article Information
M. Fossa

Dipartimento di Ingegneria della Produzione, Termoenergetica e Modelli Matematici (DIPTEM), Università degli Studi di Genova, Via all’Opera Pia 15a, 16145 Genova, Italy

A. Marchitto1

Dipartimento di Ingegneria della Produzione, Termoenergetica e Modelli Matematici (DIPTEM), Università degli Studi di Genova, Via all’Opera Pia 15a, 16145 Genova, Italyanna@ditec.unige.it

1

Corresponding author.

J. Fluids Eng 131(1), 011304 (Dec 08, 2008) (7 pages) doi:10.1115/1.2953296 History: Received August 27, 2007; Revised March 26, 2008; Published December 08, 2008

A new approach to the classical slug flow model is here proposed based on an original correlation for the minimum liquid level in the stratified regions of intermittent horizontal flows. This correlation is obtained by fitting experimental data obtained from a statistical analysis of void fraction signals from ring impedance probes. The new procedure improves the original model in terms of computing time reduction and algorithm simplification. In addition, it is demonstrated that the new closure relationship can be derived with more consistent experimental results, with respect to the slug length, which is employed in the original approach. The predictions of the main flow parameters are presented with reference to the classical and new approach, and all the results are critically compared with literature experimental data. It is demonstrated that the simplified procedure is able to predict the pressure drops and average void fraction values in good agreement with experimental measurements, while only the slug frequency and slug length predictions are affected by poor reliability.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Slug flow geometry

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Figure 2

Void fraction PDF for flow parameter evaluation

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Figure 3

Predicted and measured minimum liquid levels (D=40mm) and comparison with literature data

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Figure 4

Pressure multiplier versus gas volume fraction; (a) VSL=1.1m∕s; (b) VSL=2.0m∕s

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Figure 5

Average void fraction versus gas volume fraction; (a) D=40mm; (b) D=60mm

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Figure 6

Minimum film level measured values versus the predictions by the classical procedure (cla). Filled symbols, D=40mm; open symbols, D=60mm

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Figure 7

Pressure multiplier values determined with classical and modified procedures for phase density ratios in the range of 100–1000 and liquid viscosities in the range of 0.001–0.3kg∕ms

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Figure 8

Average liquid holdup values determined with classical and modified procedures for phase density ratios in the range of 100–1000 and liquid viscosities in the range of 0.001–0.3kg∕ms

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