A Numerical Study of Entrainment Mechanism in Axisymmetric Annular Gas-Liquid Flow

[+] Author and Article Information
Huawei Han

Faculty of Engineering & Applied Science, University of Ontario Institute of Technology, Oshawa, Ontario, L1H 7K4, Canadacolin.han@uoit.ca

Kamiel Gabriel

 University of Ontario Institute of Technology, Oshawa, Ontario, L1H 7K4, Canadakamiel.gabriel@uoit.ca

J. Fluids Eng 129(3), 293-301 (Aug 09, 2006) (9 pages) doi:10.1115/1.2427078 History: Received October 26, 2005; Revised August 09, 2006

The main purpose of this study is to investigate liquid entrainment mechanisms of annular flow by computational fluid dynamics (CFD) techniques. In the modeling, a transient renormalization group (RNG) k-ε model in conjunction with an enhanced wall treatment method was employed. In order to reconstruct the two-phase interface, the volume of fluid (VOF) geometric reconstruction scheme was adopted. Simulation results indicated that disturbance waves were generated first on the two-phase interface and that their evolution eventually resulted in the liquid entrainment phenomena. The most significant accomplishment of this work is that details of the entrainment mechanism are well described by the numerical simulation work. In addition, two new entrainment phenomena were presented. One entrainment phenomenon demonstrated that the evolution of individual waves caused the onset of liquid entrainment; the other one showed that the “coalescence” of two adjacent waves (during the course of their evolution) played an important role in the progression of liquid entrainment. Further analysis indicated that the two entrainment phenomena are inherently the same entrainment mechanism. The newly developed entrainment mechanism is based on conservation laws.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 2

Wave rolling entrainment mechanism (8)

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Figure 3

Wave coalescence entrainment mechanism (2,11)

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Figure 4

Ripple shearing-off entrainment mechanism (3)

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Figure 1

Wave undercut entrainment mechanism (9)

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Figure 8

Waves in the enlarged wavy region of case II (Vg=6m∕s; Vl=1m∕s); t=2.163s

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Figure 9

Details of wave evolution and liquid entrainment; Case I: Vg=15m∕s; Vl=1m∕s

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Figure 10

Details of wave development and liquid entrainment; Case II: Vg=6m∕s; Vl=1m∕s

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Figure 5

Schematic of the simulation domain

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Figure 6

Slug flow at Vg=0.5m∕s; Vl=1m∕s; and t=1.7268s

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Figure 7

Wave shape and dimensions in the fully developed region; Case II (Vg=6m∕s; Vl=1m∕s) at t=2.163s




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