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Research Papers: Multiphase Flows

Separation of a Two-Phase Slug Flow in Branched 90 deg Elbows

[+] Author and Article Information
F. Sanchez-Silva

LABINTHAP-SEPI-ESIME, UPALM, National Polytechnic Institute of Mexico, Avenue IPN s/n, Edificio 5, Colonia Lindavista, Delegacion GAM, Mexico City D.F. 07738, Mexicofsnchz@yahoo.com.mx

V. Hernandez-Perez

School of Chemical Environmental and Mining Engineering, University of Nottingham, University Park NG7 2RD, UKhepv@yahoo.com.mx

I. Carvajal-Mariscal1

LABINTHAP-SEPI-ESIME, UPALM, National Polytechnic Institute of Mexico, Avenue IPN s/n, Edificio 5, Colonia Lindavista, Delegacion GAM, Mexico City D.F. 07738, Mexicoicarvajal@ipn.mx

J. G. Barbosa-Saldaña

LABINTHAP-SEPI-ESIME, UPALM, National Polytechnic Institute of Mexico, Avenue IPN s/n, Edificio 5, Colonia Lindavista, Delegacion GAM, Mexico City D.F. 07738, Mexicojgabriel_bs@yahoo.com.mx

J. A. Cruz-Maya

Department of Advanced Technologies, SEPI-UPIITA, National Polytechnic Institute of Mexico, Avenue IPN 5209, Laguna Ticoman, Mexico City D. F. 07340, Mexicojcmaya@ipn.mx

1

Corresponding author.

J. Fluids Eng 132(5), 051301 (Apr 27, 2010) (8 pages) doi:10.1115/1.4001488 History: Received March 19, 2009; Revised March 09, 2010; Published April 27, 2010; Online April 27, 2010

Novel experimental data for phase separation of air-water mixtures in horizontal 90 deg branched elbows are presented in this work. The branched elbows were formed by attaching a pipe to a 90 deg elbow on the side of maximum radius of curvature, and halfway between the inlet and outlet sections of the elbow. All three arms coming from the junction were in the horizontal plane. Both the branch orientation and branch diameter were varied. Three different branch/elbow diameter ratios were tested, as well as three different branch inclination angles. In addition, the static pressure was monitored at different points along the ramified elbow using a set of pressure transducers in order to analyze and associate the pressure drop with the phase separation. At the inlet section of the elbow, the two-phase flow pattern was mainly slug flow. Based on the experimental data, a correlation for the liquid phase separation is proposed. Finally, the volume-weighted phase separation in the branched elbow was compared with the phase separations on the T-junction, and it was found that in some cases the branched elbows have a similar performance to that of the T-junctions.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental setup

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Figure 2

Main parameters of the branched elbow in the horizontal plane

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Figure 3

Experimental flow conditions (●)—25 combinations of gas and liquid superficial velocities

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Figure 4

Effect of the branch inclination. Elbow with d3/d1=0.25 and USL1=0.64 m/s

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Figure 5

Effect of the diameters ratio (d3/d1), θ=15 deg, and USL1=0.64 m/s: (a) on the liquid splitting WL3/WL1; (b) on the gas splitting WG3/WG1

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Figure 6

Effect of the USG1 for different USL1: (a) on the liquid splitting WL3/WL1; (b) on the gas splitting WG3/WG1. Elbow with d3/d1=1 and θ=15 deg.

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Figure 7

Effect of the inlet liquid superficial velocity on splitting of (a) liquid and (b) gas. Elbow with d3/d1=1 and θ=15 deg.

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Figure 8

Pressure drop measurement technique in the branched elbow

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Figure 9

Pressure and pressure drop for the elbow with d3/d1=1 and θ=15 deg

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Figure 10

Pressure drop Δp1–2 and Δp1–3 for the case d3/d1=0.25 and θ=15 deg

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Figure 11

Conventional expressions of the phase split results (18)

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Figure 12

Comparison between a T-junction and the branched elbow with a branch inclination of 15 deg, as phase separators, for d3/d1=1

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Figure 13

Curve of adjustment of the phase separation data

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