Technical Briefs

Gas Void Fraction Measurement in Two-Phase Gas/Liquid Slug Flow Using Acoustic Emission Technology

[+] Author and Article Information
S. Al-lababidi

School of Engineering, Cranfield University, Cranfield MK43 0AL, UKs.allababidi@cranfield.ac.uk

A. Addali, H. Yeung, D. Mba

School of Engineering, Cranfield University, Cranfield MK43 0AL, UK

F. Khan

Fluid Engineering Centre, BHR Group Limited, Cranfield MK43 0AJ, UK

J. Vib. Acoust 131(6), 064501 (Nov 18, 2009) (7 pages) doi:10.1115/1.4000463 History: Received March 31, 2008; Revised May 04, 2009; Published November 18, 2009; Online November 18, 2009

The gas-liquid two-phase slug flow regime phenomenon is commonly encountered in the chemical engineering industry, particularly in oil and gas production transportation pipelines. Slug flow regime normally occurs for a range of pipe inclinations, and gas and liquid flowrates. A pipeline operating in the slug flow regime creates high fluctuations in gas and liquid flowrates at the outlet. Therefore, the monitoring of slugs and the measurement of their characteristics, such as the gas void fraction, are necessary to minimize the disruption of downstream process facilities. In this paper, a correlation between gas void fraction, absolute acoustic emission energy, and slug velocities in a two-phase air/water flow regime was developed using an acoustic emission technique. It is demonstrated that the gas void fraction can be determined by measurement of acoustic emission.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

The process of slug formation by Taitel and Dukler (3)

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Figure 2

Schematic description of the EB and LSB in idealized developed slug flow

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Figure 3

2 in. air/water horizontal flow test facility

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Figure 4

2 in. test section (AE sensor and preamplifier) and conductivity sensor

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Figure 5

AE time waveform and associated frequency spectrum for VSL 1.5 and VSG 1.0

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Figure 6

Test flow regime map

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Figure 7

Surface free energy versus measured gas void fraction in slug body

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Figure 8

Surface free energy versus absolute acoustic energy at VSL=0.6 ms−1

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Figure 9

Contribution of the turbulence kinetic energy on the increase in the absolute

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Figure 10

Absolute AE energy against measured gas void fraction

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Figure 11

Gas void fraction established with the AE model, Eq. 15, for a range of flow velocities

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Figure 12

Comparison of measured and predicted gas void fraction data; proposed correlation




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