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Acoustic detection of gas bubbles in a pipe

Acoustic detection of gas bubbles in a pipe
Acoustic detection of gas bubbles in a pipe
This report describes an acoustic system designed to detect gas bubbles in a pipe. The system makes simultaneous use of multiple techniques for detection and sizing; these include six resonance-based indicators, as well as off-resonance scattering. The abilities of these acoustic indicators to detect, size and count bubbles are compared. It was envisaged that using several simultaneous bubble detection techniques would compensate for restrictions inherent in the isolated use of individual techniques. For example, whilst geometric scattering tends to be more successful at locating bubbles than sizing them, the converse tends to hold for techniques which exploit the bubble resonance. In the latter case, the greater the tolerance allowed in the estimation of the bubble size from the measured resonance frequency, the more approximate may be the conversion algorithm. Single bubbles tethered to a wire in the pipe, and a freely rising stream of similar size bubbles, are examined. Results measured in these two cases are presented to indicate the potential of the location and sizing techniques. The effect on bubble resonance frequencies of confining the bubble in a pipe is considered in detail. Standard interpretations of bubble resonances in terms of bubble size assume free-field conditions, and require modification for the pipe environment. The necessary corrections are presented for the frequency range below the first transverse acoustic resonance of the pipe
1610-1928
801-814
Leighton, T.G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Ramble, D.G.
9e0accbe-54f4-445d-a542-cc3c293f47fe
Phelps, A.D.
3f987d72-7fdd-4282-9a58-9ec5f9effcf2
Morfey, C.L.
d5f9a8d0-7d8a-4915-a522-bf49dee111f2
Harris, P.P.
2637209b-3059-4284-a377-4f54ad61b01d
Leighton, T.G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Ramble, D.G.
9e0accbe-54f4-445d-a542-cc3c293f47fe
Phelps, A.D.
3f987d72-7fdd-4282-9a58-9ec5f9effcf2
Morfey, C.L.
d5f9a8d0-7d8a-4915-a522-bf49dee111f2
Harris, P.P.
2637209b-3059-4284-a377-4f54ad61b01d

Leighton, T.G., Ramble, D.G., Phelps, A.D., Morfey, C.L. and Harris, P.P. (1998) Acoustic detection of gas bubbles in a pipe. Acta Acustica united with Acustica, 84 (5), 801-814.

Record type: Article

Abstract

This report describes an acoustic system designed to detect gas bubbles in a pipe. The system makes simultaneous use of multiple techniques for detection and sizing; these include six resonance-based indicators, as well as off-resonance scattering. The abilities of these acoustic indicators to detect, size and count bubbles are compared. It was envisaged that using several simultaneous bubble detection techniques would compensate for restrictions inherent in the isolated use of individual techniques. For example, whilst geometric scattering tends to be more successful at locating bubbles than sizing them, the converse tends to hold for techniques which exploit the bubble resonance. In the latter case, the greater the tolerance allowed in the estimation of the bubble size from the measured resonance frequency, the more approximate may be the conversion algorithm. Single bubbles tethered to a wire in the pipe, and a freely rising stream of similar size bubbles, are examined. Results measured in these two cases are presented to indicate the potential of the location and sizing techniques. The effect on bubble resonance frequencies of confining the bubble in a pipe is considered in detail. Standard interpretations of bubble resonances in terms of bubble size assume free-field conditions, and require modification for the pipe environment. The necessary corrections are presented for the frequency range below the first transverse acoustic resonance of the pipe

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Published date: 1998
Organisations: Acoustics Group

Identifiers

Local EPrints ID: 349546
URI: https://eprints.soton.ac.uk/id/eprint/349546
ISSN: 1610-1928
PURE UUID: c3e064d1-355a-4985-a300-26948a7e0c59
ORCID for T.G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750

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Date deposited: 07 Mar 2013 13:47
Last modified: 06 Jun 2018 13:08

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Contributors

Author: T.G. Leighton ORCID iD
Author: D.G. Ramble
Author: A.D. Phelps
Author: C.L. Morfey
Author: P.P. Harris

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