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Measurement of species flux from a bubble using an acousto-electrochemical technique

Measurement of species flux from a bubble using an acousto-electrochemical technique
Measurement of species flux from a bubble using an acousto-electrochemical technique
An acousto-electrochemical technique is presented which, for the first time, offers the potential for measuring the flux of dissolved species in a liquid resulting from bubbles of a specific chosen size in the population. Laboratory trials are presented, but the device itself was damaged in the surf zone and no data was obtained from the ocean deployment. Nevertheless, the preceding laboratory tests demonstrate the viability of the technique. The device responds to perturbations of the fluid around a small electrode. Three such sources of motion must be characterised if it is to achieve the objective stated above. First, the perturbations resulting form the translatory motions of bubbles in the liquid. To obtain bubble radius resolution in the measurement of mass flux, however, it is necessary to apply to driving (‘pump’) sound field. Bubbles close to resonance will, in addition to a translatory motion, impart to the liquid a component of mass flux at the pump frequency. This is detected. However to show that this is the result of bubble wall pulsation, and not someother coupling, the amplitude of the pump field is increased until the electrochemical sensor detects Faraday waves on the bubble wall. Not only does this prove the relation between mass flux to bubble wall motion, it provides a second route by which the radius-resolved component of mass flux might be identified. In these preliminary laboratory tests, electrochemical detection of these motions was achieved through the observation of current produced by the reduction of a suitable redox agent present within the liquid phase of the solution employed. Preparations were made to obtain preliminary data from the Hurst Spit 2000 surf zone trial, but the device was damaged by the environment.
2
242-249
Institute of Acoustics
Birkin, P.R.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Watson, Y.E.
48a8ba6c-6bed-48c2-b173-2cf440991a98
Smith, K.L.
a5d7bde4-722a-4989-92dc-86dd85d26786
Leighton, T.G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Simpson, M.D.
e54519dc-bbde-4c4e-8141-8fdc527b0936
Leighton, T.G.
Heald, G.J.
Griffiths, H.
Griffiths, G.
Birkin, P.R.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Watson, Y.E.
48a8ba6c-6bed-48c2-b173-2cf440991a98
Smith, K.L.
a5d7bde4-722a-4989-92dc-86dd85d26786
Leighton, T.G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Simpson, M.D.
e54519dc-bbde-4c4e-8141-8fdc527b0936
Leighton, T.G.
Heald, G.J.
Griffiths, H.
Griffiths, G.

Birkin, P.R., Watson, Y.E., Smith, K.L., Leighton, T.G. and Simpson, M.D. (2001) Measurement of species flux from a bubble using an acousto-electrochemical technique. Leighton, T.G., Heald, G.J., Griffiths, H. and Griffiths, G. (eds.) In 'Acoustical Oceanography', Proceedings of the Institute of Acoustics. vol. 23, Institute of Acoustics. pp. 242-249 .

Record type: Conference or Workshop Item (Paper)

Abstract

An acousto-electrochemical technique is presented which, for the first time, offers the potential for measuring the flux of dissolved species in a liquid resulting from bubbles of a specific chosen size in the population. Laboratory trials are presented, but the device itself was damaged in the surf zone and no data was obtained from the ocean deployment. Nevertheless, the preceding laboratory tests demonstrate the viability of the technique. The device responds to perturbations of the fluid around a small electrode. Three such sources of motion must be characterised if it is to achieve the objective stated above. First, the perturbations resulting form the translatory motions of bubbles in the liquid. To obtain bubble radius resolution in the measurement of mass flux, however, it is necessary to apply to driving (‘pump’) sound field. Bubbles close to resonance will, in addition to a translatory motion, impart to the liquid a component of mass flux at the pump frequency. This is detected. However to show that this is the result of bubble wall pulsation, and not someother coupling, the amplitude of the pump field is increased until the electrochemical sensor detects Faraday waves on the bubble wall. Not only does this prove the relation between mass flux to bubble wall motion, it provides a second route by which the radius-resolved component of mass flux might be identified. In these preliminary laboratory tests, electrochemical detection of these motions was achieved through the observation of current produced by the reduction of a suitable redox agent present within the liquid phase of the solution employed. Preparations were made to obtain preliminary data from the Hurst Spit 2000 surf zone trial, but the device was damaged by the environment.

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Published date: 2001

Identifiers

Local EPrints ID: 10226
URI: http://eprints.soton.ac.uk/id/eprint/10226
PURE UUID: 8c9009a6-640d-4540-9ab2-9bfa6716e4ed
ORCID for P.R. Birkin: ORCID iD orcid.org/0000-0002-6656-4074
ORCID for T.G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750

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Date deposited: 12 Oct 2005
Last modified: 16 Mar 2024 02:46

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Contributors

Author: P.R. Birkin ORCID iD
Author: Y.E. Watson
Author: K.L. Smith
Author: T.G. Leighton ORCID iD
Author: M.D. Simpson
Editor: T.G. Leighton
Editor: G.J. Heald
Editor: H. Griffiths
Editor: G. Griffiths

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