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Sound absorption by suspensions of nonspherical particles: measurements compared with predictions using various particle sizing techniques

Sound absorption by suspensions of nonspherical particles: measurements compared with predictions using various particle sizing techniques
Sound absorption by suspensions of nonspherical particles: measurements compared with predictions using various particle sizing techniques
Knowledge of the particle size distribution is required in order to predict ultrasonic absorption in polydisperse particulate suspensions. This paper shows that the method used to measure the particle size distribution can lead to important differences in the predicted absorption. A reverberation technique developed for measuring ultrasonic absorption by suspended particles is used to measure the absorption in suspensions of nonspherical particles. Two types of particulates are studied: (i) kaolin (china clay) particles which are platelike in form; and (ii) calcium carbonate particles which are more granular. Results are compared to theoretical predictions of visco-inertial absorption by suspensions of spherical particles. The particle size distributions, which are required for these predictions, are measured by laser diffraction, gravitational sedimentation and centrifugal sedimentation, all of which assume spherical particles. For a given sample, each sizing technique yields a different size distribution, leading to differences in the predicted absorption. The particle size distributions obtained by gravitational and centrifugal sedimentation are reinterpreted to yield a representative size distribution of oblate spheroids, and predictions for absorption by these spheroids are compared with the measurements. Good agreement between theory and measurement for the flat kaolin particles is obtained, demonstrating that these particles can be adequately represented by oblate spheroids.
0001-4966
1841-1850
Richards, S.D.
5c0cc1ad-1f1d-4bef-9ff5-6468a51a5b0b
Leighton, T.G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Brown, N.R.
b5a5dac4-a928-42a4-b472-e7b6cac6357b
Richards, S.D.
5c0cc1ad-1f1d-4bef-9ff5-6468a51a5b0b
Leighton, T.G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Brown, N.R.
b5a5dac4-a928-42a4-b472-e7b6cac6357b

Richards, S.D., Leighton, T.G. and Brown, N.R. (2003) Sound absorption by suspensions of nonspherical particles: measurements compared with predictions using various particle sizing techniques. Journal of the Acoustical Society of America, 114 (4), 1841-1850. (doi:10.1121/1.1610449).

Record type: Article

Abstract

Knowledge of the particle size distribution is required in order to predict ultrasonic absorption in polydisperse particulate suspensions. This paper shows that the method used to measure the particle size distribution can lead to important differences in the predicted absorption. A reverberation technique developed for measuring ultrasonic absorption by suspended particles is used to measure the absorption in suspensions of nonspherical particles. Two types of particulates are studied: (i) kaolin (china clay) particles which are platelike in form; and (ii) calcium carbonate particles which are more granular. Results are compared to theoretical predictions of visco-inertial absorption by suspensions of spherical particles. The particle size distributions, which are required for these predictions, are measured by laser diffraction, gravitational sedimentation and centrifugal sedimentation, all of which assume spherical particles. For a given sample, each sizing technique yields a different size distribution, leading to differences in the predicted absorption. The particle size distributions obtained by gravitational and centrifugal sedimentation are reinterpreted to yield a representative size distribution of oblate spheroids, and predictions for absorption by these spheroids are compared with the measurements. Good agreement between theory and measurement for the flat kaolin particles is obtained, demonstrating that these particles can be adequately represented by oblate spheroids.

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Published date: 2003

Identifiers

Local EPrints ID: 10356
URI: http://eprints.soton.ac.uk/id/eprint/10356
ISSN: 0001-4966
PURE UUID: e47238d3-8a88-4e51-928a-83c6eb5d1d3d
ORCID for T.G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750

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Date deposited: 19 Jan 2005
Last modified: 16 Mar 2024 02:44

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Contributors

Author: S.D. Richards
Author: T.G. Leighton ORCID iD
Author: N.R. Brown

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