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Performance of a quarter-wavelength particle concentrator

Performance of a quarter-wavelength particle concentrator
Performance of a quarter-wavelength particle concentrator
A series of devices have been investigated which use acoustic radiation forces to concentrate micron sized particles. These multi-layered resonators use a quarter wavelength resonance in order to position an acoustic pressure node close to the top surface of a fluid layer such that particles migrate towards this surface. As flow through devices, it is then possible to collect a concentrate of particulates by drawing off the particle stream and separating it from the clarified fluid and so can operate continuously as opposed to batch processes such as centrifugation. The methods of construction are described which include a micro-fabricated, wet-etched device and a modular device fabricated using a micro-mill. These use silicon and macor, a machinable glass ceramic, as a carrier layer between the transducer and fluid channel, respectively. Simulations using an acoustic impedance transfer model are used to determine the influence of various design parameters on the acoustic energy density within the fluid layer and the nodal position. Concentration tests have shown up to 4.4-, 6.0- and 3.2 fold increases in concentration for 9, 3 and 1 ?m diameter polystyrene particles, respectively. The effect of voltage and fluid flow rates on concentration performance is investigated and helps demonstrate the various factors which determine the increase in concentration possible.
acoustic radiation force, concentration, particle separation, suspension, bio-sensing.
0041-624X
515-520
Townsend, R.J.
0452b21c-a758-4d4a-925b-1511d9296d62
Hill, M.
0cda65c8-a70f-476f-b126-d2c4460a253e
Harris, N.R.
237cfdbd-86e4-4025-869c-c85136f14dfd
McDonnell, M.B
4f489766-442d-447c-bfe2-ecf1c199610f
Townsend, R.J.
0452b21c-a758-4d4a-925b-1511d9296d62
Hill, M.
0cda65c8-a70f-476f-b126-d2c4460a253e
Harris, N.R.
237cfdbd-86e4-4025-869c-c85136f14dfd
McDonnell, M.B
4f489766-442d-447c-bfe2-ecf1c199610f

Townsend, R.J., Hill, M., Harris, N.R. and McDonnell, M.B (2008) Performance of a quarter-wavelength particle concentrator. Ultrasonics, 48 (6-7), 515-520. (doi:10.1016/j.ultras.2008.06.005).

Record type: Article

Abstract

A series of devices have been investigated which use acoustic radiation forces to concentrate micron sized particles. These multi-layered resonators use a quarter wavelength resonance in order to position an acoustic pressure node close to the top surface of a fluid layer such that particles migrate towards this surface. As flow through devices, it is then possible to collect a concentrate of particulates by drawing off the particle stream and separating it from the clarified fluid and so can operate continuously as opposed to batch processes such as centrifugation. The methods of construction are described which include a micro-fabricated, wet-etched device and a modular device fabricated using a micro-mill. These use silicon and macor, a machinable glass ceramic, as a carrier layer between the transducer and fluid channel, respectively. Simulations using an acoustic impedance transfer model are used to determine the influence of various design parameters on the acoustic energy density within the fluid layer and the nodal position. Concentration tests have shown up to 4.4-, 6.0- and 3.2 fold increases in concentration for 9, 3 and 1 ?m diameter polystyrene particles, respectively. The effect of voltage and fluid flow rates on concentration performance is investigated and helps demonstrate the various factors which determine the increase in concentration possible.

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More information

Submitted date: 8 June 2007
Published date: November 2008
Keywords: acoustic radiation force, concentration, particle separation, suspension, bio-sensing.
Organisations: EEE

Identifiers

Local EPrints ID: 266903
URI: http://eprints.soton.ac.uk/id/eprint/266903
ISSN: 0041-624X
PURE UUID: af544994-e3f0-40b9-94cb-b0fb8c6668d0
ORCID for M. Hill: ORCID iD orcid.org/0000-0001-6448-9448
ORCID for N.R. Harris: ORCID iD orcid.org/0000-0003-4122-2219

Catalogue record

Date deposited: 10 Nov 2008 17:53
Last modified: 15 Mar 2024 02:46

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Contributors

Author: R.J. Townsend
Author: M. Hill ORCID iD
Author: N.R. Harris ORCID iD
Author: M.B McDonnell

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