The University of Southampton
University of Southampton Institutional Repository

Modelling of particle paths passing through an ultrasonic standing wave

Townsend, R.J., Hill, M., Harris, N.R. and White, N.M. (2004) Modelling of particle paths passing through an ultrasonic standing wave Ultrasonics, 42, (1-9), pp. 319-324. (doi:10.1016/j.ultras.2004.01.025).

Record type: Article

Abstract

Within an ultrasonic standing wave particles experience acoustic radiation forces causing agglomeration at the nodal planes of the wave. The technique can be used to agglomerate, suspend, or manipulate particles within a flow. To control agglomeration rate it is important to balance forces on the particles and, in the case where a fluid/particle mix flows across the applied acoustic field, it is also necessary to optimise fluid flow rate.
To investigate the acoustic and fluid forces in such a system a particle model has been developed, extending an earlier model used to characterise the 1-dimensional field in a layered resonator. In order to simulate fluid drag forces, CFD software has been used to determine the velocity profile of the fluid/particle mix passing through the acoustic device. The profile is then incorporated into a MATLAB model. Based on particle force components, a numerical approach has been used to determine particle paths. Using particle coordinates, both particle concentration across the fluid channel and concentration through multiple outlets are calculated.
Such an approach has been used to analyse the operation of a microfluidic flow-through separator, which uses a half wavelength standing wave across the main channel of the device. This causes particles to converge near the axial plane of the channel, delivering high and low particle concentrated flow through two outlets, respectively. By extending the model to analyse particle separation over a frequency range, it is possible to identify the resonant frequencies of the device and associated separation performance.
This approach will also be used to improve the geometric design of the microengineered fluid channels, where the particle model can determine the limiting fluid flow rate for separation to occur, the value of which is then applied to a CFD model of the device geometry.

Full text not available from this repository.

More information

Published date: 2004
Keywords: radiation force, cfd, standing waves, concentration

Identifiers

Local EPrints ID: 22728
URI: http://eprints.soton.ac.uk/id/eprint/22728
ISSN: 0041-624X
PURE UUID: 4fb5bf30-ada5-4309-8ab8-e70aa394fade
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
ORCID for N.M. White: ORCID iD orcid.org/0000-0003-1532-6452

Catalogue record

Date deposited: 16 Mar 2006
Last modified: 17 Jul 2017 16:21

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×