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Investigation of Ultrasonic Acoustic Standing Wave Separation of Particles in a Multi-wavelength Macro-scale Resonator Open Access


Other title
Multi-wavelength resonator
Particle Tracking Velocimetry
Ultrasonic standing wave
Type of item
Degree grantor
University of Alberta
Author or creator
Setayeshgar, Alireza
Supervisor and department
Koch, Charles (Mechanical Engineering)
Nobes, David (Mechanical Engineering)
Examining committee member and department
Nobes, David (Mechanical Engineering, University of Alberta)
Siddiqui, Kamran (Faculty of Engineering, The University of Western Ontario)
Olfert, Jason(Mechanical Engineering, University of Alberta)
Sanders, Sean (Chemical and Materials Engineering, University of Alberta)
Koch, Charles (Mechanical Engineering, University of Alberta)
Lipsett, Michael (Mechanical Engineering, University of Alberta)
Department of Mechanical Engineering

Date accepted
Graduation date
Doctor of Philosophy
Degree level
This thesis presents an investigation of macro-scale (>5mm) multi-wavelength acoustophoresis. This is a technique used for the filtration of micro-particles from the containing suspension. It uses the primary acoustic force generated by an ultrasonic acoustic pressure standing wave. Primary acoustic force is isolated in different multi-wavelength acoustic separator experiments and imaging methods are used to capture the motion of particles separating from the containing fluid. Different investigation methods and models for analyzing the macro-scale acoustic resonators are developed and the experimented acoustic resonators are characterized. A particle tracking velocimetry (PTV) approach for measuring individual particle motion is developed specifically to track particles over the lifetime of their motion as they densify to an acoustic pressure node. The applicability of primary acoustic force theory to the macro-scale acoustic resonators is validated by applying the PTV method to images of densification of mono-disperse size and poly-dispersed size particles. Utilizing the developed validated PTV method, the acoustic energy density, a parameter that can only be derived from experiments is also determined. A probability density function (PDF) modeling the location of particles for determination of acoustic energy density is also developed which is in agreement with the PTV method. The influence of dampening and scattering of the acoustic wave in macro-scale multi-wavelength is studied. This is performed by variation of piezo-electric transducer (PZT) voltage and changing the viscosity of the suspension by using different solutions of glycerol in water. The resulting acoustic energy density dependence on PZT voltage in macro-scale multi-wavelength acoustic resonators is observed to be different from that of micro-scale acoustic resonators. This effect, which is visible in all different experimented suspensions, indicates that macro-scale multi-wavelength acoustic resonators inherently show more dampening effects than micro-scale acoustic resonators.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
Setayeshgar, A.; Lipsett, M. G.; Koch, C. R. & Nobes, D. S. Measurement of particle dynamics in a coherent acoustic field, International Symposium on Particle Image Velocimetry – PIV13, July 1-3, 2013, The Netherlands.Setayeshgar, A.; Lipsett, M. G.; Koch, C. R. & Nobes, D. S. Separation of particles in a multi-wavelength macro-channel using an ultrasonic acoustic standing wave, USWNET conference, September 21-22, 2012, Sweden.Setayeshgar, A.; Lipsett, M. G.; Koch, C. R. & Nobes, D. S. Investigating the Particles Motion in Ultrasonic Acoustic Wave Field Using PIV/PTV, International Congress on Ultrasonics, September 5–8, 2011, PolandSetayeshgar, A.; Lipsett, M. G.; Koch, C. R. & Nobes, D. S. Particle motion in a macro-scale multi-wavelength acoustic field, ASME Journal of Fluid Engineering, JFE-14-1010, 2014

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