Scaling-up ultrasound standing wave enhanced sedimentation filters

Hdl Handle:
http://hdl.handle.net/10034/552290
Title:
Scaling-up ultrasound standing wave enhanced sedimentation filters
Authors:
Prest, Jeff E.; Treves Brown, Bernard J.; Fielden, Peter R.; Wilkinson, Stephen J.; Hawkes, Jeremy J.
Abstract:
Particle concentration and filtration is a key stage in a wide range of processing industries and also one that can be present challenges for high throughput, continuous operation. Here we demonstrate some features which increase the efficiency of ultrasound enhanced sedimentation and could enable the technology the potential to be scaled up. In this work, 20 mm piezoelectric plates were used to drive 100 mm high chambers formed from single structural elements. The coherent structural resonances were able to drive particles (yeast cells) in the water to nodes throughout the chamber. Ultrasound enhanced sedimentation was used to demonstrate the efficiency of the system (>99% particle clearance). Sub-wavelength pin protrusions were used for the contacts between the resonant chamber and other elements. The pins provided support and transferred power, replacing glue which is inefficient for power transfer. Filtration energies of ∼4 J/ml of suspension were measured. A calculation of thermal convection indicates that the circulation could disrupt cell alignment in ducts >35 mm high when a 1K temperature gradient is present; we predict higher efficiencies when this maximum height is observed. For the acoustic design, although modelling was minimal before construction, the very simple construction allowed us to form 3D models of the nodal patterns in the fluid and the duct structure. The models were compared with visual observations of particle movement, Chladni figures and scanning laser vibrometer mapping. This demonstrates that nodal planes in the fluid can be controlled by the position of clamping points and that the contacts could be positioned to increase the efficiency and reliability of particle manipulations in standing waves.
Affiliation:
Lancaster University ; University of Manchester ; Lancaster University ; University of Chester ; University of Manchester
Citation:
Scaling-up ultrasound standing wave enhanced sedimentation filters. Ultrasonics, 2015, 56, pp. 260-70
Publisher:
Elsevier
Journal:
Ultrasonics
Publication Date:
21-Aug-2014
URI:
http://hdl.handle.net/10034/552290
DOI:
10.1016/j.ultras.2014.08.003
PubMed ID:
25193111
Additional Links:
http://www.journals.elsevier.com/ultrasonics/; http://www.sciencedirect.com/science/article/pii/S0041624X1400225X
Type:
Article
Language:
en
Description:
This article is not available through ChesterRep.
ISSN:
1874-9968
Appears in Collections:
Chemical Engineering

Full metadata record

DC FieldValue Language
dc.contributor.authorPrest, Jeff E.en
dc.contributor.authorTreves Brown, Bernard J.en
dc.contributor.authorFielden, Peter R.en
dc.contributor.authorWilkinson, Stephen J.en
dc.contributor.authorHawkes, Jeremy J.en
dc.date.accessioned2015-05-05T10:42:55Zen
dc.date.available2015-05-05T10:42:55Zen
dc.date.issued2014-08-21en
dc.identifier.citationScaling-up ultrasound standing wave enhanced sedimentation filters. Ultrasonics, 2015, 56, pp. 260-70en
dc.identifier.issn1874-9968en
dc.identifier.pmid25193111en
dc.identifier.doi10.1016/j.ultras.2014.08.003en
dc.identifier.urihttp://hdl.handle.net/10034/552290en
dc.descriptionThis article is not available through ChesterRep.en
dc.description.abstractParticle concentration and filtration is a key stage in a wide range of processing industries and also one that can be present challenges for high throughput, continuous operation. Here we demonstrate some features which increase the efficiency of ultrasound enhanced sedimentation and could enable the technology the potential to be scaled up. In this work, 20 mm piezoelectric plates were used to drive 100 mm high chambers formed from single structural elements. The coherent structural resonances were able to drive particles (yeast cells) in the water to nodes throughout the chamber. Ultrasound enhanced sedimentation was used to demonstrate the efficiency of the system (>99% particle clearance). Sub-wavelength pin protrusions were used for the contacts between the resonant chamber and other elements. The pins provided support and transferred power, replacing glue which is inefficient for power transfer. Filtration energies of ∼4 J/ml of suspension were measured. A calculation of thermal convection indicates that the circulation could disrupt cell alignment in ducts >35 mm high when a 1K temperature gradient is present; we predict higher efficiencies when this maximum height is observed. For the acoustic design, although modelling was minimal before construction, the very simple construction allowed us to form 3D models of the nodal patterns in the fluid and the duct structure. The models were compared with visual observations of particle movement, Chladni figures and scanning laser vibrometer mapping. This demonstrates that nodal planes in the fluid can be controlled by the position of clamping points and that the contacts could be positioned to increase the efficiency and reliability of particle manipulations in standing waves.en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.urlhttp://www.journals.elsevier.com/ultrasonics/en
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0041624X1400225Xen
dc.rightsArchived with thanks to Ultrasonicsen
dc.subjectfiltrationen
dc.subjectresonant chambersen
dc.subjectacoustic radiation forceen
dc.subjectacoustofluidicen
dc.subjectscale-upen
dc.subject.meshAcousticsen
dc.subject.meshFiltrationen
dc.subject.meshHot Temperatureen
dc.subject.meshModels, Biologicalen
dc.subject.meshTemperatureen
dc.subject.meshUltrasonicsen
dc.subject.meshVibrationen
dc.subject.meshYeastsen
dc.titleScaling-up ultrasound standing wave enhanced sedimentation filtersen
dc.typeArticleen
dc.contributor.departmentLancaster University ; University of Manchester ; Lancaster University ; University of Chester ; University of Manchesteren
dc.identifier.journalUltrasonicsen

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