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Scaling-up ultrasound standing wave enhanced sedimentation filters
Prest, Jeff E. Treves Brown, Bernard J. Fielden, Peter R. Wilkinson, Stephen J. Hawkes, Jeremy J.
Prest, Jeff E.
Treves Brown, Bernard J.
Fielden, Peter R.
Wilkinson, Stephen J.
Hawkes, Jeremy J.
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EPub Date
Publication Date
2014-08-21
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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.
Citation
Scaling-up ultrasound standing wave enhanced sedimentation filters. Ultrasonics, 2015, 56, pp. 260-70
Publisher
Elsevier
Journal
Ultrasonics
Research Unit
DOI
10.1016/j.ultras.2014.08.003
PubMed ID
25193111
PubMed Central ID
Type
Article
Language
en
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This article is not available through ChesterRep.
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ISSN
0041-624X