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Acoustic design principles for energy efficient excitation of a high intensity cavitation zone
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics. (Engineering Acoustics)ORCID iD: 0000-0003-2955-2776
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics. (Engineering Acoustics)ORCID iD: 0000-0002-4657-6844
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics. (Engineering Acoustics)
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
2019 (English)In: Proceedings of the 23rd International Congress on Acoustics, integrating 4th EAA Euroregio 2019: ICA 2019, 9 - 13 September / [ed] Martin Ochmann, Aachen, Germany, 2019, p. 948-955Conference paper, Published paper (Other academic)
Abstract [en]

Energy-efficient process intensification is a key aspect for a sustainable industrial production. To improve energy conversion efficiency high intensity cavitation is a promising method, especially in cases where the material to be treated is valuable and on the micro meter scale. Transient collapsing cavitation bubbles gives powerful effects on objects immersed in fluids, like cellulose fibers, mineral particles, enzymes, etc. The cavitation process needs optimization and control, since optimal conditions is multivariate challenge. This study focuses on different design principles to achieve high intensity cavitation in a specific volume in a continuous flow. This study explores some potential design principles to obtain energy efficient process intensification. The objective is to tune several different resonance phenomena to create a powerful excitation of a flowing suspension (two-phase flow and cavitation bubbles). The reactor is excited by sonotrodes, connected to two coupled resonant tube structures, at the critical frequency. Finally cavitation bubbles are initiated by a flow through a venturi nozzle. The acoustically optimised reactor geometry is modelled in Comsol Multiphysics®, and excited by dedicated ultrasound signals at three different frequencies. The effect of the high intensity cavitation is experimentally evaluated by calorimetric method, foil tests and degree of fibrillation on cellulose fibers.

Place, publisher, year, edition, pages
Aachen, Germany, 2019. p. 948-955
Keywords [en]
Structural acoustics, Ultrasound, Hydrodynamics, Cavitation
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Acoustics
Identifiers
URN: urn:nbn:se:ltu:diva-76063ISBN: 978-3-939296-15-7 (electronic)OAI: oai:DiVA.org:ltu-76063DiVA, id: diva2:1352669
Conference
23rd International Congress on Acoustics
Funder
Swedish Energy AgencyAvailable from: 2019-09-19 Created: 2019-09-19 Last updated: 2019-09-19

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Other links

http://pub.dega-akustik.de/ICA2019/data/articles/000794.pdf

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Johansson, ÖrjanPamidi, Taraka Rama KrishnaLöfqvist, Torbjörn

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