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Comparison of Cavitation Effect in Case of Fixed and Free Fibers in an Ultrasound Beaker
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)ORCID iD: 0000-0003-2955-2776
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. 8217-8224Conference paper, Published paper (Other academic)
Abstract [en]

In this study, we investigate the impact of high-intensity ultrasound treatment on the mechanical properties of pulp fibers. The pulp fiber samples are sonicated in an acoustically optimised beaker where high-intensity ultrasound is generated using a tuned sonotrode device. The idea is to create a controlled resonance to efficiently enhance the sound pressure in the beaker. Input power is 90Watt. The objective is to define the difference between freely suspended fibers in a beaker compared to keeping fibers in a fixed position. The hypothesis is that fiber treatment at a specific input power will be more efficient in the case when fibers are kept in a high pressure zone. Since the fiber wall is a layered structure, it is likely to delaminate internally which will affect the mechanical properties of the fiber. The effect on fiber properties is verified by measuring the ultrasound attenuation spectra for the treated fibers. The attenuation measurements are based on measurements of a low-intensity ultrasound pulse-echo technique. On a macroscopic scale, changes in the attenuation spectra relates to a change in mechanical properties of the fiber wall, since the suspended fibers more or less retain their diameter and length distributions.

Place, publisher, year, edition, pages
Aachen, Germany, 2019. p. 8217-8224
Keywords [en]
Ultrasonics, Cavitation, Paper pulp, Cellulose fibers
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Acoustics
Identifiers
URN: urn:nbn:se:ltu:diva-76050ISBN: 978-3-939296-15-7 (electronic)OAI: oai:DiVA.org:ltu-76050DiVA, id: diva2:1352350
Conference
23rd International Congress on Acoustics
Funder
Swedish Energy AgencyAvailable from: 2019-09-18 Created: 2019-09-18 Last updated: 2019-10-22

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http://pub.dega-akustik.de/ICA2019/data/articles/000789.pdf

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Pamidi, Taraka Rama KrishnaJohansson, ÖrjanLöfqvist, Torbjörn
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