Comparison of Cavitation Effect in Case of Fixed and Free Fibers in an Ultrasound Beaker

23rd International Congress on Acoustics,integrating 4th EAA Euroregio 2019

Document identifier: oai:DiVA.org:ltu-76050
Access full text here:10.18154/RWTH-CONV-239445
Keyword: Engineering and Technology, Ultrasonics, Electronic systems, Engineering Acoustics, Teknisk akustik, Cellulose fibers, Paper pulp, Cavitation, Annan elektroteknik och elektronik, Mechanical Engineering, Elektroteknik och elektronik, Other Electrical Engineering, Electronic Engineering, Information Engineering, Electrical Engineering, Electronic Engineering, Information Engineering, Strömningsmekanik och akustik, Maskinteknik, Teknik och teknologier, Fluid Mechanics and Acoustics, Elektroniksystem
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructureSDG 3 Good health and wellbeing
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

This study investigate the impact of high-intensity ultrasound treatment on the mechanical properties of pulp fibers. The pulp fiber samples are sonicated in an acoustically optimized 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 was 90 W. 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.

Authors

Taraka Rama Krishna Pamidi

Luleå tekniska universitet; Drift, underhåll och akustik
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Örjan Johansson

Luleå tekniska universitet; Drift, underhåll och akustik
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Torbjörn Löfqvist

Luleå tekniska universitet; EISLAB
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