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Measurement and analysis of flow of concentrated fiber suspensions through a 2-D sudden expansion using UVP
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden.
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.ORCID iD: 0000-0002-7856-2324
Metso Paper Sundsvall AB, Sweden.
2013 (English)In: AIChE Journal, ISSN 0001-1541, E-ISSN 1547-5905, Vol. 59, no 3, p. 1012-1021Article in journal (Refereed) Published
Abstract [en]

The ultrasound velocity profiling technique (UVP) was used to study flow structures after a two-dimensional (2-D) 1:11 sudden expansion of pulp fiber suspensions at varied average velocities (1-2.2 m/s) and concentrations (1.8 and 2.8 wt %). One advantage of studying jet geometry is the potential to investigate the main flow structures away from walls. Measurements done at the same percent of the total jet length, at constant concentration, show that an increase in flow rate gave a faster decrease in centerline velocity and a quicker increase in jet width. Increasing the concentration, at the same jet length, the centerline velocity was more stable and the width of the mixing layer increased more rapidly. Comparisons with CFD simulations in the laminar regime, using the Bingham plastic model, show that the main flow structures were captured if the yield stress used in the simulations is approximately 20% of the measured using a rheometer.

Place, publisher, year, edition, pages
2013. Vol. 59, no 3, p. 1012-1021
Keywords [en]
Food Engineering
Keywords [sv]
Livsmedelsteknik
National Category
Food Science
Identifiers
URN: urn:nbn:se:ri:diva-8328DOI: 10.1002/aic.13881Scopus ID: 2-s2.0-84874550728OAI: oai:DiVA.org:ri-8328DiVA, id: diva2:966199
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2020-12-01Bibliographically approved

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Wiklund, Johan

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