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Turbulent stress measurements of fibre suspensions in a straight pipe
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation. KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0002-6394-6990
KTH Royal Institute of Technology, Sweden.
2018 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 30, no 2, article id 025104Article in journal (Refereed) Published
Abstract [en]

The focus of the present work is an experimental study of the behaviour of semi-dilute, opaque fibre suspensions in fully developed cylindrical pipe flows. Measurements of the normal and turbulent shear stress components and the mean flow were acquired using phase-contrast magnetic resonance velocimetry. Two fibre types, namely, pulp fibre and nylon fibre, were considered in this work and are known to differ in elastic modulus. In total, three different mass concentrations and seven Reynolds numbers were tested to investigate the effects of fibre interactions during the transition from the plug flow to fully turbulent flow. It was found that in fully turbulent flows of nylon fibres, the normal, uzuz+, and shear, uzur+ (note that · is the temporal average, u is the fluctuating velocity, z is the axial or streamwise component, and r is the radial direction), turbulent stresses increased with Reynolds number regardless of the crowding number (a concentration measure). For pulp fibre, the turbulent stresses increased with Reynolds number when a fibre plug was present in the flow and were spatially similar in magnitude when no fibre plug was present. Pressure spectra revealed that the stiff, nylon fibre reduced the energy in the inertial-subrange with an increasing Reynolds and crowding number, whereas the less stiff pulp fibre effectively cuts the energy cascade prematurely when the network was fully dispersed.

Place, publisher, year, edition, pages
2018. Vol. 30, no 2, article id 025104
Keyword [en]
Magnetic resonance, Pipe flow, Polyamides, Rayon, Reynolds number, Shear flow, Shear stress, Turbulent flow, Concentration measures, Cylindrical pipes, Fibre interactions, Fluctuating velocities, Inertial subrange, Phase-contrast magnetic resonances, Pressure spectrum, Turbulent shear stress, Fibers
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-33444DOI: 10.1063/1.5008395Scopus ID: 2-s2.0-85042207370OAI: oai:DiVA.org:ri-33444DiVA, id: diva2:1189358
Available from: 2018-03-09 Created: 2018-03-09 Last updated: 2018-03-16Bibliographically approved

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Swerin, Agne

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