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Turbulent stress measurements of fibre suspensions in a straight pipe
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Centra, Wallenberg Wood Science Center.ORCID-id: 0000-0003-3737-0091
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemi, Yt- och korrosionsvetenskap. RISE Research Institutes of Sweden.
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Centra, Wallenberg Wood Science Center.ORCID-id: 0000-0002-2504-3969
2018 (Engelska)Ingår i: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 30, nr 2, artikel-id 025104Artikel i tidskrift (Refereegranskat) 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, < u(z)u(z)>(+), and shear, < u(z)u(z)>(+) (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.

Ort, förlag, år, upplaga, sidor
American Institute of Physics (AIP), 2018. Vol. 30, nr 2, artikel-id 025104
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:kth:diva-224706DOI: 10.1063/1.5008395ISI: 000426584400034Scopus ID: 2-s2.0-85042207370OAI: oai:DiVA.org:kth-224706DiVA, id: diva2:1192342
Forskningsfinansiär
Energimyndigheten
Anmärkning

QC 20180322

Tillgänglig från: 2018-03-22 Skapad: 2018-03-22 Senast uppdaterad: 2018-03-22Bibliografiskt granskad

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MacKenzie, JordanSöderberg, DanielLundell, Fredrik

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MacKenzie, JordanSöderberg, DanielSwerin, AgneLundell, Fredrik
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MekanikLinné Flow Center, FLOWWallenberg Wood Science CenterYt- och korrosionsvetenskap
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Physics of fluids
Strömningsmekanik och akustik

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