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PARTICLE-LEVEL SIMULATIONS OF FLOCCULATION IN A FIBER SUSPENSION FLOWING THROUGH A DIFFUSER
Chalmers University of Technology, Sweden.
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Mekanik och hållfasthetslära. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0002-1503-8293
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden.
2017 (engelsk)Inngår i: Thermal Science, ISSN 0354-9836, E-ISSN 2334-7163, Vol. 21, s. S573-S583Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We investigate flocculation in dilute suspensions of rigid, straight fibers in a decelerating flow field of a diffuser. We carry out numerical studies using a particle-level simulation technique that takes into account the fiber inertia and the non-creeping fiber-flow interactions. The fluid flow is governed by the Reynolds averaged Navier-Stokes equations with the standard k-omega eddy-viscosity turbulence model. A one-way coupling between the fibers and the flow is considered with a stochastic model for the fiber dispersion due to turbulence. The fibers interact through short-range attractive forces that cause them to aggregate into flocs when fiber-fiber collisions occur. We show that ballistic deflection of fibers greatly increases the flocculation in the diffilser. The inlet fiber kinematics and the fiber inertia are the main parameters that affect fiber flocculation in the predffuser region.

sted, utgiver, år, opplag, sider
VINCA INST NUCLEAR SCI , 2017. Vol. 21, s. S573-S583
Emneord [en]
fiber suspension; ballistic deflection; decelerating flow; flocculation; diffuser
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-144278DOI: 10.2298/TSCI160510185AISI: 000418781900005OAI: oai:DiVA.org:liu-144278DiVA, id: diva2:1173458
Konferanse
Turbulence Workshop
Tilgjengelig fra: 2018-01-12 Laget: 2018-01-12 Sist oppdatert: 2018-02-12

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