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Mechanisms of inertial particle re-suspension in a turbulent square duct flow

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.360
12 pages

Jun Yao
Institute of Particle Science and Engineering, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK

Michael Fairweather
School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK

要約

Particle re-suspension in a turbulent square duct flow is studied using large eddy simulation combined with Lagrangian particle tracking under conditions of one-way coupling, with the particle equation of motion solved with Stokes drag, lift, buoyancy and gravitational force terms. Here, re-suspension is taken to mean the movement of particles in close proximity to the duct floor back in to the mainstream of the flow. The flow considered has a bulk Re = 250 k, with four particle sizes ranging from 5 to 500 μm examined. The results demonstrate that turbulence-driven secondary flows within the duct play an important role in the re-suspension process, with re-suspension promoted by the drag force arising from the secondary flows which is balanced by the gravitational force, with this effect increasing with decreasing particle size. The drag force is found to dominate small particle re-suspension, while for large particles the lift force is also a contributing factor.

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