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Prediction of gas-solid flows in a square duct with a 90° bend

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.350
12 pages

Derrick O. Njobuenwu
School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK

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

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

要約

The numerical prediction of turbulent gas-solid flows in square ducts with a 90° bend is undertaken using an Eulerian-Lagrangian approach. Solution of the Reynolds-averaged Navier-Stokes equations was carried out using a second-moment turbulence closure, with solutions coupled to a Lagrangian particle tracking routine used to model solid particle trajectories. The latter algorithm contained particle-wall collision and wall roughness models, with the Eulerian and Lagrangian approaches coupled under the assumption of one-way coupling using a stochastic approach based on a random Fourier series method. Predictions of the complete model are compared with data obtained in flows within horizontal-to-vertical and vertical-to-horizontal ducts with a 90° bend. The behaviour of the gas phase is demonstrated to be characterised by the pressure distribution across the duct, while particle dispersion and roping phenomena are observed. The predicted mean and fluctuating velocities for the solid phase are found to compare well with the experimental data.

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