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Influence of shape on particle behaviour in channel flow

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.800
pages 729-740

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


Particle dynamics in a channel flow are investigated using large eddy simulation and a Lagrangian particle tracking technique. Following validation of single-phase flow predictions against DNS, fluid velocities are subsequently used to study the behaviour of particles of differing shape assuming one-way coupling. The influence of shape- and orientation-dependent drag and lift forces on both the translational and rotational motion of the particles is accounted for to ensure accurate representation of the flow dynamics of non-spherical particles. The size of the particles studied was obtained based on an equivalent-volume sphere, and differing shapes were modelled using super-quadratic ellipsoid forms by varying their aspect ratio, with their orientation predicted using the incidence angle between the particle relative velocity and the particle principal axis. Results are presented for spherical, needle- and platelet-like particles at a number of different boundary layer locations along the wall-normal direction within the channel. The time evolution and probability density functions of selected particle translational and rotational properties show a clear distinction between the particles' behaviour, and indicate the significance of particle shape when modelling many practically relevant flows.

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