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IUTAM Symposium on Computational Approaches to Multiphase FlowSimulation of Particle Diffusion, Segregation, and Intermittency in Turbulent Flows

IUTAM Symposium on Computational Approaches to Multiphase Flow: Simulation of Particle Diffusion,... Simulation of Particle Diffusion, Segregation, and Intermittency in Turbulent Flows Michael W. Reeks School of Mechanical & Systems Engineering, The University of Newcastle upon Tyne, UK; e-mail: mike.reeks@ncl.ac.uk Key words: particles, turbulent structures, segregation, kinematic simulation 1 Introduction It is by now well known that turbulence, contrary to traditionally held views, can demix a suspension of particles, segregating the particles into regions of high strain rate. The process depends upon the ratio of the particle response time to the timescale of the turbulent structures in the flow (i.e. the Stokes number), the maximum segreg- ation occurring when this ratio ∼1. There have been numerous simulations and PIV based measurements that have demonstrated this phenomenon in various types of flows from simple homogeneous turbulent flow to turbulent boundary layers [1]. In this regard, there have been four major areas of study where segregation and de- mixing have played a vital role: (a) the deposition of particles in turbulent boundary layers [2]; (b) droplet/particle coalescence in clouds which controls droplet size and distribution and eventual rain fall [3]; (c) particle agglomeration in turbulent bound- ary layers which leads to the formation of ropes; (d) two-way coupling between the dispersed and continuous http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

IUTAM Symposium on Computational Approaches to Multiphase FlowSimulation of Particle Diffusion, Segregation, and Intermittency in Turbulent Flows

Part of the Fluid Mechanics and Its Applications Book Series (volume 81)
Editors: Balachandar, S.; Prosperetti, A.
Reeks, Michael W.
IUTAM Symposium on Computational Approaches to Multiphase Flow — Jan 1, 2006
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Publisher
Springer Netherlands
Copyright
© Springer 2006
ISBN
978-1-4020-4976-7
Pages
21 –30
DOI
10.1007/1-4020-4977-3_3
Publisher site
See Chapter on Publisher Site

Abstract

Simulation of Particle Diffusion, Segregation, and Intermittency in Turbulent Flows Michael W. Reeks School of Mechanical & Systems Engineering, The University of Newcastle upon Tyne, UK; e-mail: mike.reeks@ncl.ac.uk Key words: particles, turbulent structures, segregation, kinematic simulation 1 Introduction It is by now well known that turbulence, contrary to traditionally held views, can demix a suspension of particles, segregating the particles into regions of high strain rate. The process depends upon the ratio of the particle response time to the timescale of the turbulent structures in the flow (i.e. the Stokes number), the maximum segreg- ation occurring when this ratio ∼1. There have been numerous simulations and PIV based measurements that have demonstrated this phenomenon in various types of flows from simple homogeneous turbulent flow to turbulent boundary layers [1]. In this regard, there have been four major areas of study where segregation and de- mixing have played a vital role: (a) the deposition of particles in turbulent boundary layers [2]; (b) droplet/particle coalescence in clouds which controls droplet size and distribution and eventual rain fall [3]; (c) particle agglomeration in turbulent bound- ary layers which leads to the formation of ropes; (d) two-way coupling between the dispersed and continuous

Published: Jan 1, 2006

Keywords: particle; turbulent structures; segregation; kinematic simulation

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