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Turbulent channel flow of a dense binary mixture of rigid particles

Published online by Cambridge University Press:  05 April 2017

Iman Lashgari Open the ORCID record for Iman Lashgari [Opens in a new window] ,
Francesco Picano ,
Pedro Costa ,
Wim-Paul Breugem  and
Luca Brandt
Iman Lashgari*
Affiliation:
Linné FLOW Centre and SeRC (Swedish e-Science Research Centre), KTH Mechanics, SE-100 44 Stockholm, Sweden
Francesco Picano
Affiliation:
Department of Industrial Engineering, University of Padova, Padova, Italy
Pedro Costa
Affiliation:
Laboratory for Aero and Hydrodynamics, Delft University of Technology, Delft, The Netherlands
Wim-Paul Breugem
Affiliation:
Laboratory for Aero and Hydrodynamics, Delft University of Technology, Delft, The Netherlands
Luca Brandt
Affiliation:
Linné FLOW Centre and SeRC (Swedish e-Science Research Centre), KTH Mechanics, SE-100 44 Stockholm, Sweden
*
†Email address for correspondence: imanl@mech.kth.se
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Abstract

We study turbulent channel flow of a binary mixture of finite-sized neutrally buoyant rigid particles by means of interface-resolved direct numerical simulations. We fix the bulk Reynolds number and total solid volume fraction, $Re_{b}=5600$ and $\unicode[STIX]{x1D6F7}=20\,\%$, and vary the relative fraction of small and large particles. The binary mixture consists of particles of two different sizes, $2h/d_{l}=20$ and $2h/d_{s}=30$ where $h$ is the half-channel height and $d_{l}$ and $d_{s}$ the diameters of the large and small particles. While the particulate flow statistics exhibit a significant alteration of the mean velocity profile and turbulent fluctuations with respect to the unladen flow, the differences between the mono-disperse and bi-disperse cases are small. However, we observe a clear segregation of small particles at the wall in binary mixtures, which affects the dynamics of the near-wall region and thus the overall drag. This results in a higher drag in suspensions with a larger number of large particles. As regards bi-disperse effects on the particle dynamics, a non-monotonic variation of the particle dispersion in the spanwise (homogeneous) direction is observed when increasing the percentage of small/large particles. Finally, we note that particles of the same size tend to cluster more at contact whereas the dynamics of the large particles gives the highest collision kernels due to a higher approaching speed.

JFM classification

Multiphase and Particle-laden Flows: Multiphase and Particle-laden Flows Turbulent Flows: Turbulent Flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 818 , 10 May 2017 , pp. 623 - 645
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© 2017 Cambridge University Press 

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