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Particle force-based density segregation theory for multi-component granular mixtures in a periodic chute flow

Published online by Cambridge University Press:  30 January 2023

Vishnu Kumar Sahu Open the ORCID record for Vishnu Kumar Sahu [Opens in a new window] ,
Soniya Kumawat Open the ORCID record for Soniya Kumawat [Opens in a new window] ,
Shivani Agrawal  and
Anurag Tripathi Open the ORCID record for Anurag Tripathi [Opens in a new window]
Vishnu Kumar Sahu
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Kanpur, 208016, India
Soniya Kumawat
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Kanpur, 208016, India
Shivani Agrawal
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Kanpur, 208016, India
Anurag Tripathi*
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Kanpur, 208016, India
*
†Email address for correspondence: anuragt@iitk.ac.in
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Abstract

Density segregation of multi-component granular mixtures in a dense, gravity-driven flow over a rough and bumpy periodic chute surface is studied using theory and simulations. An existing theoretical model for predicting the steady-state concentration field of each species in a binary mixture using the forces acting on the particles is generalised for multi-component mixtures in this work. In addition, the rheological model for binary mixtures is also extended to multi-component mixtures. In contrast to the percolation velocity-based empirical segregation models that do not account for the rheology and need prior knowledge of the velocity field, the present approach accounts for the inter-coupling of rheology with segregation. The momentum balance equations are solved, along with the mixture rheological model as well as the multi-component density segregation model, to obtain concentration fields using an iterative numerical method. The theoretical predictions are compared with discrete element method (DEM) simulations for ternary, quaternary and quinary granular mixtures differing in density. The steady-state profiles for the concentration of different species as well as other flow properties predicted from the theory are in excellent agreement with the DEM simulation results for a variety of compositions over a range of inclination angles for different density ratios. Through this work, we take the first essential step towards proposing a generalised particle force-based segregation theory for multi-component mixtures differing in size and/or density.

JFM classification

Granular media: Dry granular material
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 956 , 10 February 2023 , A8
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Copyright
© The Author(s), 2023. Published by Cambridge University Press

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References

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