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Transient segregation of different density granular mixtures

Published online by Cambridge University Press:  14 April 2025

Soniya Kumawat Open the ORCID record for Soniya Kumawat [Opens in a new window] ,
Vishnu Kumar Sahu Open the ORCID record for Vishnu Kumar Sahu [Opens in a new window]  and
Anurag Tripathi Open the ORCID record for Anurag Tripathi [Opens in a new window]
Soniya Kumawat
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
Vishnu Kumar Sahu
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
Anurag Tripathi*
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
*
Corresponding author: Anurag Tripathi, [email protected]
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Abstract

We study time-dependent density segregation of granular mixtures flowing over an inclined plane. Discrete element method (DEM) simulations in a periodic box are performed for granular mixtures of same size and different density particles flowing under the influence of gravity. In addition, a continuum model is developed to solve the momentum balance equations along with the species transport equation by accounting for the inter-coupling of segregation and rheology. The particle force-based density segregation theory has been used along with the $\mu {-}I$ rheology to predict evolution of flow properties with time for binary and multicomponent mixtures. The effect of particle arrangements on the transient evolution of flow properties for three different initial configurations is investigated using both continuum and DEM simulations. Continuum predictions for various flow properties of interest such as species concentration, velocity, pressure and shear stress at different time instants are compared with DEM simulations. The results from the discrete and continuum models are found to be in good agreement with each other for well-mixed and heavy-near-base initial configurations. Kinetic theory-based predictions of segregation evolution, however, show good quantitative agreement only for the heavy-near-base configuration with a much slower evolution for the well-mixed case. Interestingly, the continuum model is unable to predict the flow evolution for the light-near-base initial configuration. DEM simulations reveal the presence of an instability driven, quick segregation for this configuration which is not predicted by the one-dimensional model and requires generalisation to three dimensions.

JFM classification

Granular media: Dry granular material
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 1008 , 10 April 2025 , A53
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© The Author(s), 2025. Published by Cambridge University Press

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