Measuring segregation characteristics of industrially relevant granular mixtures: Part I -- A continuum model approach

Abstract

We present a method to estimate the segregation parameter, $S,$ a key input in a continuum transport model of particulate flows. $S$ is determined by minimizing the difference between measured and model-predicted concentration profiles. To validate the approach, we conduct discrete element method simulations of size-bidisperse mixtures in quasi-2D bounded heap flow; the resulting data show that $S$ calculated from concentration profiles is consistent with the directly measured value. The method's accuracy depends critically on the velocity profile during filling, but only weakly on the diffusion coefficient. When the velocity profile is nominally spanwise invariant, the error between estimated and measured $S$ is $10\%$. This method is intended for practical application (described in Part II), so we restrict characterization of the velocity profile to that which can be readily determined experimentally, and explore the sensitivity of concentration profiles to variation of the gap between the sidewalls of the heap.

arXiv comment13 pages, 11 figures. Correctly formatted version of article published in Powder Technology

References in corpus (7)

• On dense granular flows
• Crucial role of side walls for granular surface flows: consequences for the rheology
• Creep motion in a granular pile exhibiting steady surface flow
• Self-diffusion in dense granular shear flows
• Modeling size segregation of granular materials: the roles of segregation, advection and diffusion
• Stratification, segregation and mixing of granular materials in quasi-2D bounded heaps
• Asymmetric concentration dependence of segregation fluxes in granular flows

Cited by in corpus (1)

• Granular segregation across flow geometries: a closure model for the particle segregation velocity