Modeling stratified segregation in periodically driven granular heap flow
Xiao H, Deng Z, Ottino JM, Umbanhowar PB, Lueptow RM (2023)
Publication Type: Journal article
Publication year: 2023
Journal
Book Volume: 278
Article Number: 118870
DOI: 10.1016/j.ces.2023.118870
Abstract
We present a continuum approach to model segregation of size-bidisperse granular materials in unsteady bounded heap flow as a prototype for modeling segregation in other time varying flows. In experiments, a periodically modulated feed rate produces stratified segregation like that which occurs due to intermittent avalanching, except with greater layer-uniformity and higher average feed rates. Using an advection-diffusion-segregation equation and characterizing transient changes in deposition and erosion after a feed rate change, we model stratification for varying feed rates and periods. Feed rate modulation in heap flows can create well-segregated layers, which effectively mix the deposited material normal to the free surface at lengths greater than the combined layer-thickness. This mitigates the strong streamwise segregation that would otherwise occur at larger particle-size ratios and equivalent steady feed rates and can significantly reduce concentration variation during hopper discharge. Coupling segregation, deposition and erosion is challenging but has many potential applications.
Involved external institutions
United States (USA) (US)How to cite
APA:
Xiao, H., Deng, Z., Ottino, J.M., Umbanhowar, P.B., & Lueptow, R.M. (2023). Modeling stratified segregation in periodically driven granular heap flow. Chemical Engineering Science, 278. https://dx.doi.org/10.1016/j.ces.2023.118870
MLA:
Xiao, Hongyi, et al. "Modeling stratified segregation in periodically driven granular heap flow." Chemical Engineering Science 278 (2023).
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