Xiao H, Deng Z, Ottino JM, Umbanhowar PB, Lueptow RM (2023)
Publication Type: Journal article
Publication year: 2023
Book Volume: 278
Article Number: 118870
DOI: 10.1016/j.ces.2023.118870
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.
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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