Controlling granular segregation using modulated flow

Hongyi Xiao; David McDonald; Yi Fan; Paul B. Umbanhowar; Julio M. Ottino; Richard M. Lueptow

doi:10.1016/j.powtec.2017.02.050

Controlling granular segregation using modulated flow

Hongyi Xiao, David McDonald, Yi Fan, Paul B. Umbanhowar, Julio M. Ottino, Richard M. Lueptow^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

Unsteady flows of granular media are ubiquitous yet remain largely unexplored. In this research, we apply unsteady flows to strongly segregating granular materials to control the segregation pattern and enhance overall mixing. Size-bidisperse granular mixtures with large size ratios flowing onto a quasi-2D bounded heap form stratified layers of large and small particles when the flow rate is modulated. These layers exhibit better average mixing than the segregated patterns generated by steady feed rates. The mechanisms of layer formation under modulated flow differ from those for spontaneous stratification and are related to changes in the composition of the flowing layer at different stages in each feed cycle. The thickness and length of the stratified layers can be controlled by changing the feed rates and feed cycle durations, which is potentially useful for reducing segregation in industrial processes.

Original language	English (US)
Pages (from-to)	360-368
Number of pages	9
Journal	Powder Technology
Volume	312
DOIs	https://doi.org/10.1016/j.powtec.2017.02.050
State	Published - May 1 2017

Keywords

Flow modulation
Mixing and segregation
Stratification
Unsteady flows

ASJC Scopus subject areas

General Chemical Engineering

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10.1016/j.powtec.2017.02.050

Cite this

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title = "Controlling granular segregation using modulated flow",

abstract = "Unsteady flows of granular media are ubiquitous yet remain largely unexplored. In this research, we apply unsteady flows to strongly segregating granular materials to control the segregation pattern and enhance overall mixing. Size-bidisperse granular mixtures with large size ratios flowing onto a quasi-2D bounded heap form stratified layers of large and small particles when the flow rate is modulated. These layers exhibit better average mixing than the segregated patterns generated by steady feed rates. The mechanisms of layer formation under modulated flow differ from those for spontaneous stratification and are related to changes in the composition of the flowing layer at different stages in each feed cycle. The thickness and length of the stratified layers can be controlled by changing the feed rates and feed cycle durations, which is potentially useful for reducing segregation in industrial processes.",

keywords = "Flow modulation, Mixing and segregation, Stratification, Unsteady flows",

author = "Hongyi Xiao and David McDonald and Yi Fan and Umbanhowar, {Paul B.} and Ottino, {Julio M.} and Lueptow, {Richard M.}",

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T1 - Controlling granular segregation using modulated flow

AU - Xiao, Hongyi

AU - McDonald, David

AU - Fan, Yi

AU - Umbanhowar, Paul B.

AU - Ottino, Julio M.

AU - Lueptow, Richard M.

PY - 2017/5/1

Y1 - 2017/5/1

N2 - Unsteady flows of granular media are ubiquitous yet remain largely unexplored. In this research, we apply unsteady flows to strongly segregating granular materials to control the segregation pattern and enhance overall mixing. Size-bidisperse granular mixtures with large size ratios flowing onto a quasi-2D bounded heap form stratified layers of large and small particles when the flow rate is modulated. These layers exhibit better average mixing than the segregated patterns generated by steady feed rates. The mechanisms of layer formation under modulated flow differ from those for spontaneous stratification and are related to changes in the composition of the flowing layer at different stages in each feed cycle. The thickness and length of the stratified layers can be controlled by changing the feed rates and feed cycle durations, which is potentially useful for reducing segregation in industrial processes.

AB - Unsteady flows of granular media are ubiquitous yet remain largely unexplored. In this research, we apply unsteady flows to strongly segregating granular materials to control the segregation pattern and enhance overall mixing. Size-bidisperse granular mixtures with large size ratios flowing onto a quasi-2D bounded heap form stratified layers of large and small particles when the flow rate is modulated. These layers exhibit better average mixing than the segregated patterns generated by steady feed rates. The mechanisms of layer formation under modulated flow differ from those for spontaneous stratification and are related to changes in the composition of the flowing layer at different stages in each feed cycle. The thickness and length of the stratified layers can be controlled by changing the feed rates and feed cycle durations, which is potentially useful for reducing segregation in industrial processes.

KW - Flow modulation

KW - Mixing and segregation

KW - Stratification

KW - Unsteady flows

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Controlling granular segregation using modulated flow

Abstract

Keywords

ASJC Scopus subject areas

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