Granular Temperature and Segregation in Dense Sheared Particulate Mixtures
In gravity-driven flows of different-sized (same density) particles, it is well known that larger particles tend to segregate upward (toward the free surface), and the smaller particles downward in the direction of gravity. Alternatively, when the particles are of the same size but different density...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Hosokawa Powder Technology Foundation
2016-02-01
|
| Series: | KONA Powder and Particle Journal |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/kona/33/0/33_2016022/_html/-char/en |
| _version_ | 1818353290657660928 |
|---|---|
| author | Kimberly M. Hill Yi Fan |
| author_facet | Kimberly M. Hill Yi Fan |
| author_sort | Kimberly M. Hill |
| collection | DOAJ |
| description | In gravity-driven flows of different-sized (same density) particles, it is well known that larger particles tend to segregate upward (toward the free surface), and the smaller particles downward in the direction of gravity. Alternatively, when the particles are of the same size but different density, lighter particles tend to segregate upward and heavier particles, downward. When particles differ in both size and density, true of most mixtures of interest in industry and nature, the details are complicated and no rule based on gravity alone has captured the segregation behaviours. Gradients of granular temperature and kinetic stress (i.e., energy and stress associated with velocity fluctuations) offer alternative segregation driving forces, but have, until recently, been discounted as these dynamics are relatively small in dense flows. Recently, gradients in kinetic stress have been shown to play a significant role in segregating densely sheared particle mixtures, even where the kinetic stress is a relatively small percentage of the total stress. We review recent modelling advances accounting for this effect and validation in computational experiments. We show how this framework may be useful in capturing the complicated segregation phenomenology that emerges for dense sheared flows of particles different in both size and density. |
| first_indexed | 2024-12-13T19:07:11Z |
| format | Article |
| id | doaj.art-eb9bff1fc2304fdeaa6ab928653eb20e |
| institution | Directory Open Access Journal |
| issn | 0288-4534 2187-5537 |
| language | English |
| last_indexed | 2024-12-13T19:07:11Z |
| publishDate | 2016-02-01 |
| publisher | Hosokawa Powder Technology Foundation |
| record_format | Article |
| series | KONA Powder and Particle Journal |
| spelling | doaj.art-eb9bff1fc2304fdeaa6ab928653eb20e2022-12-21T23:34:31ZengHosokawa Powder Technology FoundationKONA Powder and Particle Journal0288-45342187-55372016-02-0133015016810.14356/kona.2016022konaGranular Temperature and Segregation in Dense Sheared Particulate MixturesKimberly M. Hill0Yi Fan1St. Anthony Falls Laboratory and the Department of Civil, Environmental, and Geo-Engineering, University of Minnesota, USAThe Dow Chemical Company, USAIn gravity-driven flows of different-sized (same density) particles, it is well known that larger particles tend to segregate upward (toward the free surface), and the smaller particles downward in the direction of gravity. Alternatively, when the particles are of the same size but different density, lighter particles tend to segregate upward and heavier particles, downward. When particles differ in both size and density, true of most mixtures of interest in industry and nature, the details are complicated and no rule based on gravity alone has captured the segregation behaviours. Gradients of granular temperature and kinetic stress (i.e., energy and stress associated with velocity fluctuations) offer alternative segregation driving forces, but have, until recently, been discounted as these dynamics are relatively small in dense flows. Recently, gradients in kinetic stress have been shown to play a significant role in segregating densely sheared particle mixtures, even where the kinetic stress is a relatively small percentage of the total stress. We review recent modelling advances accounting for this effect and validation in computational experiments. We show how this framework may be useful in capturing the complicated segregation phenomenology that emerges for dense sheared flows of particles different in both size and density.https://www.jstage.jst.go.jp/article/kona/33/0/33_2016022/_html/-char/ensegregationmixingdem simulationsmixture model |
| spellingShingle | Kimberly M. Hill Yi Fan Granular Temperature and Segregation in Dense Sheared Particulate Mixtures KONA Powder and Particle Journal segregation mixing dem simulations mixture model |
| title | Granular Temperature and Segregation in Dense Sheared Particulate Mixtures |
| title_full | Granular Temperature and Segregation in Dense Sheared Particulate Mixtures |
| title_fullStr | Granular Temperature and Segregation in Dense Sheared Particulate Mixtures |
| title_full_unstemmed | Granular Temperature and Segregation in Dense Sheared Particulate Mixtures |
| title_short | Granular Temperature and Segregation in Dense Sheared Particulate Mixtures |
| title_sort | granular temperature and segregation in dense sheared particulate mixtures |
| topic | segregation mixing dem simulations mixture model |
| url | https://www.jstage.jst.go.jp/article/kona/33/0/33_2016022/_html/-char/en |
| work_keys_str_mv | AT kimberlymhill granulartemperatureandsegregationindenseshearedparticulatemixtures AT yifan granulartemperatureandsegregationindenseshearedparticulatemixtures |