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| Titel |
Centrifuge modelling of granular flows |
| VerfasserIn |
Miguel Angel Cabrera, Wei Wu |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250112131
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| Publikation (Nr.) |
 EGU/EGU2015-12285.pdf |
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| Zusammenfassung |
| A common characteristic of mass flows like debris flows, rock avalanches and mudflows is
that gravity is their main driving force. Gravity defines the intensity and duration of the main
interactions between particles and their surrounding media (particle-particle, particle-fluid,
fluid-fluid). At the same time, gravity delimits the occurrence of phase separation, inverse
segregation, and mass consolidation, among other phenomena. Therefore, in the
understanding of the flow physics it is important to account for the scaling of gravity in scaled
models.
In this research, a centrifuge model is developed to model free surface granular flows
down an incline at controlled gravity conditions. Gravity is controlled by the action of an
induced inertial acceleration field resulting from the rotation of the model in a geotechnical
centrifuge. The characteristics of the induced inertial acceleration field during flow are
discussed and validated via experimental data. Flow heights, velocity fields, basal pressure
and impact forces are measured for a range of channel inclinations and gravity
conditions.
Preliminary results enlighten the flow characteristics at variable gravity conditions and
open a discussion on the simulation of large scale processes at a laboratory scale. Further
analysis on the flow physics brings valuable information for the validation of granular flows
rheology. |
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