Density and size segregation in chute flow over rough surfaces
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- K. Mitani Noriko
- Earthquake Research Institute, University of Tokyo
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- Matuttis Hans-Georg
- Department of Mechanical and Control Engineering, University of Electro-Communications
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- Kadono Toshihiko
- Institute of Laser Engineering, Osaka University
Bibliographic Information
- Other Title
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- 粗い斜面上の粉体流における密度およびサイズの異なる粒子の分離
- アライ シャメン ジョウ ノ フンタイリュウ ニ オケル ミツド オヨビ サイズ ノ コトナル リュウシ ノ ブンリ
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Abstract
The main parts of pyroclastic flow deposits show various characteristic features, such as density and size segregation of large fragments in the vertical direction. To understand the mechanisms that produce these features, we numerically simulated granular flows on an inclined rough surface with compositional impurities differing in size and density from matrix particles. The simulations show that, in flows with heterogeneous size and density distributions, the impurities rise or sink in the matrix according to their density. With increasing size of impurities and increasing density difference between impurities and matrix particles, the rate of rising or sinking of impurities increases. Observations of density and size segregation in agitated granular systems indicate that impurities are subject to buoyancy and granular viscous forces. The behavior of impurities in the central parts of flows obeys the laws governing the flow of viscous fluids.
Journal
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- The Journal of the Geological Society of Japan
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The Journal of the Geological Society of Japan 117 (3), 116-121, 2011
The Geological Society of Japan
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Details 詳細情報について
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- CRID
- 1390282681215662208
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- NII Article ID
- 130000758391
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- NII Book ID
- AN00141768
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- ISSN
- 13499963
- 00167630
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- NDL BIB ID
- 11069310
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed