Unified understanding of physics on granular drag force
| Project/Area Number |
21684021
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Mathematical physics/Fundamental condensed matter physics
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| Research Institution | Nagoya University (2011)
Kyushu University (2009-2010) |
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Principal Investigator |
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥27,040,000 (Direct Cost: ¥20,800,000、Indirect Cost: ¥6,240,000)
Fiscal Year 2011: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2010: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2009: ¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
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| Keywords | 粉体 / 衝突 / 応力伝播 |
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| Research Abstract |
Due to its discreteness, the behavior of bulk granular matter is much different from usual fluids or solids. Therefore, the fundamental understanding of the unique behavior for granular matter has not been enough yet. Particularly, we focus on the granular drag force to understand the fundamentals of the granular physics, in this research project. Recently, some research groups have independently performed granular drag force experiments, and obtained various results. However, there has not been any unifying concept. We carried out two kinds of experiments in order to solve this desperate situation. The one is the impact between a granular layer and a liquid droplet. The other one is the simultaneous measurement of drag force and wall pressure by a solid penetration into a granular column. From the former experiment, we have found some novel crater shapes that have never observed in other impact experiments. In addition, we have revealed the scaling relation for the crater radius using a dimensionless parameter. From the latter one, on the other hand, we have found nonlinear scaling laws for slow granular drag force and induced wall pressures. By detailed analyses of the experimental results, we have concluded that the origin of nonlinearity of the scaling relates to the attenuation at grains boundaries. Through these experimental results, we have now obtained some fundamental understandings for the granular drag force.
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Report
(4 results)
Research Products
(35 results)
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[Presentation] 水滴と粉体の衝突現象2010
Author(s)
桂木洋光
Organizer
非平衡系の物理-非平衡ゆらぎと集団挙動-
Place of Presentation
京都大学基礎物理学研究所
Year and Date
2010-11-20
Related Report
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