Experimental Studies on Non-Newtonian Fluid Flows as Analogues of Lava Flows: Toward a Numerical Model with a Cooling Crust
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- MIYAMOTO Hideaki
- Department of Geosystem Engineering, University of Tokyo
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- ITOH Kazumasa
- Department of Geosystem Engineering, University of Tokyo
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- KOGURE Junichi
- Department of Geosystem Engineering, University of Tokyo
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- TOSAKA Hiroyuki
- Department of Geosystem Engineering, University of Tokyo
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- TOKUNAGA Tomochika
- Department of Geosystem Engineering, University of Tokyo
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- FUKUI Katsunori
- Department of Geosystem Engineering, University of Tokyo
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- MOGI Katsuro
- Department of Geosystem Engineering, University of Tokyo
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説明
Through laboratory experiments and measurements, we confirmed that kaolin-water slurry and paraffin wax are very useful to simulate lava flows. Kaolin slurry is a good simulant for a slow moving isothermal lava flow which has a main rheological control. However, a theoretical analysis and some laboratory runs compared with real lava flows strongly suggest an intrinsic problem on this isothermal approach: the surface crust will be significant for a flow morphology after the transition time. To understand a development of a cooling crust and its complicated effect on a flow morphology, we have attempted laboratory experiments using paraffin wax which is especially useful for its relatively low solidus temperature. Although the movement of a flow with a surface crust is not fully understood, our simple analysis suggests that the maximum thickness attained by the inflation process before a breakout, can roughly be estimated by balancing the overpressure and tensile strength. Our model can also estimate the maximum lateral length between the original and the second flow unit after the breakout. These results will strongly help in understanding the complicated and unmodeled compound flow behaviour, which would greatly improve the accuracy of existing numerical models of lava flows.
収録刊行物
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- Theoretical and Applied Mechanics
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Theoretical and Applied Mechanics 50 (0), 351-356, 2001
日本学術会議 「機械工学委員会・土木工学・建築学委員会合同IUTAM分科会」
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詳細情報 詳細情報について
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- CRID
- 1390282679184631040
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- NII論文ID
- 130004809759
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- ISSN
- 13494236
- 02856042
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
