| イベント名 |
第12回地球惑星科学教室談話会 降伏応力流体の物理（Physics of yield stress fluids） |
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| イベント種類 | セミナー |
| 講演者(講師) | |
| イベント詳細 | 講師：大槻道夫氏（島根大学総合理工学研究科） Amorphous materials such as gels, colloidal suspensions, sands, and foams behave like fluids when the temperature is low or the density is high, but they exhibits a solid-like behavior with finite yield stress at low temperature or high density state. These materials, known as yield stress fluids, have attracted much attention over the last two decades. The transition to the solid-like states by decreasing temperature is called the glass transition, while the transition due to increasing density is known as the jamming transition. In early investigations, researchers expected a unified concept to understand the two transitions. Recent studies, however, have revealed the different origins and critical behaviors between the transitions. In this talk, recent progress in the studies of yield stress fluids will be reviewed, where two different theoretical frameworks explain the appearance of the yield stress. I will also introduce our recent results on the effect of friction on the solid-like behaviors. The friction between grains in the yield stress fluids causes a discontinuous shear thickening: a sudden jump in the stress induced by increasing shear rate, which contrasts the difference of the transitions. |
| 対象 | 教職員向け 在学生向け |
| 使用言語 | |
| キーワード | |
| 開催期間 | 2017年12月8日 16:00 〜 17:30 |
| 会場 |
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| 定員 | なし |
| 申込み方法 | 事前申込み不要 |
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