Internal dynamics of Newtonian and viscoplastic fluid avalanches down a sloping bed
Internal dynamics of Newtonian and viscoplastic fluid avalanches down a sloping bed
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DOI：
10.1063/1.4718018
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发表时间：
2012-05
影响因子：
4.6
通讯作者：
N. Andreini;G. Epely-Chauvin;C. Ancey
中科院分区：
文献类型：
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作者：
N. Andreini;G. Epely-Chauvin;C. Ancey
我们实验性地研究了流体雪崩的传播（即，固定体积的流体）沿着倾斜的水槽向下。重点是头部内的速度场。使用特定的成像技术，我们能够测量远离侧壁的流动流体内的速度分布。我们研究了牛顿和粘塑性流体的行为，各种水槽倾角和初始质量。对于牛顿流体测试（甘油和Triton X100），我们比较了测量的速度场与预测的润滑理论。只要流动雷诺数Re足够低（通常Re < 1），理论和实验之间就有极好的一致性，除了接触线后面的非常薄的区域。对于较高的雷诺数（通常Re ≥ 10），理论和实验之间的差异更加显著（对于物体，相对误差高达17%）。作为粘塑性材料，我们使用Carbopol ultrez 10。对于身体来说，理论和...
We experimentally investigated the spreading of fluid avalanches (i.e., fixed volumes of fluid) down an inclined flume. Emphasis was given to the velocity field within the head. Using specific imaging techniques, we were able to measure velocity profiles within the flowing fluid far from the sidewalls. We studied the behavior of Newtonian and viscoplastic fluids for various flume inclinations and initial masses. For the Newtonian fluids tested (glycerol and Triton X100), we compared the measured velocity field with that predicted by lubrication theory. Provided that the flow Reynolds number Re was sufficiently low (typically Re < 1), there was excellent agreement between theory and experiment except for the very thin region just behind the contact line. For higher Reynolds numbers (typically Re ∼ 10), the discrepancy between theory and experiment was more marked (relative errors up to 17% for the body). As viscoplastic materials, we used Carbopol ultrez 10. For the body, agreement between theoretical and ...