流动乳状液中应力重分布的实验测量
Experimental measurements of stress redistribution in flowing emulsions
摘要：
我们研究了如何改变局部重排液滴内流动的致密准二维乳液在面积分数$ϕ\geq 0.88$的应力。使用显微镜，我们测量液滴的位置，同时使用它们的变形形状来测量液滴应力。我们发现，重排改变附近的应力在一个四极模式：对相邻液滴的应力往往会减少或增加，这取决于位置。随着$ϕ$的增加，应力重分布更加各向异性。应力再分布的空间特征影响随后的重排发生的位置。我们的研究结果提供了直接的定量支持的流变理论致密的非晶材料，连接本地重排附近的应力变化。
英文摘要：
We study how local rearrangements alter droplet stresses within flowing dense quasi-two-dimensional emulsions at area fractions $ϕ\geq 0.88$. Using microscopy, we measure droplet positions while simultaneously using their deformed shape to measure droplet stresses. We find that rearrangements alter nearby stresses in a quadrupolar pattern: stresses on neighboring droplets tend to either decrease or increase depending on location. The stress redistribution is more anisotropic with increasing $ϕ$. The spatial character of the stress redistribution influences where subsequent rearrangements occur. Our results provide direct quantitative support for rheological theories of dense amorphous materials that connect local rearrangements to changes in nearby stress.
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