Stress hysteresis as the cause of persistent holes in particulate suspensions.
Stress hysteresis as the cause of persistent holes in particulate suspensions.
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应力滞后是颗粒悬浮液中持续存在孔洞的原因。
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. Deegan
中科院分区：
文献类型：
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作者：
R. Deegan
振动下的浓缩颗粒悬浮液可以支撑稳定的、局部的、垂直定向的自由表面。这些结构中最坚固的是持久的孔：界面上深而稳定的凹陷。使用流体动力学的简化模型，我们表明具有滞后的流变学可以导致与时间平均施加力相反的运动。此外，我们通过实验表明，玉米淀粉在水中的颗粒悬浮液在对所施加的正弦应力的剪切速率响应中表现出滞后性。我们的模型和实验的结果表明，滞后现象解释了支撑持续孔洞所需的向外力。
Concentrated particulate suspensions under vibrations can support stable, localized, vertically oriented free surfaces. The most robust of these structures are persistent holes: deep and stable depressions of the interface. Using a reduced model of the hydrodynamics we show that a rheology with hysteresis can lead to motion opposite to the time-averaged applied force. Moreover, we show experimentally that particulate suspensions of cornstarch in water exhibits hysteresis in the shear-rate response to an applied sinusoidal stress. The results of our model and our experiments suggest that hysteresis accounts for the outward force needed to support persistent holes.