剪切力作用下搅拌颗粒介质的流变机制

Olfa D'Angelo, Matthias Sperl, W. Till Kranz
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引用次数: 0

摘要

搅拌颗粒介质具有丰富的流变学特性:它们在低剪切速率和低密度时表现出牛顿行为,在高密度时产生屈服应力,在快速剪切时又会出现巴格诺尔德剪切增厚--这使得它们很难用一个理论框架来涵盖。我们测量了空气流化玻璃颗粒的流变性,其剪切速率跨越了五个数量级,结果表明所有流变状态都可以用无二维数来描述。我们提出了一种构成关系,可在一个统一的框架中定性和定量地捕捉所有流动行为。
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Rheological regimes in agitated granular media under shear
Agitated granular media have a rich rheology: they exhibit Newtonian behavior at low shear rate and density, develop a yield stress at high density, and cross over to Bagnoldian shear thickening when sheared rapidly -- making them challenging to encompass in one theoretical framework. We measure the rheology of air-fluidized glass particles, spanning five orders of magnitude in shear rate, and show that all rheological regimes can be delineated by two dimensionless numbers. We propose a constitutive relation that captures all flow behaviors, qualitatively and quantitatively, in one unified framework.
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