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Shear-induced diffusion in cohesive granular flows: effect of enduring clusters

机译:剪切诱导的粘性颗粒流量的扩散:持久簇的影响

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We investigate the effect of intergranular cohesive forces on the properties of self-diffusion in dense granular flows. The study is based on a series of simulated plane shear flows at different inertial and cohesion numbers, in which transverse diffusivities are measured. Results evidence an increase in diffusivity by up to two orders of magnitude when introducing cohesion. This strong effect is analysed using the Green-Kubo framework, expressing the diffusivity in terms of instantaneous grain velocity fluctuations and their time correlation. This analysis shows that cohesion, by forming enduring clusters in the flow, enhances the velocity fluctuations and their time persistence, which both contribute to enhancing grain mixing and self-diffusion.
机译:我们调查晶间粘性力对致密粒状流动中自扩散性能的影响。 该研究基于不同惯性和凝聚量的一系列模拟平面剪切流,其中测量横向扩散性。 结果证据在引入内聚力时,在引入凝聚时增加了两个数量级的扩散率。 使用绿色kubo框架分析这种强烈的效果,在瞬时粒度速度波动和时间相关方面表达扩散性。 该分析表明,通过在流动中形成持久簇,增强了速度波动及其时间持久性,这两者都有助于提高晶粒混合和自扩散。

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