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An examination of the rheology of flocculated clay suspensions

机译：絮凝粘土悬浮液的流变学检查

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摘要

A dense cohesive sediment suspension, sometimes referred to as fluid mud, is a thixotropic fluid with a true yield stress. Current rheological formulations struggle to reconcile the structural dynamics of cohesive sediment suspensions with the equilibrium behaviour of these suspensions across the range of concentrations and shear. This paper is concerned with establishing a rheological framework for the range of sediment concentrations from the yield point to Newtonian flow. The shear stress equation is based on floc fractal theory, put forward by Mills and Snabre (1988). This results in a Casson-like rheology equation. Additional structural dynamics is then added, using a theory on the self-similarity of clay suspensions proposed by Coussot (1995), giving an equation which has the ability to match the equilibrium and timedependent viscous rheology of a wide range of suspensions of different concentration and mineralogy.
机译：稠密的粘性沉积物悬浮液，有时也称为流体泥，是具有真正屈服应力的触变流体。当前的流变学配方难以使粘性沉积物悬浮液的结构动力学与这些悬浮液在浓度和剪切范围内的平衡行为相协调。本文涉及为从屈服点到牛顿流的泥沙浓度范围建立流变学框架。剪应力方程是基于絮状分形理论，由Mills和Snabre（1988）提出。这导致了类卡森流变方程。然后，使用库斯科（Coussot）（1995）提出的关于粘土悬浮液自相似性的理论，添加了附加的结构动力学，从而给出了一个方程，该方程具有匹配各种浓度和不同粘度的悬浮液的平衡和随时间变化的粘性流变性的能力。矿物学。

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