An examination of the rheology of flocculated clay suspensions

Spearman, J. (2017) An examination of the rheology of flocculated clay suspensions. Ocean Dynamics, 67 (3-4). pp. 485-497.

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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 time-dependent viscous rheology of a wide range of suspensions of different concentration and mineralogy.

Item Type: Article
Uncontrolled Keywords: Clay suspension; Rheology; Flocculation; Rheological model; Structural dynamics; Self-similarity
Subjects: Maritime > General
Divisions: Maritime
Depositing User: Unnamed user with email
Date Deposited: 02 Apr 2020 09:53
Last Modified: 02 Apr 2020 09:53

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