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Wall adhesion effects during batch sedimentation of strongly flocculatedcolloidal gels are commonly assumed to be negligible. In this study in-situmeasurements of colloidal gel rheology and solids volume fraction distributionsuggest the contrary, where significant wall adhesion effects are observed in a110mm diameter settling column. We develop and validate a mathematical modelfor the equilibrium stress state in the presence of wall adhesion under bothviscoplastic and viscoelastic constitutive models. These formulations highlightfundamental issues regarding the constitutive modeling of colloidal gels,specifically the relative utility and validity of viscoplastic and viscoelasticrheological models under arbitrary tensorial loadings. The developed model isvalidated against experimental data, which points toward a novel method toestimate the shear and compressive yield strength of strongly flocculatedcolloidal gels from a series of equilibrium solids volume fraction profilesover various column widths.

Wall Adhesion and Constitutive Modelling of Strong Colloidal Gels