Abstract
Publications on experimental and theoretical studies of the rheological properties of concentrated suspensions of solid particles have been analyzed. According to modern concepts, the rheology of suspensions is considered as a result of contact interaction between their constituent particles due to external forces of formation and destruction of various-type conglomerate structures. A new rheological model of a highly concentrated suspension of solid particles in a Newtonian fluid is proposed, which describes both a continuous and discontinuous growth in the effective viscosity with a uniform increase in shear stress. Exact analytical formulas for the velocity profiles of suspension flows in “cone–plane” and “cylinder–cylinder” rotational viscometers, as well as a slit viscometer, are obtained. The proposed model is modified to take into account the non-Newtonian properties of a dispersion medium, which exhibits pseudoplastic and dilatant properties at low and high strain rates, respectively. The effective viscosity of such a suspension is presented as a sum of the contributions from the non-Newtonian dispersion medium and dispersed-phase solid particles. The rheology of the dispersed phase is described using the Ellis model. The velocity profiles in a pressure-driven flat channel are obtained numerically (by the finite-element method). It is shown that they can take various complex forms, depending on the model parameters.
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Skul’skiy, O.I. Rheometric Flows of Concentrated Suspensions of Solid Particles. J Appl Mech Tech Phy 62, 1165–1175 (2021). https://doi.org/10.1134/S0021894421070166
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DOI: https://doi.org/10.1134/S0021894421070166