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V. N. Matveenko*, E. A. Kirsanov
Viscous elasticity of suspensions within the
framework of a structural model
Abstract
An oscillating shear flow of suspensions is
considered as a case of a periodically varying shear flow similar to a
stationary shear flow. Within the framework of the structural rheological
model, the dependence of the dynamic moduli on the cyclic frequency is
explained as a result of changes in the structure of the dispersed system. The
use of the equations of the structural rheological model makes it possible to
describe the dependences of the loss modulus and the accumulation modulus on
the shear vibration frequency without using mechanical models of the damper and
the spring. The possibility of applying the structural model to suspensions of
particles of various origins and the method of stabilizing the suspension is
shown. The presence of different regimes of oscillating flow in individual
frequency intervals is explained by the nature of the change in the structure
of disperse systems under the action of shear.
Key words: viscoelasticity, dispersed systems,
suspensions, structural rheological model.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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