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1 International Journal of Applied Mechanics and Engineering

1 2002

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Application of the electric field for reducing the suspension effective viscosity

Taran E. Y., Pridatchenko Y. V., Gryaznova V. A.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, Spec. is

93-98

The special features of electrorheological control over effective viscosity of dilute suspension with axisymmetric rigid suspended particles in a simple shear flow using a cross electric field are investigated. It is demonstrated that if the suspension carrier fluid is anisotropic then the orientation of suspended particles under the action of hydrodynamic forces and forces of electric field can lead to an anomalous reducing the suspension effective viscosity below the value of the effective viscosity of the carrier fluid. As a rheological model of the electrically neutral suspension carrier fluid and a hydrodynamic model of suspended particles, which have permanent dipole moment, the Ericksen anisotropic fluid and uniaxial dumbbell are used. The rheological equations of the suspension are obtained within the framework of the structure-phenomenological approach. The results obtained can be used in the lubricant rheology for the study of the possible influence of the orientation of particles of additives added to liquid crystalline lubricants for controlling their rheological properties.