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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.

Structure-phenomenological rheology of suspensions in fluids with cross viscosity

Taran E. Yu., Selezov I. T.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

27-32

The rheological constitutive equations for dilute suspensions of rigid axisymmetric particles immersed in the Reiner-Rivlin non-Newtonian incompressible isotropic fluid with constant shear and cross viscosities are obtained within the framework of structure-phenomenological approach. The effect of the cross viscosity of dispersion medium is investigated on a steady-state orientation of suspended particles possesing permanent electric dipole moment and on pseudoplastic and elasticoviscous rheological properties of suspensions in stationary simple shear flow in combination with stationary transverse electric field. The accounting of the cross viscosity in the rheological equation of the dispersion medium leads to increasing the apparent suspension viscosity and the first difference of normal stresses compared to the suspension with the Newtonian dispersion medium.