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Dynamic Viscoelasticity of an ER Fluid in Oscillatory Slit Flow and its ER Micro-Structural Mechanism
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English
Abstract
An electrorheological fluid composed of sulfonated polymer particles in insulating oil is analyzed on nonlinear dynamic viscoelasticity in oscillatory slit flow. The viscoelastic properties are determined as a function of the electric field, the fluid strain amplitude and the oscillation frequency, and changes in the ER microstructure are studied by direct observation performed by an optical microscope. The results showed that the viscoelastic properties of the ER fluid remarkably depend on the electric field strength and on the strain amplitude. However, no dependence on the oscillation frequency was observed in the range of 2.5 to 6.9 Hz. These dependencies are explained based on the formation and deformation of ER particle clusters that span the electrodes under oscillatory slit flow. All the results are discussed in terms of pre-yield, yield and post-yield region.
Citation
Vieira, S., Aizawa, R., and Nakano, M., "Dynamic Viscoelasticity of an ER Fluid in Oscillatory Slit Flow and its ER Micro-Structural Mechanism," SAE Technical Paper 982894, 1998, https://doi.org/10.4271/982894.Also In
References
- Nakano, M. Ito, K. Konno, M. Aizawa, R. “Dynamic Viscoelasticity in Oscillatory Slit Flow of an ER Suspension Containing Sulfonated Polymer Particles” VI International Conference on Electro-Rheological Fluids, Magneto-Rheological Suspensions and their Applications Yonezawa, Japan 1997
- Nakano, M. Yamamoto, H. Jolly, M. “Dynamic Viscoelasticity of a Magnetorheological Fluid in Oscillatory Slit Flow” VI International Conference on Electro-Rheological Fluids, Magneto-Rheological Suspensions and their Applications Yonezawa, Japan 1997
- Filisko, F. “Overview of ER Technology” Progress in Electrorheology - Science and Technology of Electrorheological Materials Havelka Kathleen O. Filisko Frank E. Plenum Press 3 18 1995
- Asako, Y. Ono, S. Aizawa, R. Kawakami, T. “Properties of Electrorheological Fluids Containning Numerously Sulfonated Polymer Particles” Progress in Electrorheology - Science and Technology of Electrorheological Materials Havelka Kathleen O. Filisko Frank E. Plenum Press 147 156 1995