Abstract
Transient responses of electrorheological fluids to square-wave electric fields in steady shear are investigated by computational simulation method. The structure responses of the fluids to the field with high frequency are found to be very similar to that to the field with very low frequency or the sudden applied direct current field. The stress rise processes are also similar in both cases and can be described by an exponential expression. The characteristic time τ of the stress response is found to decrease with the increase of the shear rate γ̇ and the area fraction of the particles φ2. The relation between them can be roughly expressed as τ∝γ̇−3/4φ2−3/2. The simulation results are compared with experimental measurements. The aggregation kinetics of the particles in steady shear is also discussed according to these results.
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