分散系ER流体のせん断応力の周波数応答

概要

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The frequency response of shear stress of an electrorheological (ER) fluid to sine wave changes in the applied electric field is investigated for constant shear rates. The ER fluid used in the present study consists of cellulose suspended in silicone oil. Unipolar and bipolar waves electric fields, and constant ones are used. Amplitudes of the electric fields are 0.1 and 0.4 kV/mm and DC component is 0.5 kV/mm for unipolar wave electric fields. On the other hand, amplitudes of the electric fields are 0.4 and 0.9 kV/mm for bipolar wave electric fields. The frequency of the electric fields is changed from 0.1 to 100 Hz. The average values, the amplitudes and the phase angles of the shear stress are measured. Dependence of the shear stress on electrical excitation frequency is investigated. Furthermore the mathematical model is used to approximate the unsteady behavior of the shear stress by a first-order response under application of the electric fields. The effect of electrical change on the shear stress is explained from the calculated and experimental results.
1998-08-25