Dynamic responses of electrorheological fluid in steady pressure flow |
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| Authors: | Y J Nam M K Park R Yamane |
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| Institution: | (1) Department of Mechanical and Intelligent Systems Engineering, Graduate School, Pusan National University, Busan, 609-735, Republic of Korea;(2) Department of Mechanical Engineering, Pusan National University, Busan, 609-735, Republic of Korea;(3) Department of Mechanical Engineering, Kokushikan University, 4-28-1, Setagaya-Ku, Tokyo 154-8515, Japan |
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| Abstract: | The dynamic responses of the electrorheological fluid in steady pressure flow to stepwise electric fields are investigated
experimentally. First of all, the transient responses of the ER fluid under various electric field strengths and flow velocities
are obtained from the pressure behaviors in the flow channel with two parallel-plate electrodes. The response times are exponentially
decreased with the increase of the flow velocity and the decrease of the electric field strength. Next, the relationship between
the dynamic pressure behaviors of the ER fluid and the cluster structure formation processes of the ER particles is investigated
using the flow visualization technique. Through the comparison study, it is verified that the dynamic responses of the ER
fluid in the flow mode are mainly caused by the cluster densification process in the competition of the electric field-induced
particle attraction and the hydrodynamic force, unlike those in the shear mode determined by the particle aggregation process. |
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