The electrorheorogical (ER) effect is known as a phenomenon that shows reversible increases of apparent viscosity by applied electric field. The electric field induces the particle polarization, resulting in the chains between the electrodes. In this study, the ER fluids in the channel with two parallel electrodes were visualized under the pressure flow. The laser light sheet and transparent electrodes were used in the experimental apparatus to visualize the particles under 10wt% concentration. The particle chain structure in the channel was clearly visualized. Under higher voltage condition, particle layers were formed at the neighbor of the electrodes. Processing the visualized images, the effects of the chain structure and the layer on the flow resistance were investigated.
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