Couette流れにおけるアルミニウム粉末を含むタービン油の電気粘性効果

抄録

To determine the quantities affecting electroviscous effects, we studied the change of the effects due to the electric field, shear stress, volume concentration of powder and kinds of aluminum powder and turbineoil. As a result, it was found that the electroviscous effects was controlled by the non-dimensional parameter expressing the ratio of the force acting on the conductor per unit area in the electric field and the shear stress when no electric field was applied. The effects increased almost linearly with the increase of the non-dimensional quantity. The slope increased as volume-concentration of aluminum powder increased. The slope changed with the kind of alminum powder. As the grain diameter became larger, the slope increased, and a higher slope was obtained with flaky powder than with granular or acicular powder.