A Study on the Squeezing Flow of Electrorheological Suspensions

Theoretical analysis shows that the dynamic yielding stress, apparent viscosity, and average normal stress of electrorheological suspensions are greatly strengthened with the variation of rheological gap and changes in the electric field strength during the squeezing process under a constant voltage. In this process the dynamic yielding stress varies in inverse proportion to the α th power with the gap size, the apparent viscosity varies in inverse proportion to the square of the gap, and the average normal stress varies in inverse proportion to the 5th order with the gap size. It is shown that the electro yielding stress and the average normal stress of the electrorheological suspension during a squeezing flow reach greater values than are obtainable during the Poiseulle and Couette flows, thus meeting needs in engineering applications.