The Steady Shearing Flow Analysis of Polyaniline Type Electrorheological Fluids

The yielding stresses or viscosity of electrorheological fluids increase by order of magnitude when electric fields are applied on them. The steady flow of electrorheological fluids based on polyaniline, polyaniline/(acrylic polyelectrolyte) composite particles were studied. The relationship between shear stress and shear rate under different AC field strengths was measured. Analysis is made to study the relationship between the yielding stress, as well as sensibility of shearing, and field strength. Furthermore, in the analysis under DC field strength, pseudoplastic behavior was found and interpreted. Distinctive differences of the flow behavior between the cases under DC and AC field were found. An original and effective expression was employed to characterize the flow behavior under a DC field