Abnormal Viscosity of A1 Electro-Rheology Fluid

The viscosity of the mixture of metal particles Al and silica oil is studied under different ac electric field at room temperature. The viscosity increases with rising field until a maximum (about two times of that at zero field) at about 2.5MV/m and a tendency of decrease appears after this critical field. Microscope observation shows that this special behavior corresponds to the formation and destruction of fiber structure in A1 electro-rheology fluids.