S054044 Squeeze Effect in a Shear Flow of Dilatant Fluids

Abstract

We examined the shear flow of dilatant fluids with a cone-plate rheometer. The dilatant fluids used in this experiment were mixtures of potato starch and water with three different concentrations. In transitional response of shear stress at a constant shear rate, it was found that the stress after beginning of flow increases abruptly. Moreover, the gap between cone and plate became small with increase of time. These results were considered due to a dilatancy of fluids and suggested the occurrence of a squeeze effect in a shear flow. However, the shear viscosity of dilatant fluids in the range of shear rate applied in this experiment showed the shear-thinning property, apparently.