The increase in the viscosity of magnetic and electrorheological fluids under the application of magnetic and electric fields allows these fluids to be used in various potential applications such as dampers, light scattering in a thin film, actuators, etc. However, it has been observed that the increase in shear stress due to the application of magnetic field on magnetic fluid is very low compared to electrorheological fluid under electric field. In this paper, we focus on cluster formation and their contribution to the difference in viscosity increase between magnetic and electrorheological fluids under magnetic and electric fields, respectively. It has been found that the characteristics of clusters contribute very much to the difference in viscosity among magnetic and electrorheological fluids. And also, the surface in contact with the liquid in viscosity measurement is found to influence the magnitude of the viscosity.
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