A few fundamental steady flows of polar fluid, i. e. , flow in a circular tube, flow between two parallel plates and flow between two coaxial cylinders are analyzed with the help of the theory of Eringen. Couple stress and spin angular momentum are considered in this approach. The exact solutions for velocity, micro-rotation, vorticity and shearing stress are obtained mathematically. These solutions are characterized by two parameters, i. e. , the ratio of viscosities epsilon and the size effect parameter lambda which do not appear in a Newtonian fluid. epsilon is the ratio of vortex viscosity to shear viscosity. epsilon means the size relation between the corpuscle and the characteristic length. The solutions are compared with those of Newtonian fluid and it is investigated how they vary with epsilon and lambda . Apparent viscosity is determined for each flow. Material constants of polar fluid can be decided from these apparent viscosities.
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