Numerical solution is presented for the two-dimensionalflow of a micropolar fluid between two porouscoaxial disks of different permeability for a range of Reynoldsnumber Re (—300 ≤Re < 0) and permeability parameterA (1.0 ≤ A≤2.0). The main flow is superimposed bythe injection at the surfaces of the two disks. Von Karman'ssimilarity transformations are used to reduce the governingequations of motion to a set of non-linear coupled ordinarydifferential equations (ODEs) in dimensionless form. Analgorithm based on the finite difference method is employedto solve these ODEs and Richardson's extrapolation is usedto obtain higher order accuracy. The results indicate that theparameters Re and A have a strong influence on the velocityand microrotation profiles, shear stresses at the disks and theposition of the viscous/shear layer. The micropolar materialconstants c1, c2, c3 have profound effect on microrotationas compared to their effect on streamwise and axial velocityprofiles. The results of micropolar fluids are compared withthe results for Newtonian fluids.
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