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Entrance region flow in concentric annuli with rotating inner wall for Bingham non-Newtonian fluid has been studied numerically. The inner cylinder is assumed to be rotating with a constant angular velocity ω and the outer cylinder to be stationary. Finite difference analysis is used to obtain the velocity components U, V, W and the distribution of pressure P along the radial direction R. With Prandtl's boundary layer assumptions, the continuity and momentum equations are solved iterativelydoi:10.32973/jcam.2016.010 fatcat:vy3jgw6xq5c7beq4wngtwlqldy