EPJ Plus your physics journal EPJ .org Eur. Phys. J. Plus (2014) 129: 217 DOI 10.1140/epjp/i2014-14217-9 Parallel and perpendicular flows of a micropolar fluid between slip cylinder and coaxial fictitious cylindrical shell in cell models H.H. Sherief, M.S. Faltas, E.A. Ashmawy and A.M. Abdel-Hameid