In this paper, a numerical solution of flow and heat transfer in micropolar fluid outside a stretching
permeable cylinder with thermal stratification and suction/injection effects. The governing system of partial
differential equations is converted to ordinary differential equations by using similarity transformations,
which are then solved using numerical technique. The cases of strong concentration of microelement
and weak concentration of microelement were considered. Our purpose from this study is to investigate
the effects of the governing parameters, namely the suction/injection parameter, thermal stratification
parameter, Prandtl number, vortex viscosity parameter and Reynolds number on the velocity profiles,
pressure distributions, angular velocity profiles and temperature profiles as well as the skin friction
coefficient, dimensionless wall couple stress and the Nusselt number. The numerical results are validated
by favorable comparisons with previously published results. The results are shown graphically. The values
of the skin friction coefficient, dimensionless wall couple stress and the Nusselt number are presented in
tables. Copyright  2011 John Wiley & Sons, Ltd.