The effect of radiation on natural convection flow from an isothermal circular cylinder has beenudinvestigated numerically in this study. The governing boundary layer equations of motion areudtransformed into a non-dimensional form and the resulting nonlinear systems of partial differentialudequations are reduced to convenient boundary layer equations, which are then solved numericallyudby two distinct efficient methods namely: (i) implicit finite differencemethod or the Keller-BoxudMethod (KBM) and (ii) Straight Forward Finite Difference Method (SFFD). Numerical results areudpresented by velocity and temperature distribution of the fluid as well as heat transfer characteristics,udnamely the shearing stress and the local heat transfer rate in terms of the local skin-frictionudcoefficient and the local Nusselt number for a wide range of surface heating parameter andudradiation-conduction parameter. Due to the effects of the radiation the skin-friction coefficients asudwell as the rate of heat transfer increased and consequently the momentum and thermal boundaryudlayer thickness enhanced.
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