Radiation-conduction interaction on mixed convection from a horizontal circular cylinder

A mixed convection flow of an optically dense viscous incompressible fluid along a horizontal circular cylinder has been studied with the effect of ra diation when the surface temperature is uniform. Using appropriate transfor mations, the boundary layer equations governing the flow are reduced to loc al nonsimilarity form. Solutions of the governing equations are obtained em ploying the implicit finite difference method. Effects of varying the perti nent parameters, such as, the Planck number, R-w the surface temperature pa rameter, theta(w) and the buoyancy parameter, alpha on the local skin-frict ion and local heat transfer coefficients are shown graphically as well as i n tabular form against the curvature parameter xi, while taking Prandtl num ber Pr = 1.0. It is found that an increase of R-d, theta(w) or alpha leads to increases in the values of the local skin-friction and the local rate of heat transfer coefficients. At the stagnation point asymptotic solutions f or large value of a are also obtained and the effect of the other pertinent parameters on the formation of the flow separation are studied.