Effect of uniform blowing/suction on MHD-natural convection over a horizontal cylinder: UWT or UHF

A laminar boundary-layer analysis is used to investigate the flow and heat transfer characteristics of MHD-natural convection over a horizontal cylinder under the effect of uniform blowing/suction. The surface of the horizontal cylinder is maintained at a uniform wall temperature (UWT) or a uniform heat flux (UHF). The nonsimilar governing equations are obtained by using a suitable transformation and solved by the Keller box method. Numerical results for the dimensionless velocity profiles, the dimensionless temperature profiles, the skin friction coefficient, and the Nusselt number are presented for various values of the dimensionless coordinate xi, the magnetic parameter M, the Prandtl number Pr, and the blowing/suction parameter f(w). Increasing the Prandtl number Pr or the magnetic parameter M and decreasing the blowing/suction parameter f(w) decreases the skin friction coefficient. The Nusselt number increases (decreases) with an increase in f(w) or Pr (xi or M).