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

SummaryA 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 ξ, the magnetic parameterM, the Prandtl number Pr, and the blowing/suction parameterfw. Increasing the Prandtl number Pr or the magnetic parameterM and decreasing the blowing/suction parameterfw decreases the skin friction coefficient. The Nusselt number increases (decreases) with an increase infw or Pr (ξ orM).

[1]  THE EFFECTS OF BLOWING AND SUCTION ON FREE CONVECTION BOUNDARY LAYERS , 1975 .

[2]  Peter Bradshaw,et al.  Finite-Difference Solution of Boundary-Layer Equations , 1984 .

[3]  A. S. Gupta,et al.  STEADY AND TRANSIENT FREE CONVECTION OF AN ELECTRICALLY CONDUCTING FLUID FROM A VERTICAL PLATE IN THE PRESENCE OF A MAGNETIC FIELD , 1960 .

[4]  Md. Anwar Hossain,et al.  Viscous and Joule heating effects on MHD-free convection flow with variable plate temperature , 1992 .

[5]  J. Merkin.  Free Convection Boundary Layers on Cylinders of Elliptic Cross Section , 1977 .

[6]  Cha’o-Kuang Chen,et al.  Laminar free convection over a horizontal circular cylinder with blowing and suction , 1983 .

[7]  D. Gray.  The laminar plume above a line heat source in a transverse magnetic field , 1977 .

[8]  N. Riley,et al.  Magnetohydrodynamic free convection , 1964, Journal of Fluid Mechanics.

[9]  P. Lykoudis,et al.  Natural convection of an electrically conducting fluid in the presence of a magnetic field , 1962 .

[10]  J. Nayfeh,et al.  HYDROMAGNETIC CONVECTION AT A CONE AND A WEDGE , 1992 .

[11]  I. Pop,et al.  Magnetohydrodynamic free convection flow over a wedge in the presence of a transverse magnetic field , 1993 .

[12]  E. Sparrow,et al.  The effect of a magnetic field on free convection heat transfer , 1961 .

[13]  Hk Hendrik Kuiken,et al.  Magnetohydrodynamic free convection in a strong cross field , 1970, Journal of Fluid Mechanics.

[14]  Roland Hunt,et al.  Magnetohydrodynamic free convection flow about a semi-infinite plate at whose surface the heat flux is uniform , 1984 .

[15]  P. Bradshaw,et al.  Physical and Computational Aspects of Convective Heat Transfer , 1984 .