S.M.M. EL-Kabeir

Boundary-Layer Heat Transfer from a Stretching Circular Cylinder in a Nanofluid

DB = Brownian diffusion coefficient DT = thermophoretic diffusion coefficient f = reduced stream function g = gravitational acceleration K = permeability of porous medium km = effective thermal conductivity Le = Lewis number Nb = Brownian motion parameters Nt = thermophoresis parameters Nu = Nusselt number p = pressure q = wall heat flux Re = Reynolds number r; z = Cartesian coordinates S = shear stress T = temperature Tw = wall temperature of the vertical plate T1 = ambient temperature u, w = Darcy velocity components m = thermal diffusivity of porous medium = dimensionless distance = dimensionless temperature = viscosity of fluid = kinematic viscosity f = fluid density p = nanoparticle mass density c f = heat capacity of the fluid c m = effective heat capacity c p = effective heat capacity of nanoparticle material = ratio between the effective heat capacity of the nanoparticle material and that of the fluid Subscripts