Font Size: 

We investigate the convective heat and mass transfer in
magnetohydrodynamic a nanofluid through a porous medium over a
stretching sheet subject to a magnetic field, heat generation,
thermal radiation, viscous dissipation and chemical reaction
effects. The effects of porosity, heat generation, thermal
radiation, magnetic field, viscous dissipation and chemical reaction
to the flow field were thoroughly explained for various values of
the governing parameters. We have further assumed that the
nanoparticle volume fraction at the wall may be actively controlled.
Two types of nanofluids, namely Cu-water and Alumium Oxide -water are
studied. The physical problem is modeled using systems of nonlinear
differential equations which have been solved numerically using the
spectral relaxation method. Comparing the results with those
previously published results  in the literature shows excellent
agreement.