Abstract
An analysis is performed to study the problem of double diffusive forced convection boundary-layer flow over a non-isothermal horizontal surface embedded in a porous medium saturated with a water-based nanofluid. The model identifies the Brownian motion and thermophoresis as the primary mechanisms for enhanced convection of the nanofluid. The behavior of the porous medium is described by the Darcy model. The horizontal surface is maintained at a variable temperature, solute concentration and nanoparticle volume fraction in the power law form. The governing partial differential equations are transformed into a set of non-similar equations and solved numerically. Comparisons with previously published work are presented and an excellent agreement is obtained. A parametric study is conducted and a representative set of numerical results for the dimensionless velocity, temperature, concentration, and volume fraction profiles as well as the reduced Nusselt and the two reduced Sherwood numbers is shown graphically to show interesting features of the solutions.