Soret and Dufour Effects on Double-Diffusive Free Convection from a Frustum of a Wavy Cone in Porous Media with Nonuniform Wall Temperature and Concentration

摘要

This work studued the Soret and Dufour effects on double-diffusive free convection near a frustum of a wavy cone in a porous medium with nonuniform wall temperature and concentration. The nonsimilar boundary layer equations are derived by the coordinate transform and the boundary-layer approximation, and then solved by the cubic spline collocation method. The effects of important parameters on the heat and mass transfer characteristics have been studied. Results show that an increase in the Dufour parameter decreases the local Nusselt number and increases the local Sherwood number. Moreover, increasing the Soret parameter decreases the local Sherwood number and increases the local Nusselt number. Increasing the exponent for surface temperature and concentration tends to increase both the heat and mass transfer rates. Moreover, increasing the dimensionless amplitude increases the fluctuations of both the local Nusselt number and the Sherwood number with the streamwise coordinate.