Homogenous-Heterogeneous Reactions in the Flow Of Pseudo-Plastic Nanofluid.

Abstract

The purpose of the present study is investigating the heat transfer of non-Newtonian pseudo-plastic nanofluid flow on a moving permeable flat plate with viscous dissipation and heat absorption/generation. The flow is uniform and parallel to the moving flat plate, and both flat plate and flow are moving in the same directions. The investigated parameters in this study are power-law index, permeability parameter, Eckert number, volume fraction of nanoparticles, nanoparticles type, velocity ratio and heat absorption/generation parameter. The nanoparticles used in this paper are 𝐴𝑙2𝑂3, 𝑇𝑖𝑂2, Cu and CuCo dispersed in the base water and sodium carboxymethyl cellulose/water as the base fluid. By using suitable transformations, the governing partial differential equations are converted into the ordinary differential equations, and after that, the resulting ODEs are solved with Runge–Kutta numerical method. The results of this investigation showed that heat transfer of Newtonian and non-Newtonian nanofluids in the presence of viscous dissipation and generation/absorption of heat has an interesting behavior: For Newtonian fluid, by increasing the amounts of high-conductive nanoparticles to carrying fluid, a higher heat transfer is not obtained. For instance, copper nanoparticles, despite having highest thermal conductivity compared to other nanoparticles, show the lowest local Nusselt number. However, for pseudo-plastic non-Newtonian nanofluids the reversed trend was observed. Furthermore, in both Newtonian and non-Newtonian nanofluids, the local Nusselt number decreased by increasing injection parameter, heat generation or volume fraction of nanoparticles. Also effect of chemical reaction within the PP nanofluid flow in the presence of magnetohydrodynamic, heat generation/absorption phenomena and generalized slip condition also considered.