Unsteady stagnation-point flow and heat transfer over an exponential stretching sheet in Copper-water nanofluid with slip velocity effect

Abstract

This paper is performed in order to study the behavior of unsteady stagnation-point flow and the heat transfer in nanofluid with the presence of velocity slip over an exponential stretching sheet. The nanofluid model namely Tiwari-Das model is considered where the influence of volume of nanoparticle in the base fluid is also part of the focus in this study. Copper is the nanoparticle and water is chosen as the base fluid. The transformation of governing equation in partial differential equations form to the system of ordinary differential equations is carried out using suitable similarity variables. The system is solved using bvp4c program in Matlab software where the numerical results for dual solutions are presented graphically for the skin friction coefficient, the local Nusselt number and the velocity as well as the temperature profiles are obtained for different parameters namely, velocity slip, nanoparticle volume fraction, suction/ injection and unsteadiness parameters.