Abstract
A huge engineering application of Stagnation point flow and heat transfer towards a stretching sheet in different industries, for these reasons a tackled of this subject is very interesting. This work will focus on the entropy generation for hydromagnetic stagnation point flow of a second grade nanofluid over a stretching sheet with thermal radiation. The Boungiorno model is employed to incorporate the effects of Thermophoresis and Brownian motion. The governing equations for the flow, heat and mass transfer are non-dimensionalized and solved numerically using the using a Runge-Kutta-Fehlberg integration scheme with shooting method. The Authenticity and perfection of the numerical solution technique are proved and verified within analytical solution. A comparison of the results with the previous research work is provided. A detailed study elucidating the influences of stretching parameter, magnetic field, thermal radiation, nanofluid parameters, Lewis and Prandtl numbers on the dimensionless velocity, temperature and concentration along with entropy generation due to heat transfer, mass transfer, combined heat and mass transfer, fluid friction and magnetic field is conducted. The results obtained show that the MHD Stagnation Point Flow of a Nanofluid on a Stretching Surface is significantly influenced by the presence of thermal radiation, stretching parameter and magnetic field. Furthermore, Brinkman Number and Brownian parameters tend to increase meaningfully the total dimensionless entropy generation rate. Some of the numerical results are compared to special cases with previous published results which are available in the literature and showed a good agreement.