Abstract
Second law analysis of three-dimensional flow of convectional nanofluid Al2O3-H2O and hybrid Cu-Al2O3-H2O nanofluid is performed. In the boundary layer flows, the energy dissipation due to frictional heating is of prime interest and one of the main source of entropy generation, therefore the energy dissipation term is incorporated in the energy equation. Thermophysical models are used to investigate the entropy generation across the boundary layer. The three-dimensional boundary layer equations are reduced to self-similar differential equations via similarity transformations. The reduced differential equations are solved numerically by means of Runge-Kutta and shooting method. To verify our numerical code, the reduced set of differential equations is also solved numerically by using Matlab built-in boundary value solver bvp4c. An excellent agreement is found between the obtained results. The computed velocity and temperature profiles are used to compute entropy generation and Bejan number. In order to get a clear insight into the problem various graphs are plotted and discussed against different physical flow parameters.