We investigate the combined effects of buoyancy force and convective cooling on entropy generation in unsteady
channel flow of water based nanofluids containing Copper (Cu) and Alumina (Al 2 O 3 ) as nanoparticles. Both first and second
laws of thermodynamics are utilised to analyze the model problem. Using a semi discretization finite difference method
together with Runge-Kutta Fehlberg integration scheme, the governing partial differential equations are solved numerically.
Graphical results on the effects of parameter variation on velocity, temperature, skin friction, Nusselt number, entropy
generation rate, irreversibility ratio and Bejan number are presented and discussed