Abstract
The unsteady mixed convective flow of micropolarnanofluid over an impulsively stretched vertical surface has been examined. A model has been developed to analyze the behavior of nanofluids in presentmicropolar fluids studied numerically for both cases of assisting and opposing flow taking into account the thermal convective boundary condition. A model has been developed to analyze the behavior of nanofluids containing metallic nanoparticles as copper (Cu)and nonmetallic nanoparticles as alumina (Al2O3) in water-micropolarnanofluidhave been considered. The governing partial differential equations have been transformed to non-similar differential equations then have been solved numerically by using theRunge-Kutta-Fehlberg method of seventh order (RKF7). The results have been compared with the published results and are found in excellent agreement.