(in lingua inglese)
The present study provides the numerical solutions for unsteady boundary layer flow of a Casson fluid and heat transfer over a stretching surface. Fluid velocity decreases initially due to increase in unsteadiness parameter. The temperature also decreases significantly in this case. The effect of increasing values of the Casson parameter is to suppress the velocity field, whereas the temperature is enhanced with increasing Casson parameter. Prandtl number can be used to increase the rate of cooling in conducting flows.