Free or mixed convection boundary layer flow and heat transfer characteristics over a nonlinearly stretching surface or wedge surface or stretching cylinder with five different types fluid models like Ferrofluid, Prandtl - Eyring fluid, Casson fluid, Maxwell nanofluid and engine oil fluid with heat transfer are numerically investigated. This book is divided into six chapters. The governing equations of the flow under consideration were solved with the appropriate boundary conditions by using well established numerical technique spectral relaxation method.