This book discusses the heat transfer analysis on two-dimensional steady free or mixed convection flow of Newtonian or non-Newtonian fluids over a stretching surface or upper horizontal surface or squeezing channel. This book is divided into eight chapters. The governing equations of the flow under consideration were solved with the appropriate boundary conditions by using well established numerical technique Keller Box Method or Runge-Kutta-Fehlberg method of fourth and fifth order.