Heat transfer enhancement has been always a significantly interesting topic in order to develop high efficient, low cost, light weight, and small heat exchangers. This book was focused on investigating whether the use of cross arrangement aerofoil inserts can enhance heat transfer characteristics for a annular channel were tested for four different Reynolds numbers ranging from 19000 to 68000 with experimentally and computationally. The factor like variations of Temperatures, average Nusselt Numbers, friction factor and pressure drop on with cross & align arrangement of aerodynamic bead shape geometry inserts has been studied.