This work presents experimental investigation of heat transfer enhancement using strip insert with cross configuration having rectangular cut. The heat transfer enhancement study in a circular copper tube of 10 mm internal diameter is carried out using three different inserts. The three inserts are of cross configuration with rectangular cuts of different pitches. The heat transfer enhancement in hydro-dynamically developed and thermally developing fluid region is studied. It is found from the results that the heat transfer rate has improved while using inserts, because of good mixing of fluid particles inside the tube. It is found from the pressure measurements that little pressure drop is also associated with the heat transfer enhancement. Three cross inserts have been used with rectangular cuts of various pitches (15, 20, and 25 mm). Thermal performance factor is determined for the inserts and it is more than one. It is found from the experiments that pressure drop increases while reducing the pitch of rectangular cuts. It is found from this experiment that the insert having 20 mm pitch shows good thermal and hydraulic performance. Keywords: Cross insert, hydro-dynamically developed, thermally developing, heat transfer enhancement
