Several decades have been spent on methods to improve the transfer of heat through compound, passive, and active heat augmentation. The present research uses air as the working fluid and non-metallic i.e. Bakelite flow divider type inserts as part of a passive heat transfer augmentation technique. This paper presents an original experimental study on heat transfer enhancement by using arrangement of 4-4 45 degree's & 90 degree's clockwise insert. This study investigates the performance of a plain tube with a 90 degree's insert & 45 degree's clockwise bipartition insert focusing on the changes in Nusselt number, Reynold number and heat transfer coefficient through experimental methods. Through this experiment comparing the result of turbulent flow without insert, with 4-4 45 degree's & 90 degree's clockwise bipartition insert. The experimental setup involved systematically varying Reynolds numbers from range of 5000 to 23000 and heat input varied from 50 V, 75 V, 100V. Through in this study it is found that Nusselt number and heat transfer coefficient changes according to voltage. For 50 V, Nusselt number and heat transfer coefficient with 4-4 45 degree's & 90 degree's clockwise bipartition insert is 106% more than without insert. For 75 V, Nusselt number and heat transfer coefficient with 4-4 45 degree's & 90 degree's clockwise bipartition insert is 87% more than without insert. For 100 V, Nusselt number and heat transfer coefficient with 4-4 45 degree's & 90 degree's clockwise bipartition insert, is 102% more than without insert. So overall experiment shows that forced convection heat transfer using 4-4 45 degree's & 90 degree's clockwise bipartition insert clockwise and anticlockwise bipartition insert gives higher Reynold Number, heat transfer coefficient and Nusselt number effectively.