In this paper, the three-dimensional CFD modeling studies on heat transfer, friction factor and thermal performance of concentric tube heat exchanger using twisted tapes (Plain, V-cut, Jagged V-cut) with different twist ratios (y=2.0, 4.0) are used. Twisted tapes are used to augment the heat transfer by creating turbulence in the fluid flow. Various methods are applied to increase the thermal performance of heat transfer devices such as treated surfaces, rough surfaces, swirling flow devices, coiled tubes, and surface tension devices. Out of these twisted tape method is used to increase the thermal performance. Twisted tape inserts on the effectiveness of heat exchanger have analyzed for different Reynolds Number. The maximum thermal performance factor was obtained by the Jagged V-cut twisted tape (H=50) insert compare to other twisted tapes. Simultaneously the friction factor has been analyzed.