To enhance the heat transfer rate in heat exchangers, different heat augmentation techniques are employed. These techniques are broadly categorized as active, passive, and compound techniques. The active techniques are mainly based on an external energy source for heat transfer, whereas the passive techniques incorporate the geometrical modifications of the heat transfer device which are the simplest and most cost-effective methods within a certain range of Reynolds numbers for the heat transfer fluid flow. Compound techniques combine active and passive methods and are used when higher heat transfer rates are required than those achievable by individual active or passive techniques. The present study mainly discussed the different heat augmentation techniques in a passive system. The study is focused comprehensively on the heat transfer augmentation through swirl created in the heat transfer fluid by employing twisted tape insertion. The results show that, the TT with p/w ratio of 3 and having semicircular cuts on the edges gives higher HT rates than the other TT configurations which are considered for the study.