Heat exchangers are mostly used in many areas of the industries. Hence, the use of high performance heat exchangers is very important for saving energy. Twisted tape swirl tabulator is one of the commonly used passive types for heat transfer augmentation due to their advantages of steady performance, simple configurations and ease of installation. It generates swirling flow and causes improved fluid mixing between central region and the near wall region, therefore, the heat transfer in tubes can be enhanced by fluid mixing.