Entropy generation analysis in a tube heat exchanger integrated with triple blade vortex generator inserts

The present study mainly concerns the analysis of entropy generation for a heat exchanger tube integrated with triple blade vortex generator as an inserts. The Augmentation entropy generation number is adopted as the performance evaluation criterion for heat exchanger. In addition to entropy generation, heat transfer in terms of Nusselt number and frictional characteristics are also presented. The data for analysis is obtained from rigorous experiments that are performed in a tube integrated with triple blade vortex generator inserts. The variable geometrical parameters of triple blade vortex generator are pitch ratio (2,3, and 4) and the perforation index (0%, 25%). The operating parameter is Reynolds number having a range of 6,000-24,000. The results reveal the maximum Nusselt number and friction factor of 252.4 and 3.10, respectively for pitch ratio of 1% and 0% perforation index. Entropy generation rate in triple blade vortex generator inserts equipped tube is less in regard of smooth tube. Entropy generation as a result of heat transfer is very high in comparison of entropy generation resulting from the friction. All values of augmentation entropy generation number are less than 1, and minimum is achieved for pitch ratio of 1% and 0% perforation index.