Experimental Investigation of Heat Transfer Phenomena in Triple Tube Heat Exchanger with Dimple on Internal Tube and Internal Threaded Middle Tube and its Validation using CFD Analysis

The combination of dimple tube and internal threaded tube in case of triple tube heat exchanger are a typical technique that offers a higher heat transfer increase. This study will investigates the heat transfer characteristics of a horizontal triple tube heat exchanger having internal threaded pipe in the middle & dimples on inner tube. This research work leads to findings on the effect of triple tube on heat transfer. From this research work, it is found that the applications of CFD and experimental results are nearly equal to same in triple tube heat exchanger by providing turbulence in inner tube and spiral movement of fluid in the intermediate tube of the triple heat exchanger. The system development includes the proper selection of dimensions of triple tube with help of different references and developed test rig by using water as a working fluid for both hot and cold circuits for both CFD and experimental works. After experimentation, results shows that as there is increase in Reynolds number, Nusselt number increases for both parallel and counter flow arrangement in triple tube heat exchanger. Also it is observed that as Reynolds number increases friction factor decreases for both parallel and counter flow arrangement in triple tube heat exchanger. All CFD results and experimental results are close to each other which have maximum errors nearly equal to 10%.