Analysis of tube-in-tube copper helical heat exchanger to improve heat transfer

The present work aims to investigate the effect of different configurations of tube-in-tube helically coiled heat exchanger. Commercial CFD codes were used to predict the fluid flow and heat transfer in a tube-in-tube helical heat exchanger. The model of different configurations of the inner tube has been simulated by varying the dean number. The numerical results are verified and found to be in good agreement with reported data in the literature. Nusselt Number and friction factor are evaluated for different angular positions. The use of geometry E increases the Nusselt Number and friction factor by 17.05% and 15% respectively at a Dean number of 400 as compared with a circular tube.