Design and mathematical analysis of a concentric Triple Tube Heat Exchanger for better heat transfer

Abstract

In the present work, mathematical analyses have been performed for different designs of a concentric triple tube heat exchanger for the enhancement of thermal performance. The main objective of the present work is to perform mathematical analysis of triple concentric tube heat exchanger has to be designed for the various conditions using graphene nanoplatelets–platinum nano-fluid. Concentric triple tube heat exchanger used without baffle, straight baffle and inclined baffles with the inclination angle of 45°, 60° and 75°. For this analysis of concentric triple tube heat exchanger are divided into three different domains such as two cold fluids in the inner and outer tube and one hot fluid in the middle tube at different nano-fluid concentration including 0.0, 0.02, 0.06 & 0.1%. Results show that triple tube heat exchanger with inclined baffle at 75° gives maximum outlet temperature for nano-fluid of 20.77 °K for ø = 0.1which is 21.71% greater than without baffle, 33.56 % greater than straight baffles and 20.58% greater than baffles inclined at 60°. The heat transfer rate of 17.98% higher than without baffle, 27.79% higher than straight baffle and 17.04% higher than baffles inclined at 60°, while the maximum overall heat transfer coefficient of 0.9832 for ø = 0.1 have been observed. Hence concentric triple tube heat exchanger with inclined ribs at 75° recommended for better heat transfer.

URN:NBN:sciencein.jist.2023.v11.505