Modeling of triangular perforated twisted tape with V-Cuts in double pipe heat exchanger

Enhancing the heat transfer rate in a double pipe heat exchanger is imperative for decreasing the overall cost of its operation. A popular way to increase the performance of these heat exchangers is using inserts such as twisted tape, perforated twisted tape, twisted tape with peripheral cuts, helical inserts, etc. In this paper, a novel triangular perforated twisted tape with V cut (TPTTV) has been introduced and numerical investigation has been carried out. The proposed inserts is placed in the inner pipe of the double pipe heat exchanger to create a swirl motion and increase turbulence intensity in the flow of the fluid. The simulation has been performed in the laminar flow region to turbulent flow regimes. It is found the best thermal–hydraulic performance at the lower pitch value of 50 mm. The effect of the pitch of the TPTTV insert has been extensively studied and the effect of overall heat transfer, Nusselt number, friction factor, and thermal–hydraulic factor has been reported. The value of the thermal performance factor for TPTTV insert is 1.49 which is more than the thermal performance factor of plain twist tape insert.