Numerical-based Assessment on Thermal Performance Factor of TiO₂/Water Nanofluids Inside Twisted Tape Insert Tube

In this simulation, convection heat transfer, friction factor, and flowing TiO2/water nanofluids inside the double tube concentric heat exchanger for both plain and insert twisted tape insert was approached by the numerical estimation using fluent Ansys software. The numerical were carried out in the Reynolds number range from 5000 to 10,000, the particle concentrations used 0.1%, and twisted tape insert with a ratio of 7 was used. As the Reynolds number rises, the nanofluid Nusselt number increases as well. The findings demonstrated that, compared to a simple tube heat exchanger, the twisted tube heat exchanger showed increased heat transfer, and the addition of nanofluid TiO2/water can increase the Nusselt number.