Numerical investigation of nanofluid Al2O3/water in elliptical tube equipped with twisted tape

This research was undertaken to investigate the thermal effect of Al2O3- water nanofluid flow with twisted tapes in elliptical tubes through the use of a numerical method. Simulation was done for three-dimensional and incompressible flow with constant properties in the Reynolds range. The numerical results demonstrated that adding Al2O3 nanoparticles to water as a baseflow caused an increase in the heat transfer enhancement of the nanofluid compared to that of the base fluid. The obtained results show that simultaneous use of twisted tape with nanofluid had a better influence on heat transfer enhancement and thermal efficiency compared to the single usage of nanofluid or twisted tape, separately. Specifically, results showed that increasing the concentration of nanofluid and decreasing the twisted tape ratio caused increases in Nusselt number, thermal efficiency, and pressure.