Abstract
In this article, to save the energy, turbulators were employed in a pipe with considering hybrid nanofluid. Due to low concentration, empirical correlations have been utilized to calculate the features of new carrier fluid. For selecting the turbulent model, different models were tested to find the best accommodation with experimental data for turbulent flow in existence of twisted tape and results indicated the nice accuracy of K-ε Realizable. With augment of secondary flow due to external device, the radial velocity enhances and convection coefficient enhances as well as resistance of fluid. Two configurations of turbulators were compared and outcomes were reported in term of bar charts and contours. Nu augments about 202.84% with augment of Re when TT with barrier has been utilized. Insertion of barrier makes Nu to intensify about 28.43% when Re=20,000. Friction factor declines about 3.6% with rise of inlet velocity in existence of barriers. Exergy drop reduces with rise of inlet velocity about 79.93% and 83.03% in absence and presence of barriers. Influence of adding barrier on Xd enhances if inlet velocity increases. When Re=20,000, insert of barriers make exergy drop to decline about 33.38%. Adding twisted tape leads to maximum value of PEC when Re=5000.
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