Numerical investigation of heat transfer of nanofluid flow inside helical tube with twophase mixture model

Numerical simulation of developing laminar flow and heattransfer behavior of Al2O3/water nanofluid through helicaltube is performed in this study. Two-phase mixture modelwith temperature dependent properties for water andnanofluid is used and validated against experimental data inthe literature. Simulations is carried out for variousnanoparticle volume fractions and Reynolds numbers. Thevariations of local heat transfer coefficient along the tubelength from the inlet of tube is shown. The overall heattransfer enhancement for nanofluid in comparison withwater is indicated. The results show that at the samenanoparticle volume fraction, the higher heat transferenhancement related to water is observed at lower Reynoldsnumbers.