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In the present paper, laminar and turbulent forced convection flows in a horizontal pipe with Al2O3-water nanofluid are considered numerically. A single phase model formulation is used for comparison with the mixture model. Temperature-dependent fluid properties are taken into account for all cases. The heat transfer coefficients computed with the mixture model showed a better agreement with experimental data reported in the literature as compared to the single phase model. Temperature-dependent fluid properties result in a better prediction of the thermal field under the effect of a constant heat flux, whereas calculations with constant fluid properties result in an over prediction of the heat transfer coefficient. The results are presented and discussed for six values of the Reynolds number covering the laminar and turbulent flow regimes and four values of the concentration in nanoparticles within the range 0≤φ≤2%.

Numerical Simulations of Al2O3 Nanofluid Flows in the Laminar and Turbulent Regimes in a Uniformly Heated Pipe