In the present paper laminar flow forced convective heat transfer of Al2O3/water nanofluid in a triangular duct under constant wall temperature condition is investigated numerically. Through the investigation the effect of parameters such as nanoparticles diameter, concentration and Reynolds number on nanofluids heat transfer enhancement is studied. Beside the comparison between nanofluid and pure fluid heat transfer is achieved in the present paper. Sometimes because of pressure drop limitations the need for non-circular ducts arises in many heat transfer applications. The low heat transfer rate of non-circular ducts is one the limitations of these systems and using nanofluid instead of pure fluid because of its potential to increase heat transfer of system can compensate this problem. In this paper, for considering the presence of nanoparticles, the dispersion model is used. Numerical results represent an enhancement of heat transfer of fluid with changing to the suspension of nanometer-sized particles in the triangular duct. The results of present model indicate that the nanofluid Nusselt number increases with nanoparticles concentration increasing and diameter decreasing. Also the fluid heat transfer better enhances at high Re in laminar flow by adding nanoparticles.

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