Convective heat transfer can be enhanced passively by changing flow geometry and boundary conditions or by improving the\r\nthermal conductivity of the working fluid, for example, introducing suspended small solid nanoparticles. In this paper, a numerical\r\ninvestigation on laminar mixed convection in a water-Al2O3-based nanofluid, flowing in a triangular cross-sectioned duct, is\r\npresented. The duct walls are assumed at uniform temperature, and the single-phase model has been employed in order to analyze\r\nthe nanofluid behaviour. The hydraulic diameter is equal to 0.01 m. A fluid flow with different values of Richardson number\r\nand nanoparticle volume fractions has been considered. Results show the increase of average convective heat transfer coefficient\r\nand Nusselt number for increasing values of Richardson number and particle concentration. However, also wall shear stress and\r\nrequired pumping power profiles grow significantly.
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