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首页> 外文期刊>Journal of thermal analysis and calorimetry >Impact of nanoparticles migration on mixed convection and entropy generation of a Al2O3-water nanofluid inside an inclined enclosure with wavy side wall
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Impact of nanoparticles migration on mixed convection and entropy generation of a Al2O3-water nanofluid inside an inclined enclosure with wavy side wall

机译：Impact of nanoparticles migration on mixed convection and entropy generation of a Al2O3-water nanofluid inside an inclined enclosure with wavy side wall

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摘要

A numerical study based on the non-homogeneous model of the mixed convection of Al2O3-water nanofluid in an inclined enclosure is made. The heated side wall of the enclosure is considered to be wavy while the top wall is made to translate horizontally. The wavy physical domain is transformed to a square computational domain through a suitable coordinate transformation. The transformed governing equations are integrated based on the control volume approach in a staggered grid arrangement. A third-order accurate upwind scheme QUICK is used to discretize the convective terms while a central difference type scheme is used to approximate the diffusive terms. The discretized equations along with the specified boundary conditions are solved through a pressure correction-based SIMPLE algorithm. The impact of the inclination angle of the enclosure and surface waviness on the nanofluid mixed convection is elucidated. The parameters governing the Brownian motion, thermophoresis, Lewis number and buoyancy ratio parameter are determined based on the nanofluid thermophysical properties. The effect of the nanoparticle bulk volume fraction and nanoparticle diameter on the mixed convection is analyzed for different choices of nanofluid-to-base fluid thermal buoyancy ratio in the buoyancy-dominated regime as well as shear-dominated regime. A comparison of the non-homogeneous model for the nanofluid with the homogeneous model is also made in this study. The inclination angle of the enclosure is found to have an impact on the mixed convection when buoyancy force is dominant. Heat transfer augmentation occurs as the wave number, and/or wave amplitude of the wavy side wall is increased. The thermodynamic optimization is studied by analyzing the average Nusselt number and the total entropy generation.

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