Effects of Wall Speed Ratio and Magnetic Field on MHD Mixed Convection of CuO-Water Nanofluid in a Square Cavity

Résumé fourni par la source

The effect of wall speed ratios on magnetohydrodynamic (MHD) mixed convective flow in a square cavity filled with CuO-water nanofluid, incorporating a diagonally moving heated/cooled wall, is examined. The governing equations, which account for magnetic field effects, buoyancy forces, and nanoparticle concentration, are solved numerically using the finite volume method with the SIMPLE algorithm. The study investigates the effects of wall speed ratios ($\gamma$ = 0, 1, 2), Richardson numbers (Ri = 0.1, 1, 10), Hartmann numbers (Ha = 0, 10, 25, 50), and nanoparticle volume fractions ($\phi$ = 0.0, 0.05) on flow behavior and convective heat transfer within the cavity. The results demonstrate that the wall speed ratio strongly influences streamline patterns and heat transfer. Increasing the wall speed ratio ($\gamma$ = 0--2) enhances heat transfer by up to 476% at low Ri, while nanoparticle addition improves it by 11–18%. In contrast, increasing the Hartmann number (Ha = 0–50) suppresses convection and reduces heat transfer by 8–16% due to magnetic damping. These findings identify optimal wall speed ratios for maximizing thermal performance, highlighting the importance of tailored flow control strategies in MHD nanofluid engineering applications. These findings have significant implications for thermal management design in applications such as heat exchangers, electronic cooling systems, and energy storage devices.

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