Nanoparticles migration due to thermophoresis and Brownian motion and its impact on Ag-MgO/Water hybrid nanofluid natural convection

The present study aims to investigate the impact of nanoparticle migration due to Brownian motion and thermophoresis on Ag-MgO/Water hybrid nanofluid natural convection. An enclosure with sinusoidal wavy walls is considered for this investigation; right and cold walls of this enclosure are in constant temperature while the upper and bottom walls are insulated. This simulation follows Buongiorno's mathematical model; Brownian and thermophoresis diffusion of Ag occurs in MgO-Water nanofluid while the diffusion of MgO happens in Ag-water nanofluid. The result indicates that Nu number increments up to 11% by increasing thermophoresis diffusion for both nanoparticles. Also, increasing Brownian diffusion of Ag augments nanoparticle concentration on hot wall, while the accumulation of nanoparticles unifies by incrementing Brownian diffusion of MgO. [Display omitted] •Ag − MgO/water hybrid nanofluid utilizing Buongiorno's mathematical model.•Nanoparticle accumulates better on the cold wall due to thermophoresis migration.•Nu number increments up to 11% by increasing thermophoresis diffusion.•The accumulation of nanoparticles unifies by augmenting DBMgO.