Dual solutions for mixed convection flow of SiO2-Al2O3/water hybrid nanofluid near the stagnation point over a curved surface

The major focus of this work is to examine the results of steady mixed convection flow of SiO2-Al2O3/water hybrid nanofluid near the stagnation point with the curved surface of radius R and mass suction S. Hybrid nanofluid is taken into consideration by suspending a couple of distinct nanoparticles (SiO2 and Al2O3) into pure water. Depending on similarity variables, the governing equations with associated boundary conditions are modified to formulate a normalized boundary value problem of coupled differential equations and the MATLAB problem solver bvp4c is efficient to resolve the resulting problem. From this study it is determined that the skin friction coefficient and local Nusselt number of hybrid nanofluid improves with high values of mass suction and nanoparticles concentration while increasing curvature K declines the skin friction coefficient and gives rise to a poor performance of heat transfer. Moreover, the improvement of thermal boundary layer and velocity boundary layer take place with powerful concentration of SiO2 and Al2O3 and greater values of curvature K. Some interesting results for the flat sheet (K -> infinity) were also computed. (C) 2020 Elsevier B.V. All rights reserved.