Oblique Stagnation Point Flow of Alumina/Gammaalumina Nanofluid with Thermal Radiation

Abstract

This work examines the behavior of Al2O3 ,  Al2O3 nanofluid (NF) in an oblique stagnation point (SP) flow toward a stretching sheet (SS) with porous medium and Cattaneo-Christov (CC) heat flux. In this model, porous medium using Darcy's law with combined effects of sheet stretching dynamics, flow obliqueness, and NF properties are studied. Furthermore, nonlinear thermal radiation (NTR) and velocity slip (VS) are also considered. The governing partial differential equations (PDEs) are converted into ordinary differential equations (ODEs) by similarity transformations. The corresponding equations have been solved numerically using the bvp4c method in MATLAB software. It is examined how parameters like the angle of incidence, NF concentration, and permeability influence the flow characteristics. All the results are illustrated through two dimensional graphs and bar charts. Moreover, streamlines are also presented for oblique stagnation point flow. The main findings highlight how the alumina and gamma-alumina nanoparticles enhance heat transfer and modify the flow behavior near the stagnation point, offering insights for applications in advanced cooling systems and porous media technologies.