<p>This study investigates the behavior of aggregated titanium oxide nanoparticles in an ethylene glycol (EG) base fluid within the boundary layer region of a Reiner–Philippoff non-Newtonian fluid, flowing over a curved stretching surface. The flow is exposed to a radially uniform magnetic field through a porous structure. The Reiner–Philippoff model is used because it is suitable when dealing with shear-thinning and shear-thickening fluids. The pertinent boundary layer equations for flow and heat transfer are derived and subsequently transformed into dimensionless partial differential equations (PDEs) via suitable non-similarity transformations. The non-similar dimensionless PDEs are solved numerically using the local non-similarity technique where a second level of truncation is used. Skin friction coefficient and Nusselt number solutions of leading parameters are calculated for the drag force and the heat transfer coefficients for the interfaces of the accumulator nanofluid and the curved stretching sheet. Graphical results reveal that nanoparticle aggregation has a significant impact on skin friction and Nusselt number when compared to the non-aggregated nanofluid. This study underscores the potential for optimizing the flow and thermal performance of non-Newtonian fluids in engineering applications by utilizing the aggregated nanoparticles.</p>