The use of nanoparticles with enhanced thermal properties has given nanotechnology a prominent place in modern industrial settings. As opposed to oil or water, which serve as base fluids, nanofluids with superior thermal characteristics, such as thermal diffusion, resistive nature, and increased thermal and electrical conductance, are more effective. This research aims to compare the convective heat transfer in hydromagnetic TiO2-water nanofluid (NF), TiO2-SWCNTs-water hybrid nanofluid (HNF) and TiO2-SWCNTs-MWCNTs-water tri-hybrid nanofluid (THNF) flow in a vertical channel under the influence of hall current. The flow is oscillatory due to the pressure gradient and the velocity slip is considered at the wall. The radiative heat flux is also considered along with the heat source and sink. As a result of using non-dimensional variables, the fundamental equations of the flow problem are recast in a form that is dimension-free. The solution of the dimensionless equations is obtained in the exact form. The effects of involved parameters are illustrated graphically and studied concerning the flow fields, skin friction, and heat transfer rate. The results reveal that the temperature for the tri-hybridized nanofluid is greater than both hybrid and nanofluids. So, three distinct nanoparticle types can be concentrated for improved thermal performance
