Enhanced thermal transport dynamics in MHD ferro nanofluids through a wavy geometry under Arrhenius kinetics: Role of nanoparticles morphology

Controlling activation energy-driven transport processes is critical in applications such as catalytic reactors, energy storage systems, and chemical sensing devices. The aim of the present study is to investigate the Arrhenius activation energy behaviour of heat and mass transfer of nanofluid through an asymmetric wavy channel. Ferro nanoparticles of various radius and interparticle spacing are investigate by considering water a base fluid. The goal of the study is to analyse the effect of activation energy for various radius and interparticle spacing. The governing equations of the dynamic nanofluid systems are transformed into a set of coupled nonlinear partial differential equations through suitable dimensionless transformations and solved numerically with the Crank–Nicolson scheme. The results reveal that smaller nanoparticle radii and wider interparticle spacing enhance velocity, temperature, and wall shear stress, whereas larger particles and closer spacing reduce flow and heat transfer due to agglomeration effects. Thermal radiation increases fluid temperature, while stronger magnetic fields suppress velocity because of Lorentz drag. Higher activation energy decreases the Sherwood number, indicating reduced mass transfer caused by slower reaction kinetics. These findings highlight that nanoparticle geometry and activation energy can be effectively tuned to control heat and mass transport characteristics in nanofluid-based systems.