Influence of the diameter of the magnetic core and surfactant thickness on water carrying iron (iii) oxide ferrofluid flow over a rotating disk

Abstract

Analysis of ferrofluid over a rotating plate is very important in the field of biomedical sciences, electronic devices, and aerodynamics. This work investigates the influence of the diameter of the magnetic core and thickness of the surfactant layer on water-carrying iron(iii) oxide ferrofluid flow and heat transfer over a rotating disk in the presence of a stationary magnetic field. The nonlinear differential equations for velocity and temperature are solved numerically using the finite element procedure. The validation of the present numerical solution is also demonstrated. The non-Newtonian results under the influence of stationary magnetic field for velocity and temperature profiles are compared with the Newtonian results of velocity and temperature profiles in the absence of the magnetic field. Increasing the diameter size of the iron(iii) oxide nanoparticles reduces the velocity and temperature in the flow. However, the thickness of the surfactant layer enhances the velocity and temperature. However, the magnetic field produces the shear thickening in the flow. Enhancement in the diameter of the iron (iii) oxide nanoparticles increases the stress on the disk and local heat transfer, and enhancement in the thickness of the surfactant layer of the nanoparticles reduces the stress and local heat transfer.