CNTs effect on micropolar hybrid ferrofluid flow over a shrinking wall with magnetic dipole effect

In the present work, ferrofluid flow attributes in water-ethylene glycol hybrid fluid containing cathode nanotubes (CNTs) past a shrinking plate considering the magnetic dipole effect have been studied. The thermal radiation effect and the effect of source/sink have also been examined in the model developed. The formulated equations are nondimensionalized into ODEs by relevant similarity approach, and the resultant highly nonlinear coupled system is solved numerically using an effective shooting approach. Comparison results agree with previously published works in the literature. The characteristic of the affecting physical parameters on velocity profile f'(ζ), micropolar rotation profile φ(ζ) , temperature profiles and θ₁(ζ), drag coefficient θ₂(ζ), and the reduced Nusselt number √1/Re Nu are demonstrated through graphs and are discussed. Numerically calculated values of √ Cf and √1/Re Nu are also recorded in the tables. Dual solutions and the critical values of shrinking parameter χ and suction/injection parameter s for the flow problem considering the magnetic dipole effect have been found. The significant outcome of the flow problem discussed is that an adequate quantity of suction is required for the flow to be achievable over a shrinking surface. SWCNTs hybrid ferrofluid is a better heat transfer fluid than MWCNTs hybrid ferrofluid, having a wider range of both s and χ for feasible flow. (author)