Ferromagnetic and non-magnetic nano-particles in nanofluid flow from a stretching cylinder with magnetic induction: spectral relaxation solution

Beg, OA ORCID: https://orcid.org/0000-0001-5925-6711, Shamshuddin, MD, Ferdows, M, Rezwan, Mr and Kadir, A 2020, Ferromagnetic and non-magnetic nano-particles in nanofluid flow from a stretching cylinder with magnetic induction: spectral relaxation solution , in: 2nd International Conference on Numerical Heat Transfer and Fluid Flow (NHTFF-2020) NIT Warangal, India – Jan 17-19, 2020, 17th-19th January 2020, Department of Mathematics, National Institute of Technology, Warangal, India.

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Abstract

This paper studies the boundary layer flow and heat transfer in an incompressible viscous electrically conducting nanofluid containing ferroparticles or non-magnetic nanoparticles external to a stretching cylinder in the presence of magnetic induction. We consider water as a base fluid embedded with the two types of nanoparticles namely magnetic (Manganese Franklinite (MnZnFe2O4), Ferric Oxide (Fe3O4)) and non-magnetic (Silicon Dioxide (SiO2), Nimonic 80a). The governing non-linear partial differential equations and associated wall and free stream boundary conditions are reduced to a set of non-linear ordinary differential equations with appropriate boundary conditions using similarity transformation. The resulting equations are solved numerically using an efficient, stable, spectral relaxation method (SRM). The SRM code is validated with available solutions in the literature for limiting cases and excellent agreement is achieved. The emerging boundary value problem is shown to be controlled by various magnetic, geometrical and nanoscale parameters. The impact of these parameters on momentum and heat transfer characteristics are visualized graphically and tabulated with comprehensive discussion. The local skin friction and local Nusselt number are also presented graphically. The convergence rates achieved with standard SRM and SRM with SOR (successive over relaxation) are also studied and the latter is observed to achieve faster convergence. The SRM simulations show that with higher values of reciprocal of magnetic Prandtl number (stronger magnetic diffusion relative to viscous diffusion) the boundary layer flow is decelerated whereas the temperature is enhanced (thicker thermal boundary layer). Higher acceleration is attained with non-magnetic nanoparticles (SiO2) whereas the best thermal enhancement is obtained with magnetic nanoparticles (Fe3O4). Substantial acceleration of the flow is also achieved with greater cylinder curvature parameter and enhanced magnetic induction and temperature elevation is also produced.

Item Type: Conference or Workshop Item (Paper)
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Proceedings of the International Conference on Numerical Heat Transfer and Fluid Flow (NHTFF-2020)
Depositing User: OA Beg
Date Deposited: 02 Jan 2020 15:37
Last Modified: 24 Jan 2020 08:32
URI: http://usir.salford.ac.uk/id/eprint/56096

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