Influence of magnetization, variable viscosity and thermal conductivity on Von Karman swirling flow of H2O-FE3O4 and H2O-MN-ZNFe2O4 ferromagnetic nanofluids from a spinning disk : smart spin coating simulation

Salawu, SO, Shamshuddin, M and Beg, OA ORCID: https://orcid.org/0000-0001-5925-6711 2022, 'Influence of magnetization, variable viscosity and thermal conductivity on Von Karman swirling flow of H2O-FE3O4 and H2O-MN-ZNFe2O4 ferromagnetic nanofluids from a spinning disk : smart spin coating simulation' , Materials Science and Engineering: B, 279 , p. 115659.

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Abstract

Motivated by smart (functional) nano-ferromagnetic spin coating applications, a theoretical study is described for steady swirling Von Karman thermo-magnetic water-based flowing nanoliquids containing ferromagnetic nanoparticles from a rotating disk in Darcian permeable media. The Odenbach formulation is deployed for magnetic field-dependent viscosity and the Hooman-Gurgenci model is used for variable thermal conductivity. The governing mass, momentum and temperature equations are converted into nonlinear-coupled ordinary derivative momentum and energy equations via appropriate similarity transformations with appropriate boundary conditions. A nanoscale Tiwari-Das formulation is deployed for the fractional volume nanoparticle effects. The resulting boundary value ordinary differential problem is solved by a Galerkin weighted residual method (GWRM) along with Simpson’s one-third rule. Verification of the GWRM solutions is achieved with numerical shooting quadrature (MAPLE) and very good correlation is demonstrated. Ferromagnetic Fe3O4 nanofluid is observed to achieve superior thermal conductivity enhancement relative to ferromagnetic MnZnFe2O4 nanofluid. Increasing permeability parameter (K ) enhances axial, radial and tangential velocity magnitudes and, in all cases, the Fe3O4 -water ferromagnetic nanofluid achieves greater values than the MnZnFe2O4 -water ferromagnetic nanofluid, in particular at intermediate distances from the disk surface (axial coordinate). Increasing magnetic field intensity ( ) substantially modifies the viscosity and produces a consistent retardation in both axial and radial velocity whereas it weakly enhances the tangential velocity field. With greater ferromagnetic interaction number ( ) axial velocity is enhanced strongly, and radial velocity is also boosted. However tangential velocity is slightly reduced, and temperature is strongly suppressed for both ferromagnetic nanofluids.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Materials Science and Engineering: B
Publisher: Elsevier
ISSN: 0921-5107
Related URLs:
Depositing User: OA Beg
Date Deposited: 18 Feb 2022 14:22
Last Modified: 02 Mar 2022 10:15
URI: https://usir.salford.ac.uk/id/eprint/63221

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