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; Beg, OA

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.

Citation

Salawu, S., Shamshuddin, M., & Beg, O. (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, 115659. https://doi.org/10.1016/j.mseb.2022.115659

• Journal Article Type: Article
• Acceptance Date: Feb 15, 2022
• Online Publication Date: Feb 20, 2022
• Publication Date: May 1, 2022
• Deposit Date: Feb 18, 2022
• Publicly Available Date: Aug 21, 2023
• Journal: Materials Science and Engineering: B
• Print ISSN: 0921-5107
• Publisher: Elsevier
• Volume: 279
• Pages: 115659
• DOI: https://doi.org/10.1016/j.mseb.2022.115659
• Publisher URL: https://doi.org/10.1016/j.mseb.2022.115659
• Related Public URLs: https://www.journals.elsevier.com/materials-science-and-engineering-b