CVFEM analysis for Fe3O4–H2O nanofluid in an annulus subject to thermal radiation

• Published in: International journal of heat and mass transfer Vol. 132; pp. 473 - 483
• Main Authors: Dogonchi, A.S., Waqas, M., Seyyedi, S.M., Hashemi-Tilehnoee, M., Ganji, D.D.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.04.2019; Elsevier BV
• Subjects: [formula omitted] nanofluid; Annuli; Cancer; Computational fluid dynamics; Computer simulation; CVFEM; Drug delivery systems; Energy storage; Fluid flow; Friction reduction; Hartmann number; Iron oxides; Magnetic field; Mathematical models; Nanofluids; Nanoparticles; Nusselt number; Parameters; Thermal engineering; Thermal radiation; Transportation; Fe3O4–H2O nanofluid; Thermal radiation; CVFEM; Magnetic field
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/j.ijheatmasstransfer.2018.11.124

•CVFEM is employed to simulate the nanofluid natural convection in an annulus.•Thermal radiation and magnetohydrodynamics are taken into consideration.•A correlation for average Nusselt number is established in terms of energetic parameters.•Average Nusselt number decays via larger Hartman number. Colloidal nanoparticles suspensions (nanofluids) are the materials of consideration for thermal engineering due to their typically enhanced heat transportation characteristics in comparison to base liquid. Nanoliquids have utilizations in transportation, solar absorption, nuclear systems chilling, friction reduction and energy storage etc. Besides, magnetic nanoliquids are utilized in the cancer therapeutics via implementation of drug delivery and cancer imaging. Thus, in view of such utilizations, here modeling and simulations are presented to scrutinize the natural convective Fe3O4-water nanoliquid flow in an annulus between a triangle and a rhombus enclosures. Thermal radiation aspect is considered for formulation. CVFEM is implemented for computations of numerical outcomes. Impacts of embedding variables on the flow and heat transfer features have been perused. Furthermore a correlation for average Nusselt number is established in terms of energetic parameters. The obtained results portray that average Nusselt number rises subjected to Rayleigh number, radiation parameter and volume fraction of nanofluid while it diminishes when Hartmann number is increased.