Computation of micropolar nanofluid from a wedge with heterogeneous carbon/metallic nanoparticles, viscous dissipation and heat sink/source: rheological nanocoating flow simulation

Umavathi, J. C.; Kumar, Mahesh Ashok; Anwar Bég, O

Abstract

Motivated by nanotechnological coating applications, a theoretical study is presented for the laminar, steady-state, incompressible nonlinear boundary layer flow of a non-Newtonian nanofluid external to a wedge-shaped configuration. The wedge surface is assumed to be isothermal. The Eringen micropolar model is deployed for rheological properties of the nanofluid. A Tiwari-Das nanoscale formulation is utilized in order to study specific nanoparticles and volume fraction effects. The dimensionless, transformed, coupled momentum, angular momentum (micro-rotation) and thermal perimeter layer equations are solved with the efficient MATLAB bvp4c numerical scheme. Validation with earlier studies is conducted. Aqueous-based nano-polymers are examined with either metallic/metallic oxide (copper, silver, titania) or carbon-based (diamond) nanoparticles. The influence of Hartree pressure gradient parameter () m , Eringen vortex viscosity (micropolar) parameter () K , nanoparticle volume fraction ()  , heat absorption (sink) parameter ()  , Prandtl number () Pr and nanoparticle type on velocity () F  , angular velocity () H , temperature ()  , skin friction function and Nusselt number function are visualized graphically and in tables. Temperature is strongly elevated with increasing micropolar parameter and nanoparticle volume fraction. Angular velocity (micro-rotation) is damped near the wedge surface with increment in volume fraction but further from the wall the reverse effect is observed. Velocity is boosted with increasing nanoparticle volume fraction. Temperatures are elevated with heat source (generation) but suppressed with heat sink 2 (absorption). Increasing Eckert number (dissipation) strongly enhances temperature and thermal boundary layer thickness. Temperatures are a maximum for silver and progressively lower for copper, diamond and with a minimum for titania. Skin friction is boosted with pressure gradient parameter whereas Nusselt number is depleted. Nusselt number is observed to be a maximum for diamond whereas it is a minimum for silver.

Citation

Umavathi, J. C., Kumar, M. A., & Anwar Bég, O. (in press). Computation of micropolar nanofluid from a wedge with heterogeneous carbon/metallic nanoparticles, viscous dissipation and heat sink/source: rheological nanocoating flow simulation. International Journal of Modelling and Simulation, 1-17. https://doi.org/10.1080/02286203.2023.2237846

• Journal Article Type: Article
• Acceptance Date: Jul 14, 2023
• Online Publication Date: Jul 25, 2023
• Deposit Date: Jul 15, 2023
• Publicly Available Date: Jul 26, 2024
• Journal: International Journal of Modelling and Simulation
• Print ISSN: 0228-6203
• Publisher: Taylor and Francis
• Peer Reviewed: Peer Reviewed
• Pages: 1-17
• DOI: https://doi.org/10.1080/02286203.2023.2237846
• Keywords: Electrical and Electronic Engineering, Hardware and Architecture, Mechanics of Materials, Modeling and Simulation, Software
• Publisher URL: https://www.tandfonline.com/journals/TJMS