Impact of nonlinear radiation on an unsteady magneto hybrid nanofluid flow over an upward/downward rotating disk

Abstract

In this article, we scrutinized the impact of nonlinear thermal radiation and an externally applied magnetic field over a rotating upward or downward disk on an unsteady 3D hybrid nanofluid flow in the presence of SWCNT(single-walled carbon nanotube)+$F{e}_3{O}_4$ (ferrosol ferric oxide) and MWCNT(multi-walled carbon nanotube)+ $F{e}_3{O}_4$ with water as a base fluid. The foremost partial differential equations (PDEs) with boundary conditions of the flow model are converted into ordinary differential equations (ODEs) by considering suitable transformations and then solved numerically by using RKF-45 by implementing a shooting technique. Fluid flow characteristics are explored for various parameters and presented using graphs and charts. The results show that an increase in the radiation parameter causes an upsurge in the thermal field in the fluid flow of MWCNT+$F{e}_3{O}_4$-water/SWCNT+$F{e}_3{O}_4$-water hybrid nanofluid. The thermal profile and axial velocity profile of MWCNT+$F{e}_3{O}_4$ and SWCNT+$F{e}_3{O}_4$ with water-based hybrid nanofluid increase as magnetic parameter values rise but radial and azimuthal velocity profiles decrease. Also, the Nusselt number for $\mathit{MWCNT}+F{e}_3{O}_4$-water hybrid nanofluid is 0.35% less than $\mathit{SWCNT}+F{e}_3{O}_4$-water hybrid nanofluid.

Keywords:

• Hybrid nanofluid
• magnetic field
• nonlinear thermal radiation
• rotating flow

2000 M. S. CLASSIFICATION:

• 76W05

Acknowledgments

The authors are grateful to the respected reviewers for their valuable suggestions for the improvement of the article.