Insight into the dynamics of ferrohydrodynamic (FHD) and magnetohydrodynamic (MHD) nanofluids inside a hexagonal cavity in the presence of a non-uniform magnetic field

Ghalambaz, Mohammad; Sabour, Mahmoud; Sazgara, S.; Pop, Ioan; Trâmbiţaş, R.

doi:10.1016/j.jmmm.2019.166024

Cited by 54 publications

(26 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A substantial volume of research works on the magnetohydrodynamic (MHD) thermal convection can be found in Biswas and Manna (2018) and Mondal et al (2019). In a recent work, Ghalambaz et al (2020) have investigated a thermo-fluid flow of nanofluids in a hexagonal enclosure under the influence of a non-uniform magnetic field. Based on their and other earlier analyses, it is revealed that any rise in the magnetic field strength leads to a drop in the heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

Magnetohydrodynamic thermal characteristics of water-based hybrid nanofluid-filled non-Darcian porous wavy enclosure: effect of undulation

Biswas

Mandal²,

Manna

et al. 2021

HFF

View full text Add to dashboard Cite

Purpose The aims of this study is to numerically investigate the thermal phenomena during magnetohydrodynamic (MHD) free convection in an oblique enclosure filled with porous media saturated with Cu–Al2O3/water hybrid nanofluid and heated at the left wavy wall. The thermophysical phenomena are explored thoroughly by varying the amplitude (λ) and undulation (n) of the wavy wall and the inclination of the enclosure (γ) along with other pertinent physical parameters. Darcy–Rayleigh number (Ram), Darcy number (Da), Hartmann number (Ha) and nanoparticle volumetric fraction (ϕ). The effect of all parameters has been analyzed and represented by using heatlines, isotherms, streamlines, average Nusselt number and local Nusselt number. Design/methodology/approach The finite volume method is used to work out the transport equations coupled with velocity, pressure and temperature subjected to non-uniform staggered grid structure after grid-sensitivity analysis by an indigenous computing code and the semi-implicit method for pressure linked equations (SIMPLE) algorithm. The solution process is initiated following an iterative approach through the alternate direction implicit sweep technique and the tridiagonal matrix algorithm (TDMA) algorithm. The iterative process is continued until successive minimization of the residuals (<1e-8) for the governing equations. Findings This study reveals that the increase in the heating surface area does not always favor heat transfer. An increase in the undulation amplitude enhances the heat transfer; however, there is an optimum value of undulation of the wavy wall for this. The heat transfer enhancement because of the wall curvature is revealed at higher Ram, lower Da and Ha and lower volume fraction of nanoparticles. In general, this augmentation is optimum for four undulations of the wavy wall with an amplitude of λ = 0.3. The heat transfer enhancement can be more at the cavity inclination γ = 45°. Research limitations/implications The technique of this investigation could be used in other multiphysical areas involving partial porous layers, conducting objects, different heating conditions, wall motion, etc. Practical implications This study is to address MHD thermo-fluid phenomena of Cu–Al2O3/water-based hybrid nanofluid flow through a non-Darcian porous wavy cavity at different inclinations. The amplitude and number of undulations of the wavy wall, permeability of the porous medium, magnetic field intensity, nanoparticle volumetric fraction and inclinations of the enclosure play a significant role in the heat transfer process. This analysis and the findings of this work can be useful for the design and control of similar thermal systems/devices. Originality/value Many researchers have examined the problem of buoyancy-induced free convection in a wavy-porous cavity packed with regular fluids or nanofluids. However, the effect of magnetic fields along with the amplitude (λ) at different undulations (n) of the heated wavy wall of an inclined enclosure is not attended so far to understand the transport mechanisms. Most often, the evolutions of the thermo-fluid phenomena in such complex geometries invoking different multiphysics are very intricate. Numerical implementations for simulations and subsequent post-processing of the results are also challenging.

show abstract

Section: Introductionmentioning

confidence: 99%

Magnetohydrodynamic thermal characteristics of water-based hybrid nanofluid-filled non-Darcian porous wavy enclosure: effect of undulation

Biswas

Mandal²,

Manna

et al. 2021

HFF

View full text Add to dashboard Cite

show abstract

“…The findings suggested that the lack of a magnetic field increased heat transfer by 2.9%. Ghalambaz et al [24] examined the non-uniform magnetic effects on a nanofluidic stream within a hexagonal chamber and concluded that when the Hartmann number increases, both the heat-mass transit and the Hartmann number decrease. Haq et al [25] demonstrated a nanofluidic stream of CuO and water enclosed inside a trapezoidal compartment with a heated inner trapezoidal barrier.…”

Section: Introductionmentioning

confidence: 99%

MHD Hybrid Nanofluid Mixed Convection Heat Transfer and Entropy Generation in a 3-D Triangular Porous Cavity with Zigzag Wall and Rotating Cylinder

et al. 2022

View full text Add to dashboard Cite

The purpose of this work was to conduct a numerical examination of mixed convective heat transfer in a three-dimensional triangular enclosure with a revolving circular cylinder in the cavity’s center. Numerical simulations of the hybrid Fe3O4/MWCNT-water nanofluid are performed using the finite element approach (FEM). The simulation is carried out for a range of parameter values, including the Darcy number (between 10−5 and 10−2), the Hartmann number (between 0 and 100), the angular speed of the rotation (between −500 and 1000), and the number of zigzags. The stream function, isotherms, and isentropic contours illustrate the impact of many parameters on motion, heat transfer, and entropy formation. The findings indicate that for enhancing the heat transfer rates of hybrid nanofluid in a three-dimensional triangular porous cavity fitted with a rotating cylinder and subjected to a magnetic field, Darcy number > 10−3, Hartmann number < 0, one zigzag on the hot surface, and rotation speed > 500 in flow direction are recommended.

show abstract

“…Basics on the above topics are reported in the literature. [26][27][28][29][30][31] In a recent time, the MHD thermal convective process of nanoliquid has been studied without 32 and with porous domain 33 applying a non-uniform magnetic field. Adopting variable magnetic fields 34 scrutinizes thermo-magnetic convection of hybrid nanoliquid-filled porous enclosure applying variable magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Implementation of partial magnetic fields to magneto-thermal convective systems operated using hybrid-nanoliquid and porous media

Biswas

Mondal

Manna

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

Application of partial magnetic field can be useful for controlling thermal convective processes occurring in magneto-thermal devices/systems. The present work aims to demonstrate the implementation of a partial magnetic field using a typical thermal system. This study explores both local transport phenomena and global heat transfer rates. The partial magnetic fields involving multiphysical conditions find many applications in electronic industries, medical, and health science. The paper presents a conceptual finding from the use of a partial magnetic field on a classical porous cavity comprising Cu−Al2O3/water hybrid nanoliquid heated differentially. The partial magnetic field is functional either horizontally or vertically. The finite volume technique is employed to the coupled transport equations subjected to particular boundary situations using a developed computing code. The simulations are accomplished to a great extent with different variables such as the Darcy-Rayleigh number (Ram), Darcy number (Da), Hartmann number (Ha), and hybrid nanoparticles concentrations ( φ). The effects of magnetic field widths and their positional variations in horizontal and vertical directions are also analyzed. The study found that the convective transport process could effectively be modulated by setting the appropriate position, widths, directions, and intensity of the imposed magnetic fields. The partial magnetic field causes a decrease in heat transfer ∼17.15% or 9.71% less compared to the whole length horizontal or vertical magnetic field. The application of partial magnetic fields significantly alters local thermo-fluid flow phenomena and advancement in heat transfer characteristics in comparison to the magnetic fields acting over the entire domain. Furthermore, the heatline visualization tools reveal the insight of the heat flow dynamics, which dictates the selection of appropriate parametric values and magnetic field configurations.

show abstract

Insight into the dynamics of ferrohydrodynamic (FHD) and magnetohydrodynamic (MHD) nanofluids inside a hexagonal cavity in the presence of a non-uniform magnetic field

Cited by 54 publications

References 33 publications

Magnetohydrodynamic thermal characteristics of water-based hybrid nanofluid-filled non-Darcian porous wavy enclosure: effect of undulation

Magnetohydrodynamic thermal characteristics of water-based hybrid nanofluid-filled non-Darcian porous wavy enclosure: effect of undulation

MHD Hybrid Nanofluid Mixed Convection Heat Transfer and Entropy Generation in a 3-D Triangular Porous Cavity with Zigzag Wall and Rotating Cylinder

Implementation of partial magnetic fields to magneto-thermal convective systems operated using hybrid-nanoliquid and porous media

Contact Info

Product

Resources

About