Magnetic Field Effect on Mixed Convection in Lid-Driven Trapezoidal Cavities Filled With a Cu–Water Nanofluid With an Aiding or Opposing Side Wall

Chamkha, Ali J.; Ismael, Muneer A.

doi:10.1115/1.4033211

Cited by 45 publications

(8 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They found that side angles have a significant impact on the heat transfer when forced convection dominates; whereas a negligible effect during natural convection mode is observed. In another study, Chamkha and Ismael (2016) studied the dampening effect of magnetic fields on thermal behavior. Mixed convection under the double-diffusion of air (Pr = 0.7) filled right-angled trapezoidal enclosure (with inward side angles of 45º and 60º) heated partially has been investigated by Ababaei et al (2018) and observed that heat and mass transfer were significantly affected by the side angle as well as flow control parameters.…”

Section: Introductionmentioning

confidence: 99%

Hybrid nanofluid magnetohydrodynamic mixed convection in a novel W-shaped porous system

Mandal¹,

Biswas

Manna

et al. 2022

HFF

View full text Add to dashboard Cite

Purpose This study aims to numerically examine the influence of various geometric parameters of a novel W-shaped porous cavity undergoing hybrid nanofluid-based magnetohydrodynamic mixed convection. The W-shaped cavity is modified from the classical trapezoidal cavity by constructing a triangular shape at its bottom. This cavity is isothermally active at the bottom, with different numbers and heights of the triangular peak (or undulation). The heated hybrid nanofluid (Cu–Al2O3–H2O) flow is cooled through the translating top wall. Inclined sidewalls are thermally insulated. To compare the impacts of change in geometric parameters, a square cavity under similar boundary conditions is also simulated. This study is carried out systematically addressing the various influences from a range of parameters like side angles (γ), number (m) and height (λ) of the bottom undulation, Reynolds number (Re), Richardson number (Ri), Darcy number (Da), Hartmann number (Ha), hybrid nanoparticles volume fraction (φ) on the overall thermal performance of the cavity. Design/methodology/approach Applying the finite volume approach, the transport equations involving multiphysical conditions like porous substance, hybrid nanofluid, magnetic field and shearing force are solved numerically by using a written FORTRAN-based code following the SIMPLE algorithm. The algebraic equations are solved over all the control volumes in an iterative process using the alternate direction implicit scheme and the tri-diagonal matrix algorithm. The converged solution of the iterative process is obtained when the relative error levels satisfy the convergence criterion of 10–8 and 10–10 for the maximum residuals and the mass defect, respectively. Findings It is revealed that an increase in the bottom undulation height always improves the thermal energy transfer despite the reduction of fluid volume. Thermal energy transfer significantly depends on the heating and cooling surface lengths, fluid volume in the cavity and the magnitude of the bottom undulation height of the W-shaped cavity. With the increase in bottom undulation height, effective heating length increases by ∼28%, which leads to a ∼15% reduction in the effective volume of the working fluid and a gain in heat transfer by ∼56.48%. In general, the overall thermal energy transport is improved by increasing Re, Ri and Da; whereas it is suppressed by increasing Ha. Research limitations/implications There are many opportunities for future research experimentally or numerically, considering different curvature effects, orientations of the geometry, working fluids, boundary conditions, etc. Furthermore, this study could be extended by considering unsteady flow or turbulent flow. Practical implications In many modern systems/processes pertaining to materials processing, continuous casting, food processing, chemical reactors, biomedical applications, etc. fine control in the transport process is a major concern. The findings of this analysis can effectively be useful for other applications for getting more control features in terms of achieving the operational objectives. The approach of the system analysis (considering geometrical size parameters to delve into the underlying transport physics) and the obtained simulated results presented in the work can usefully be applicable to similar thermal systems/devices such as materials processing, thermal mixing, chemical reactors, heat exchangers, etc. Originality/value From the well-documented and vast pool of literature survey, it is understood that there exists no such investigation on the considered geometry and study. This study contributes a lot to understanding magnetic field moderated thermofluid flow of a hybrid nanofluid in a porous medium filled W-shaped cavity, in consideration of different geometrical shape parameters (undulation peak numbers at bottom wall, peak heights, side angles and heating and cooling length). Findings brought by this study provide great insights into the design and operation under various ranges of multiphysical thermofluid-flow processing phenomena.

show abstract

Section: Introductionmentioning

confidence: 99%

Hybrid nanofluid magnetohydrodynamic mixed convection in a novel W-shaped porous system

Mandal¹,

Biswas

Manna

et al. 2022

HFF

View full text Add to dashboard Cite

show abstract

“…It did note that the features of heat transfer and fluid flow inside the cavities were entirely conditional on Reynolds and Grashof numbers. Chamkha and Ismael 13 explored the mixed convection of the right heat-inclined sidewall within a lid-driven nanofluid-filled trapezoidal cavity with the impact of the uniform magnetic field. The authors showed that the Nusselt number’s action varies from the Richardson number associated with the lid’s direction.…”

Section: Introductionmentioning

confidence: 99%

Entropy production and mixed convection within trapezoidal cavity having nanofluids and localised solid cylinder

Ishak

Alsabery

Hashim

et al. 2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

The entropy production and mixed convection within a trapezoidal nanofluid-filled cavity having a localised solid cylinder is numerically examined using the finite element technique. The top horizontal surface moving at a uniform velocity is kept at a cold temperature, while the bottom horizontal surface is thermally activated. The remaining surfaces are maintained adiabatic. Water-based nanofluids ($$\text {Al}_2\text {O}_3$$ Al 2 O 3 nanoparticles) are used in this study, and the Boussinesq approximation applies. The influence of the Reynolds number, Richardson number, nanoparticles volume fraction, dimensionless radius and location of the solid cylinder on the streamlines, isotherms and isentropic are examined. The results show that the solid cylinder’s size and location are significant control parameters for optimising the heat transfer and the Bejan number inside the trapezoidal cavity. Furthermore, the maximum average Nusselt numbers are obtained for high R values, where the average Nusselt number is increased by 30% when R is raised from 0 to 0.25.

show abstract

“…For controlling and enhancement of the convection heat transfer, a liddriven wall is used [7][8][9][10][11][12][13][14] and a rotating cylinder used inside the enclosures [15]. When using Rayleigh number 1-1400 show the influence of the rotating cylinder to increasing thermal transfer by Lewis [16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Mixed Convection on a Rotating Circular Cylinder in a Cavity Filled With Nanofluid and Porous Media

Abdulsahib

Al‐Farhany

2020

QJES

View full text Add to dashboard Cite

The present study, experimentally investigated the mixed convection in a square enclosure partitioned in two layers. The experiments were performed with Al2O3–water nanofluid (upper layer) and superposed porous medium (lower layer) with an adiabatic rotating cylinder at the center of the cavity. The boundary conditions of the experimental study were; the upper and lower walls were assumed adiabatic, the right wall was heated, and the left wall was cooled. Experimentally, 15 K-type thermocouples and thermal imaging camera were employed to measure the temperatures distribution inside the cavity when the concentration of nanoparticles (ɸ = 0.06), the temperature difference (∆T) between the cold and hot walls was (6, 8, and 10) °C, and angular rotational velocity (-50, -25, 0, 25, and 50) rpm. The results of experimental data showed that in general, the distribution of temperatures was very well along the upper half of the enclosure, while in the lower half the temperature distribution was confined near the hot wall region. When the circular cylinder rotates in counter-clockwise, it noted that the effect of speed is evident in the downside of the cylinder, while the temperature distribution in the left upper part of the enclosure decreasing. When the circular cylinder rotates in the clockwise direction, the results showed that the effect of cylinder rotation was around cylinder only. Moreover, the results demonstrated that the increasing temperature difference leads to a noticeable increment in the intensity of the flow.

show abstract

Magnetic Field Effect on Mixed Convection in Lid-Driven Trapezoidal Cavities Filled With a Cu–Water Nanofluid With an Aiding or Opposing Side Wall

Cited by 45 publications

References 40 publications

Hybrid nanofluid magnetohydrodynamic mixed convection in a novel W-shaped porous system

Hybrid nanofluid magnetohydrodynamic mixed convection in a novel W-shaped porous system

Entropy production and mixed convection within trapezoidal cavity having nanofluids and localised solid cylinder

Experimental Investigation of Mixed Convection on a Rotating Circular Cylinder in a Cavity Filled With Nanofluid and Porous Media

Contact Info

Product

Resources

About