Magnetic field influence on double-diffusive natural convection in a square cavity – A numerical study

Reddy, N. Keerthi; Murugesan, K.

doi:10.1080/10407782.2016.1277922

Cited by 25 publications

(10 citation statements)

References 38 publications

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“…Doping of nanoparticles in the base fluid essentially modifies the thermo-physical properties of the fluid which influence the flow pattern and heat transport mechanism in a given geometry. Reddy and Murugesan 9,10 analyzed heat and mass transport in square enclosures to understand the effect of aiding and opposing buoyancy forces on heat transfer phenomena while Mohammed et al . 11 and Nath and Krishnan 12 investigated backward facing step (BFS) channel to analyze the behavior of nanofluid on flow separation and re-attachment length under aiding and opposing buoyancy forces.…”

Section: Introductionmentioning

confidence: 99%

Optimization of double diffusive mixed convection in a BFS channel filled with Alumina nanoparticle using Taguchi method and utility concept

Nath

Murugesan

2019

Sci Rep

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This research work focuses on the implementation of Taguchi method and utility concept for optimization of flow, geometrical and thermo-physical parameters for mixed convective heat and mass transfer in a backward facing step (BFS) channel filled with Alumina nanoparticle doped in water-ethylene glycol mixture. Mass, momentum, energy and solutal conservation equations for the flow field are cast in velocity-vorticity form of Navier-Stokes equations, which are solved using Galerkin’s weighted residual finite element method through isoparametric formulation. The following six parameters, expansion ratio of the BFS channel (H/h), Reynolds number (Re), buoyancy ratio (N), nanoparticle volume fraction (χ), shape of nanoparticles and thermal Grashof number (GrT) at three levels are considered as controlling parameters for optimization using Taguchi method. An L27 orthogonal array has been chosen to get the levels of the six parameters for the 27 trial runs. Simulation results were obtained for 27 trial runs from which three different sets of optimum levels of the control parameters were obtained for maximum Nu and Sh and minimum wall shear stress during double diffusive mixed convection in the channel. Then, in order to obtain a single set of optimum levels of the control parameters to achieve maximum heat and mass transfer and minimum wall shear stress concurrently, utility concept has been implemented. Taguchi results indicate that expansion ratio and volume fraction of nanoparticles are the significant contributing parameters to achieve maximum heat and mass transfer and minimum wall shear stress. Utility concept predicts the average Nusselt number less by 2% and Sherwood number less by 3% compared to the Taguchi method with equal weightage of 40% assumed for Nusselt and Sherwood numbers and 20% for wall shear stress.

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Section: Introductionmentioning

confidence: 99%

Optimization of double diffusive mixed convection in a BFS channel filled with Alumina nanoparticle using Taguchi method and utility concept

Nath

Murugesan

2019

Sci Rep

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“…According to the findings, the heat and mass transfer mechanisms and the flow characteristics within the enclosure are substantially influenced by the magnetic field intensity and the amount of heat generated. Employing a velocity-vorticity formulation, Reddy and Murugesan, 2017 [11] examined double-diffusive natural convection in a square cavity with an external magnetic field. The results showed that the increase from 0 to 30 of Ha had reduced Nusselt and Sherwood numbers by around 72 percent and 78 percent, respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of natural convection heat transfer enhancement in a square cavity filled with nanofluid using magnetic effects

Najem¹,

Basher²,

Salman³

2022

QJES

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Researchers in heat transfer are paying close attention to nanofluids because of their potential as high-performance thermal transport media. In light of natural convection's enormous significance, the addition of nanoparticles significantly enhances the thermophysical properties of the nanofluids compared to the base fluid. In this study, experimental work was used to evaluate the influence of CuO nanoparticles on natural convection with magnetohydrodynamic (MHD) flow in a square cavity. The cavity’s left and right vertical walls were maintained at different temperatures, and the top and bottom walls of the cavity were insulated. This experimental study applied a horizontal magnetic field with uniform strength. Results were obtained for a variety of Hartmann numbers ranging from 0–300, Rayleigh numbers going from 2.76E+8 to 6.89E+8, and solid volume fractions ranging from 0 to 1.5%Vol. Results showed that the heat transfer coefficient and Nusselt number values decreased with the increase in the values of the Hartmann number, except for the heat transfer coefficients at Ha=100 and 150 are larger than the heat transfer coefficients at Ha= 0. The maximum heat transfer coefficient and Nusselt number enhancement were 40.8% and 28.5%, respectively, at a 1.5% volume concentration of CuO-water nanofluid, Ra= 6.7E+8 and Ha=100 compared with pure fluid (water) at Ha=0.

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“…The authors have reported that buoyancy ratio has a significant influence on average Nusselt and Sherwood numbers mainly at higher Richardson number. Reddy and Murugesan (2017a, 2017b) analyzed double-diffusive mixed convection in an enclosure, whereas Chen et al (2016) investigated using SiO 2 nanoparticle with different boundary conditions. Very recently, a similar statement was reported by Nath and Krishnan (2019a, 2019b) while performing a numerical experiment on BFS channel using Cu-water nanofluid through using Al 2 O 3 -water/EG nanofluid.…”

Section: Introductionmentioning

confidence: 99%

“…After getting an initial rise followed by a gradual fall in temperature due to heat transfer indicated the drying phenomena. In a square cavity, Reddy and Murugesan (2017a, 2017b) numerically examined mixed convection heat and mass transfer and reported that the magnetic field restricts the effect of convective heat and mass transfer at any buoyancy ratio. Recently, Idowu and Falodun (2020) have conducted an analysis on heat and mass transfer over an inclined plate with uniform magnetic field and water-based nanofluid considering Al 2 O 3 , Cu and Ni nanoparticle and concluded that Nusselt and Sherwood number reduces with magnetic parameter increment.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of double-diffusive mixed convection of Fe₃O₄/Cu/Al₂O₃-water nanofluid flow through a backward-facing-step channel subjected to magnetic field

Nath

Murugesan

2021

HFF

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Purpose This study aims to investigate the buoyancy-induced heat and mass transfer phenomena in a backward-facing-step (BFS) channel subjected to applied magnetic field using different types of nanofluid. Design/methodology/approach Conservation equations of mass, momentum, energy and concentration are used through velocity-vorticity form of Navier–Stokes equations and solved using Galerkin’s weighted residual finite element method. The density variation is handled by Boussinesq approximation caused by thermo-solutal buoyancy forces evolved at the channel bottom wall having high heat and concentration. Simulations were carried out for the variation of Hartmann number (0 to 100), buoyancy ratio (−10 to +10), three types of water-based nanofluid i.e. Fe3O4, Cu, Al2O3 at χ = 6%, Re = 200 and Ri = 0.1. Findings The mutual interaction of magnetic force, inertial force and nature of thermal-solutal buoyancy forces play a significant role in the heat and mass transport phenomena. Results show that the size of the recirculation zone increases at N = 1 for aiding thermo-solutal buoyancy force, whereas the applied magnetic field dampened the fluid-convection process. With an increase in buoyancy ratio, Al2O3 nanoparticle shows a maximum 54% and 67% increase in convective heat and mass transfer, respectively at Ha = 20 followed by Fe3O4 and Cu. However, with increase in Ha the Nuavg and Shavg diminish by maximum 62.33% and 74.56%, respectively, for Fe3O4 nanoparticles at N = 5 followed by Al2O3 and Cu. Originality/value This research study numerically examines the sensitivity of Fe3O4, Cu and Al2O3 nanoparticles in a magnetic field for buoyancy-induced mixed convective heat and mass transfer phenomena in a BFS channel, which was not analyzed earlier.

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Magnetic field influence on double-diffusive natural convection in a square cavity – A numerical study

Cited by 25 publications

References 38 publications

Optimization of double diffusive mixed convection in a BFS channel filled with Alumina nanoparticle using Taguchi method and utility concept

Optimization of double diffusive mixed convection in a BFS channel filled with Alumina nanoparticle using Taguchi method and utility concept

Experimental study of natural convection heat transfer enhancement in a square cavity filled with nanofluid using magnetic effects

Numerical investigation of double-diffusive mixed convection of Fe₃O₄/Cu/Al₂O₃-water nanofluid flow through a backward-facing-step channel subjected to magnetic field

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Magnetic field influence on double-diffusive natural convection in a square cavity – A numerical study

Cited by 25 publications

References 38 publications

Optimization of double diffusive mixed convection in a BFS channel filled with Alumina nanoparticle using Taguchi method and utility concept

Optimization of double diffusive mixed convection in a BFS channel filled with Alumina nanoparticle using Taguchi method and utility concept

Experimental study of natural convection heat transfer enhancement in a square cavity filled with nanofluid using magnetic effects

Numerical investigation of double-diffusive mixed convection of Fe3O4/Cu/Al2O3-water nanofluid flow through a backward-facing-step channel subjected to magnetic field

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Numerical investigation of double-diffusive mixed convection of Fe₃O₄/Cu/Al₂O₃-water nanofluid flow through a backward-facing-step channel subjected to magnetic field