Numerical and statistical analysis on unsteady magnetohydrodynamic convection in a semi-circular enclosure filled with ferrofluid

Rahman, M. M.; Mojumder, Satyajit; Saha, Sourav; Joarder, Anwar H.; Saidur, R.; Naim, Abdul Ghani

doi:10.1016/j.ijheatmasstransfer.2015.06.021

Cited by 30 publications

(6 citation statements)

References 45 publications

(48 reference statements)

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“…Besides, the in uence of induced magnetic eld on ferrite nanoparticles and vis versa could be neglected with respect to the small value of assumed magnetic Reynolds number. A similar trend was utilized before by Sheikholeslami & Ganji [10] and Rahman et al [8]. However, there is no electric eld applied to the ow.…”

Section: Problem De Nition and Mathematical Formulationmentioning

confidence: 63%

“…Fe 3 O 4 , cobalt, and nickel nanoparticles are commonly used for this purpose and cobalt-kerosene ferro uid has better heat transfer characteristics than the others. This ferro uid is less costly and environmentally friendly [8]. However, one of the popular techniques to control convective ow elds of uid systems containing nano uid or ferro uid is applying an external magnetic eld.…”

Section: Introductionmentioning

confidence: 99%

“…Magnetohydrodynamic (MHD) convection of nano uids/ferro uids has received much attention during the recent years due to its importance in micro-electronic devices, cooling of nuclear reactors, puri cation of molten metals, design of MHD pumps and accelerators, and many others [7]. Rahman et al utilized statistical and numerical techniques to study unsteady MHD convection of cobalt-kerosene ferro uid in a semicircularshaped enclosure [8]. They found that the higher solid volume fraction of ferroparticles in a base uid su ciently improved its thermo-physical properties.…”

Section: Introductionmentioning

confidence: 99%

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Effect of alternating magnetic field on unsteady MHD mixed convection and entropy generation of ferro fluid in a linearly heated two-sided cavity

Ghaffarpasand

2017

Scientia Iranica

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This work considers the numerical study of unsteady MHD convection of cobalt-kerosene ferro uid in a linearly heated two-sided cavity and in the presence of constant and alternating magnetic elds. An accurate nite volume method is adapted to solve the governing equations for this problem. The uid ow and heat transfer characteristics are studied for a wide range of Richardson numbers (0:01 Ri 10) and Hartmann numbers (0 Ha 100). The volumetric fraction of nanoscale ferromagnetic particles in ferro uid also varies between 0:0 0:2, while the size of those nanoparticles is xed at 45 nm. In addition, di erent alternating magnetic elds with various periods and phase deviations are utilized to study the e ect of time-periodic magnetic eld on the ow characteristics and heat transfer. The entropy generation and Bejan number are also evaluated to study the e ect of key parameters and temporal variation of magnetic eld on various uid irreversibilities. The results show that applying time-periodic magnetic eld has remarkably in uenced the uid characteristics, the uid irreversibilities, and heat transfer within the cavity. Meanwhile, the in uence of phase deviation on heat transfer seems to be insigni cant.

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Section: Problem De Nition and Mathematical Formulationmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of alternating magnetic field on unsteady MHD mixed convection and entropy generation of ferro fluid in a linearly heated two-sided cavity

Ghaffarpasand

2017

Scientia Iranica

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“…This study predicts that the Rayleigh number enhances heat transfer whereas decreases with a higher Hartmann number. Rahman et al [26] investigated time-dependent MHD convection using Cobalt–kerosene ferrofluid within a semi-circular cavity employing finite element analysis.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling of unsteady flow with uniform/non-uniform temperature and magnetic intensity in a half-moon shaped domain

Islam

Parveen

Nasrin

2022

Heliyon

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“…They also pointed that the backward heat transfer and flow pattern shares the same period. Rahman et al (2015) studied unsteady MHD convection in a semicircular-shaped enclosure filled with cobalt-kerosene ferrofluid. It was found that there exists a strong interaction between cobalt and base fluid in the presence of magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann simulation of transient natural convection of air in square cavity under a magnetic quadrupole field

Xie

Yao

et al. 2016

HFF

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Purpose The purpose of this paper is to apply the lattice Boltzmann method (LBM) with multiple distribution functions model, to simulate transient natural convection of air in a two-dimensional square cavity in the presence of a magnetic quadrupole field, under non-gravitational as well as gravitational conditions. Design/methodology/approach The density-temperature double distribution functions and D2Q9 model of LBM for the momentum and temperature equations are currently employed. Detailed transient structures of the flow and isotherms at unsteady state are obtained and compared for a range of magnetic force numbers from 1 to 100. Characteristics of the natural convection at initial moment, quasi-steady state and steady state are presented in present work. Findings At initial time, effects of the magnetic field and gravity are both relatively limited, but the effects become efficient as time evolves. Bi-cellular flow structures are obtained under non-gravitational condition, while the flow presents a single vortex structure at first under gravitational condition, and then emerges a bi-cellular structure with the increase of magnetic field force number. The average Nusselt number generally increases with the augment of magnetic field intensity. Practical implications This paper will be useful in the researches on crystal material and protein growth, oxygen concentration sensor, enhancement or suppression of the heat transfer in micro-electronics and micro-processing technology, etc. Originality/value The current study extended the application of LBM on the transient natural convective problem of paramagnetic fluids in the presence of an inhomogeneous magnetic field.

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Numerical and statistical analysis on unsteady magnetohydrodynamic convection in a semi-circular enclosure filled with ferrofluid

Cited by 30 publications

References 45 publications

Effect of alternating magnetic field on unsteady MHD mixed convection and entropy generation of ferro fluid in a linearly heated two-sided cavity

Effect of alternating magnetic field on unsteady MHD mixed convection and entropy generation of ferro fluid in a linearly heated two-sided cavity

Mathematical modeling of unsteady flow with uniform/non-uniform temperature and magnetic intensity in a half-moon shaped domain

Lattice Boltzmann simulation of transient natural convection of air in square cavity under a magnetic quadrupole field

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