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Sheikholeslami M.,Babol Noshirvani University of Technology | Rashidi M.M.,Tongji University | Rashidi M.M.,ENN Group | Ganji D.D.,Babol Noshirvani University of Technology
Journal of Molecular Liquids | Year: 2015

In this paper, the effect of non-uniform magnetic field on nanofluid forced convection heat transfer in a lid driven semi-annulus is studied. The effects of Brownian motion and thermophoresis are taken into account. Control volume based finite element method is used to solve the governing equations in the form of stream function-vorticity formulation. The calculations were performed for different governing parameters namely; the Reynolds number, Lewis number, and Hartmann number. Results show that the Nusselt number has a direct relationship with the Reynolds number while it has a reverse relationship with the Hartmann number and Lewis number. © 2015 Published by Elsevier B.V. Source


Sheikholeslami M.,Babol Noshirvani University of Technology | Rashidi M.M.,Tongji University | Rashidi M.M.,ENN Group
Journal of the Taiwan Institute of Chemical Engineers | Year: 2015

Effect of spatially variable magnetic field on ferrofluid flow and heat transfer is investigated. The enclosure is filled with Fe3O4-water nanofluid. Control volume based finite element method (CVFEM) is applied to solve the governing equations. The combined effects of ferrohydrodynamic and magnetohydrodynamic have been taken into account. The influences of Magnetic number, Hartmann number, Rayleigh number and nanoparticle volume fraction on the flow and heat transfer characteristics have been examined. Results show that enhancement in heat transfer decrease with increase of Rayleigh number while for two other active parameters different behavior is observed. Also it can be concluded that Nusselt number is an increasing function of Magnetic number, Rayleigh number and nanoparticle volume fraction while it is a decreasing function of Hartmann number. © 2015 Taiwan Institute of Chemical Engineers. Source


Sheikholeslami M.,Babol Noshirvani University of Technology | Rashidi M.M.,Tongji University | Rashidi M.M.,ENN Group
Journal of the Brazilian Society of Mechanical Sciences and Engineering | Year: 2016

In this paper, heat and mass transfer of nanofluid in presence of variable magnetic field is investigated. The effects of Brownian motion and thermophoresis are taken into account. Control Volume-based Finite Element Method is applied to solve the governing equations in which both effect of ferrohydrodynamic and magnetohydrodynamic are considered. The effects of Rayleigh number, Hartmann number arising from MHD, buoyancy ratio number and Lewis number on the flow and heat transfer characteristics have been examined. Results are presented in the form of streamline, isotherm, isoconcentration and heatline plots. Results show that Nusselt number has direct relationship with Rayleigh number, buoyancy ratio number and Lewis number while it has reverse relationship with Hartmann number. © 2015, The Brazilian Society of Mechanical Sciences and Engineering. Source


Sheikholeslami M.,Babol Noshirvani University of Technology | Rashidi M.M.,Tongji University | Rashidi M.M.,ENN Group
European Physical Journal Plus | Year: 2015

In this paper, the Control Volume-based Finite Element Method (CVFEM) is applied to simulate Fe3O4 -water nanofluid mixed convection heat transfer in a lid-driven semi annulus in the presence of a non-uniform magnetic field. The calculations were performed for different governing parameters, namely, Richardson number, viscosity parameter, nanoparticle volume fraction, magnetic number and Hartmann number. Results show that the Nusselt number has a direct relationship with Richardson number and nanoparticle volume fraction, while it has a reverse relationship with Hartmann number and magnetic number. Also, it can be found that the Nusselt number increases by considering magnetic-field-dependent viscosity. © 2015, Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg. Source


Garoosi F.,Semnan University | Rohani B.,University of Technology Malaysia | Rashidi M.M.,Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems | Rashidi M.M.,ENN Group
Powder Technology | Year: 2015

Steady state mixed convection heat transfer of nanofluid in a two-sided lid driven cavity with several pairs of heaters and coolers (HACs) inside is investigated numerically using two-phase mixture model. The governing equations have been discretized using the finite volume method while the SIMPLE algorithm has been introduced to couple the velocity-pressure. The influences of volume fraction, diameter and type of the nanoparticles, Richardson number, number of the Heaters and Coolers (HACs), external and internal heating and moving direction of the cavity walls on flow structure, the heat transfer rate and distribution of nanoparticles are investigated. The results of this investigation illustrate that, at low Richardson number by increasing number of the HACs, the heat transfer rate increases. On the other hand, at high Ri, a saturated number of HACs exists which beyond that the value of mean Nusselt number does not changes significantly. In addition, the results reveal that by reducing the diameter of the nanoparticles and Ri, the heat transfer rate increases. It is also observed that at high Richardson numbers, distribution of nanoparticles with dp≥145nm is fairly non-uniform while at low Richardson numbers particle distribution remains almost uniform. Moreover, it is found that by changing direction of the moving walls the heat transfer rate changes significantly. © 2015 Elsevier B.V. Source

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