Mazandaran Institute of Technology

Bābol, Iran

Mazandaran Institute of Technology

Bābol, Iran

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Sheikholeslami M.,Mazandaran Institute of Technology | Sheikholeslami M.,Babol Noshirvani University of Technology | Gorji Bandpy M.,Mazandaran Institute of Technology | Gorji Bandpy M.,Babol Noshirvani University of Technology | And 3 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2014

In this study magnetohydrodynamic effect on natural convection heat transfer of Cu-water nanofluid in an enclosure with hot elliptic cylinder is investigated. The governing equations of fluid motion and heat transfer in their vorticity stream function form are used to simulate the nanofluid flow and heat transfer. Control Volume based Finite Element Method (CVFEM) is applied to solve these equations. The effective thermal conductivity and viscosity of nanofluid are calculated using the Maxwell-Garnetts (MG) and Brinkman models, respectively. The calculations are performed for different governing parameters such as the Hartmann number, Rayleigh number, nanoparticle volume fraction and inclined angle of inner cylinder. Also a correlation of average Nusselt number corresponding to active parameters is presented. The results indicate that Nusselt number is an increasing function of nanoparticle volume fraction, Rayleigh numbers and inclination angle while it is a decreasing function of Hartmann number. Also it can be found that increasing Rayleigh number leads to decrease heat transfer enhancement while opposite trend is observed with augment of Hartmann number. © 2013 Elsevier B.V.


Dogonchi A.S.,Mazandaran Institute of Technology | Hatami M.,Esfarayen University of Technology | Domairry G.,Babol Noshirvani University of Technology
Powder Technology | Year: 2015

In this article, the motion of a spherical particle in a plane Couette Newtonian fluid flow is studied. The governing equations of a spherical solid particle's motion in the plane Couette fluid flow are investigated using the Differential Transformation Method (DTM) and a Padé approximant which are an analytical solution technique. For validation of the analytical solution, the governing equation is solved numerically. The horizontal and vertical velocities of spherical solid particle are shown for different fluids and values of the embedding parameters. The DTM-Padé results indicate that the horizontal and vertical velocities of spherical solid particle in water fluid are higher than the glycerin and ethylene-glycol fluids. Also the horizontal and vertical velocities increase with an increase in the particle radius. Comparison of the results (DTM and numerical) was shown that the analytical method and numerical data are in a good agreement with each other. © 2015 Elsevier B.V.


Sheikholeslami M.,University of Mazandaran | Sheikholeslami M.,Babol Noshirvani University of Technology | Sheikholeslami M.,Mazandaran Institute of Technology | Gorji-Bandpy M.,Babol Noshirvani University of Technology | And 3 more authors.
Journal of Molecular Liquids | Year: 2014

In this study, free convection heat transfer in an enclosure filled with nanofluid is investigated. The important effects of Brownian motion and thermophoresis have been included in the model of nanofluid. Control volume based finite element method is used to solve the governing equations. Effects of angle of turn, buoyancy ratio number and Lewis number on streamline, isotherm and isoconcentration are considered. Also a correlation for Nusselt number corresponding to active parameters is presented. Results indicated that Nusselt number is an increasing function of buoyancy ratio number while it is a decreasing function of Lewis number and angle of turn. Also it can be found that Lewis number has no significant effect on Nusselt number at low values of buoyancy ratio number. © 2014 Elsevier B.V.


Sheikholeslami M.,Babol Noshirvani University of Technology | Sheikholeslami M.,University of Mazandaran | Sheikholeslami M.,Mazandaran Institute of Technology | Gorji-Bandpy M.,Babol Noshirvani University of Technology | And 3 more authors.
Journal of Molecular Liquids | Year: 2014

In this paper, effect of magnetic field on free convection heat transfer in an enclosure filled with nanofluid is studied. KKL (Koo-Kleinstreuer-Li) correlation is used for simulating effective thermal conductivity and viscosity of nanofluid. The inner cylinder is maintained at uniform heat flux and the outer cylinder has constant temperature. The governing equations are solved via Control Volume based Finite Element Method. The heat transfer between cold and hot regions of the enclosure cannot be well understood by using isotherm patterns so heatline visualization technique is used to find the direction and intensity of heat transfer in a domain. Effect of Hartmann number, volume fraction of nanoparticle, Rayleigh number and aspect ratio on streamline, isotherm and heatline are examined. The results show that as Hartmann number increases Nusselt number decreases while opposite trend is observed as nanoparticles volume fraction, Rayleigh number and aspect ratio increase. Domination of conduction mechanism causes heat transfer enhancement to increase. So enhancement in heat transfer increases with increase of Hartmann number and aspect ratio while it decreases with augment of Rayleigh number. © 2013 Published by Elsevier B.V.


Sheikholeslami M.,University of Mazandaran | Sheikholeslami M.,Babol Noshirvani University of Technology | Sheikholeslami M.,Mazandaran Institute of Technology | Gorji-Bandpy M.,Babol Noshirvani University of Technology | And 2 more authors.
Powder Technology | Year: 2014

Lattice Boltzmann method is used to investigate magnetohydrodynamic flow utilizing Cu-water nanofluid in a concentric annulus. This investigation was compared with other numerical methods and found to be in excellent agreement. Numerical results for flow and heat transfer characteristics are obtained for various values of Hartmann number (Ha=0 to 40), nanoparticle volume fraction (φ=0, 0.02, 0.04 and 0.06), Rayleigh number (Ra=104,105 and 106) and aspect ratio (λ=1.5 to 4.5). Results proved that enhancement ratio increases with decrease of Rayleigh number and it increases with augment of Hartmann number. Also it can be concluded that Nusselt number has a direct relationship with nanoparticle volume fraction, Rayleigh number and it has a reverse relationship with Hartmann number. © 2014.


Hatami M.,Babol Noshirvani University of Technology | Jafaryar M.,Mazandaran Institute of Technology | Ganji D.D.,Babol Noshirvani University of Technology | Gorji-Bandpy M.,Babol Noshirvani University of Technology
International Communications in Heat and Mass Transfer | Year: 2014

In this paper, response surface methodology (RSM) based on central composite design (CCD) is applied to obtain an optimization design of finned type heat exchangers (HEX) to recover waste heat from the exhaust of a diesel engine. The design is performed for a single point operation (1600. rpm and 60. N. m) of an OM314 diesel engine obtained from experimental measurements. Based on the CCD principle, fifteen HEX cases with different fins height, thickness and number are modeled numerically and the optimization is done to have the maximum heat recovery amount and minimum of pressure drop along the heat exchanger. © 2014 Elsevier Ltd.


Sheikholeslami M.,University of Mazandaran | Sheikholeslami M.,Babol Noshirvani University of Technology | Sheikholeslami M.,Mazandaran Institute of Technology | Gorji-Bandpy M.,Babol Noshirvani University of Technology | Gorji-Bandpy M.,Mazandaran Institute of Technology
Powder Technology | Year: 2014

In this paper, free convection of ferrofluid in a cavity heated from below in presence of external magnetic field is studied numerically using the Lattice Boltzmann method. The enclosure is filled with a mixture of kerosene-cobalt. This investigation was compared with other experimental and numerical works and found to be in excellent agreement. Effects of Rayleigh number, magnetic coefficient, heat source length and volume fraction of cobalt on flow and heat transfer characteristics are examined. Results show that particles with a smaller size have better ability to dissipate heat, and a larger volume fraction would provide a stronger driving force which leads to increase in temperature profile. The Nusselt number has direct relationship with the Rayleigh number and heat source length while it has reverse relationship with size of nanoparticle and volume fraction of cobalt. © 2014 Elsevier B.V.


Nadernejad E.,Technical University of Denmark | Nikpour M.,Mazandaran Institute of Technology
Digital Signal Processing: A Review Journal | Year: 2012

In this paper, we have proposed two extensions to pixon-based image modeling. The first one is using bicubic interpolation instead of bilinear interpolation and the second one is using fuzzy filtering method, aiming to improve the quality of the pixonal image. Finally, partial differential equations (PDEs) are applied on the pixonal image for noise removing. The proposed algorithm has been examined on variety of standard images and their performance compared with the existing algorithms. Experimental results show that in comparison with the other existing methods, the proposed algorithm has a better performance in denoising and preserving image edges. © 2012 Elsevier Inc. All rights reserved.


Sheikholeslami M.,Babol Noshirvani University of Technology | Hatami M.,Babol Noshirvani University of Technology | Jafaryar M.,Mazandaran Institute of Technology | Farkhadnia F.,Mazandaran Institute of Technology | And 2 more authors.
Energy and Buildings | Year: 2015

In this study, turbulent flow and heat transfer in an air to water double-pipe heat exchanger is investigated experimentally. The working fluids were air, flowing in the annular pipe, and water through the inner circular tube. To attain fully developed conditions, the heat exchanger was built with additional lengths before and after the test section. The inner tube was made from copper. The external tube was made of an industrial plastic which was insulated from the environment. In this manner, the outer surface of the annular channel can be considered adiabatic. The experiments are conducted in the range of flow rate of water from 120 to 200 (L/h) and in the temperature of water in upper tank range from 70 to 90 °C. Correlations for Nusselt number and friction factor are presented for according to experimental data. Results show that velocity boundary layer thickness in air side increases with increase of the temperature of the water in the upper tank and flow rate of water on heat transfer. Nusselt number in water side is an increasing function of inlet temperature and inlet velocity of water while opposite tend is observed for Nusselt number in air side. Inserting agitator improves the rate of heat transfer. Enhancement of heat transfer has reverse relationship with Reynolds number. © 2014 Published by Elsevier B.V.


Sheikholeslami M.,Mazandaran Institute of Technology | Sheikholeslami M.,University of Mazandaran | Sheikholeslami M.,Babol Noshirvani University of Technology | Ganji D.D.,Babol Noshirvani University of Technology | And 3 more authors.
Journal of the Taiwan Institute of Chemical Engineers | Year: 2014

In this paper, MHD effect on natural convection heat transfer in an inclined L-shape enclosure filled with nanofluid is studied. The numerical investigation is carried out using the control volume based finite element method (CVFEM). The fluid in the enclosure is a water-based nanofluid containing Al2O3 nanoparticle. The effective thermal conductivity and viscosity of nanofluid are calculated by KKL (Koo-Kleinstreuer-Li) correlation in which effect of Brownian motion on the effective thermal conductivity is considered. The heat transfer between cold and hot regions of the enclosure cannot be well understood by using isotherm patterns so heatline visualization technique is used to find the direction and intensity of heat transfer in a domain. Effect of Hartmann number, volume fraction of nanoparticle, Rayleigh number and inclination angle on streamline, isotherm and heatline are examined. The results show that Nusselt number increases with increase of Rayleigh number and volume fraction of nanoparticle while it decreases with augment of Hartmann number and inclination angle. Enhancement in heat transfer has reverse relationship with Hartmann number and Rayleigh number. © 2013 Taiwan Institute of Chemical Engineers.

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