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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.

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.

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.,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.

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.

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