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Efficient approaches of determining the motion of a spherical particle in a swirling fluid flow using weighted residual methods

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Particuology 2015年第6期13卷 68-74页

作者： Seiyed E. Ghasemi M. Vatani d.d. ganji Young Researchers and Elite Club Qaemshahr Branch Islamic Azad University Qaemshahr lran department of Mechanical Engineering Babol University of Technology Babol lran

The motion of a spherical particle released in a swirling fluid flow is studied employing the least-squares method and method of moments. The governing equations are obtained and solved employing the two methods. The accuracy of the results is examined against the results of a fourth-order Runge-Kutta numer- ical method. The effects of various parameters, namely the initial radius, initial radial velocity, initial angular velocity, and.d.ag-to-inertia ratio, on the non-dimensional velocity profiles and particle position distribution are considered. The results show that the radial velocity increases over time while the angular velocity decreases, and that an increase in the initial radial velocity increases the particle radial distance and angular velocity but decreases the radial velocity profile.

关键词： Spherical particle Swirling flow Radial velocity Angular velocity Least-squares method Method of moments

Analysis of turbulent MHd Couette nanofluid flow and heat transfer using hybrid.d.M-FdM

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Particuology 2016年第3期14卷 95-101页

作者： S. Mosayebidorcheh M. Sheikholeslami M. Hatami d.d. ganji Young Researchers and Elite Club Najafabad Branch lslamicAzad University Ndjafabad Iran department of Mechanical Engineering Lenjan Branch Islamic Azad University lsfahan Iron department of Mechanical Engineering Babol University of Technology Babol Iran Mechanical Engineering department Engineering and Technical College Esfarayen University Esfarayen North Khorasan lran

Unsteady turbulent magnetohydrodynamic nanofluid hydrothermal treatment is studied. The zero- equation turbulence model is used to simulate turbulent flow. The modeling results obtained by applying the hybrid.d.fferential transformation method-finite difference method to solve this problem confirm its viability. An analytical procedure is used for finding the effects of the problem parameters. Results indicate that the average Nusselt number over the lower plate depends linearly on volume fraction of nanofluid, Hall parameter, turbulent Eckert number, and Reynolds number whereas it is inversely proportional on the Hartmann number and the turbulent parameter.

关键词： Turbulent Hall effect Hybrid.d.M-FdM Nanofluid Magnetohydrodynarnic couette flow

Analyzing the nonlinear vibrational wave differential equation for the simplified model of Tower Cranes by Algebraic Method

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Frontiers of Mechanical Engineering 2014年第1期9卷 58-70页

作者： M.R. AKBARI d.d. ganji A.R. AHMAdI Sayyid H. Hashemi KACHAPI department of Civil Engineering The University of Pardisan Mazan-daran and Department of Chemical Engineering University of TehranP.O. Box 66456-43516 Iran department of Mechanical Engineering Babol University of Technol-ogy P.O. Box 484 Babol Iran department of Mechanical Engineering Sari Branch Islamic AzadUniversity Sari P.O. Box 48161-19318 Iran

In the current paper, a simplified model of Tower Cranes has been presented in order to investigate and analyze the nonlinear differential equation governing on the presented system in three different cases by Algebraic Method （AGM）. Comparisons have been made between AGM and Numerical Solution, and these results have been indicated that this approach is very efficient and easy so it can be applied for other nonlinear equations. It is citable that there are some valuable advantages in this way of solving differential equations and also the answer of various sets of complicated.d.fferential equations can be achieved in this manner which in the other methods, so far, they have not had acceptable solutions. The simplification of the solution procedure in Algebraic Method and its application for solving a wide variety of differential equations not only in Vibrations but also in different fields of study such as fluid mechanics, chemical engineering, etc. make AGM be a powerful and useful role model for researchers in order to solve complicated nonlinear differential equations.

关键词： Algebraic Method (AGM) tower crane,oscillating system angular frequency

Motion of a spherical particle in a fluid forced vortex by dQM and.d.M

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Particuology 2014年第5期12卷 206-212页

作者： M.Hatami d.d.ganji Esfarayen University Department of Mechanical EngineeringEsfarayenNorth KhorasanIran Mechanical Engineering Faculty Babol University of TechnologyBabolP.O.Box 484Iran

In this study, coupled equations of the motion of a particle in a fluid forced vortex were investigated using the differential transformation method （dTM） with the Pad6 approximation and the differential quadrature method （dO_M）. The significant contribution of the work is the introduction of two new, fast and efficient solutions for a spherical particle in a forced vortex that are improvements over the previous numerical results in the literature. These methods represent approximations with a high degree of accuracy and minimal computational effort for studying the particle motion in a fluid forced vortex. In addition, the velocity profiles （angular and radial） and the position trajectory of a particle in a fluid forced vortex are described in the current study.

关键词： Spherical particle Forced vortex differential transformation method (dTM)Angular velocity differential quadrature method (dQM)

First Principles Simulation of Molecular Oxygen Adsorption on SiC Nanotubes

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Communications in Theoretical Physics 2010年第4期53卷 742-748页

作者： M.d.ganji B.Ahaz department of Chemistry Islamic Azad University

We study the binding of molecular oxygen to a （5, 0） single walled SiC nanotube, by means of density functional calculations. The center of a hexagon of silicon and carbon atoms in sites on SiCNT surfaces is the most stable adsorption site for 02 molecule, with a binding energy of -38.22 eV and an average Si-O binding distance of 1.698 A. We have also tested the stability of the 02-adsorbed SiCNT/CNT with ab initio molecular dynamics simulation which have been carried out at room temperature. Furthermore, the adsorption of 02 on the single walled carbon nanotubes has been investigated. Our first-principles calculations predict that the 02 adsorptive capability of silicon carbide nanotubes is much better than that of carbon nanotubes. This might have potential for gas detection and energy storage.

关键词： adsorption oxygen molecule dFT SiCNTs CNTs sensors

Interaction between B-doped C60 Fullerene and Glycine Amino Acid from First-Principles Simulation

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Chinese Physics Letters 2010年第4期27卷 83-86页

作者： M. d. ganji H. Yazdani department of Chemistry Islamic Azad University Ghaemshahr branch Mazandaran Iran

The possibility of formation of complexes between glycine and boron doped C60 （C59B） fullerene is investigated and compared with that of C60 fullerene by using the density functional theory calculations. It has been found that the binding of glycine to C59B generated the most stable complexes via its carbonyl oxygen active site, with a binding energy of-37.89 kcal/mol, while the glycine molecule prefers to bind to the pure C60 cage via its amino nitrogen active site, consistent with the recent experimental and theoretical studies. We have also tested the stability of the most stable Gly-C59B complex with ab initio molecular dynamics simulation, carried out at room temperature. These indicate that the B-doped C60 fullerenes seem to be more suitable materials for bindings to proteins than pure C60 fullerenes.

关键词： Surfaces interfaces and thin films Biological physics Condensed matter: structural mechanical & thermal Chemical physics and physical chemistry

Solution of nonlinear cubic-quintic duffing oscillators using He’s Energy Balance Method

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第9期10卷 1263-1268页

作者： d.d.ganji M.GORJI S.SOLEIMANI M.ESMAEILPOUR department of Mechanical Engineering University of Mazandaran

In this study, He＇s Energy Balance Method （EBM） was applied to solve strong nonlinear duffing oscillators with cubic-quintic nonlinear restoring force. The complete EBM solution procedure of the cubic-quintic duffing oscillator equation is presented. For illustration of effectiveness and convenience of the EBM, different cases of cubic-quintic duffing oscillator with different parameters of α,β and y were compared with the exact solution. We found that the solutions were valid for small as well as large amplitudes of oscillation. The results show that the EBM is very convenient and precise, so it can be widely appli- cable in engineering and other sciences.

关键词： Energy Balance Method (EBM) Cubic-quintic duffing equation Oscillator

Interaction of Methane with Single-Walled Carbon Nanotubes: Role of defects,Curvature and Nanotubes Type

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Communications in Theoretical Physics 2010年第5期53卷 987-993页

作者： M.d.ganji M.Asghary A.A.Najafi department of Chemistry Islamic Azad University department of Chemistry University of Payam-e-noor

We investigate the interaction of single-walled carbon nanotubes （SWCNTs） and methane molecule from the first principles. Adsorption energies are calculated, and methane affinities for the typical semiconducting and metallic nanotubes are compared. We also discuss role of the structural defects and nanotube curvature on the adsorption capability of the SWCNTs. We could observe larger adsorption energies for the metallic CNTs in comparison with the semiconducting CNTs. The obtained results for the zig zag nanotubes with various diameters reveal that the adsorption energy is higher for nanotubes with larger diameters. For defected tubes the adsorption energies are calculated for various configurations such as methane molecule approaching to the defect sites pentagon, hexagon, and heptagon in the tube surface. The results show that the introduce defects have an important contribution to the adsorption mechanism of the methane on SWNTs.

关键词： methane SWCNTs adsorption encapsulation ab initio calculations energy storage

Transient thermal behavior of radial fins of rectangular,triangular and hyperbolic profiles with temperature-dependent properties using dTM-FdM

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Journal of Central South University 2017年第3期24卷 675-682页

作者： Sobhan Mosayebidorcheh Mohammad Rahimi-Gorji d.d.ganji Taha Moayebidorcheh O Pourmehran M.Biglarian Young Researchers and Elite Club Najafabad BranchIslamic Azad UniversityNajafabadIran Young Researchers and Elite Club Gorgan BranchIslamic Azad UniversityGorganIran Mechanical Engineering department Babol University of TechnologyBabolMazandaranIran department of Mechanical Engineering Sharif University of TechnologyTehranIran

This work focuses on transient thermal behavior of radial fins of rectangular,triangular and hyperbolic profiles with temperature-dependent properties.A hybrid numerical algorithm which combines differential transformation(dTM) and finite difference(FdM) methods is utilized to theoretically study the present *** and FdM are applied to the time and space domains of the problem,*** accuracy of this method solution is checked against the numerical ***,the effects of some applicable parameters were studied *** a broad range of governing parameters are investigated,the results could be useful in a number of industrial and engineering applications.

关键词： transient thermal behavior radial fin thermal conductivity temperature-dependent property hybrid.d.fferential transformation-finite difference (dTM-FdM)