Sharif University of TechnologyScientia Iranica1026-309823620161201Effect of convective transport mechanisms on heat transfer characteristics of nanofluidsEffect of convective transport mechanisms on heat transfer characteristics of nanofluids25672574396610.24200/sci.2016.3966ENE. MohammadpourDepartment of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran.M. EghdamtalabFaculty of Chemical Engineering, Malek Ashtar University of Technology, Tehran, Iran.Journal Article20161225In this study, eect of dierent slip mechanisms that can produce a slip velocity between nanoparticles and base fluid in a nano fluid flow eld has been investigated numerically. A two-phase Euler-Lagrange approach was applied to simulate heat transfer characteristics of dierent nanoparticles in a straight tube under laminar flow condition. Effect of dierent mechanisms such as thermophoresis, Brownian diusion, and Saman lift force on convective heat transfer was investigated and discussed. It is noticed that only Brownian diusion and thermophoresis are important slip mechanisms in nano fluids. In dierent nano fluids, eect of Brownian diusion and thermophoresis on convective heat transfer is dierent. While eect of Brownian diusion is more important in CuO-water nano fluid, thermophoresis is the main slip mechanism in Al2O3-water nano fluid.http://scientiairanica.sharif.edu/article_3966_af54bf162c70ed7196c05837e03e6363.pdfSharif University of TechnologyScientia Iranica1026-309823620161201Soret and Dufour effects on viscoelastic boundary layer flow over a stretching surface with convective boundary condition with radiation and chemical reactionSoret and Dufour effects on viscoelastic boundary layer flow over a stretching surface with convective boundary condition with radiation and chemical reaction25752586396710.24200/sci.2016.3967ENS. EswaramoorthiDepartment of Mathematics, Dr. N.G.P. Arts & Science College, Coimbatore 641048, Tamil Nadu, India.M. BhuvaneswariInstitute of Mathematical Sciences, University of Malaya, Kuala Lumpur 50603, Malaysia.S. SivasankaranInstitute of Mathematical Sciences, University of Malaya, Kuala Lumpur 50603, Malaysia.S. RajanDepartment of Mathematics, Erode Arts & Science College, Erode 638009, Tamil Nadu, India.Journal Article20161225In this article, we investigate the double diusive flow of a viscoelastic fluid on a stretching paper with convective boundary condition under the in fluence of thermal-diusion and diusion-thermo eects, thermal radiation, internal heat generation or absorption, chemical reaction, and thermal radiation. The governing boundary layer equations are analytically solved by using Homotopy Analysis Method (HAM). Variations of the velocity, concentration, and temperature proles for dierent values of physical parameters are graphically displayed and discussed. Numerical results of the local Sherwood number and the local Nusselt number are also tabulated. It is observed that the local Nusselt number increases on increasing the radiation parameter. The local Sherwood number increases on increasing the chemical reaction parameter.http://scientiairanica.sharif.edu/article_3967_cf964918b4bee0b2a2f77bc46e674c01.pdfSharif University of TechnologyScientia Iranica1026-309823620161201Mixed-convection boundary-layer flow of Sisko fluid along a stretching cylinder in a thermally stratied mediumMixed-convection boundary-layer flow of Sisko fluid along a stretching cylinder in a thermally stratied medium25872594396810.24200/sci.2016.3968ENM.Y. MalikDepartment of Mathematics, Quaid-i-Azam University, Islamabad 44000, Pakistan.M. AwaisDepartment of Mathematics, Quaid-i-Azam University, Islamabad 44000, Pakistan.T. SalahuddinDepartment of Mathematics, Quaid-i-Azam University, Islamabad 44000, Pakistan.A. HussainDepartment of Mathematics, Quaid-i-Azam University, Islamabad 44000, Pakistan.S. BilalDepartment of Mathematics, Quaid-i-Azam University, Islamabad 44000, Pakistan.Journal Article20161225The aim of this paper is to gure out the flow and heat problem of twodimensional steady axisymmetric laminar mixed-convection boundary-layer flow of Sisko fluid model along a stretching cylinder in a thermally stratied medium. The similarity transformations are used to reduce coupled partial dierential equations to ordinary dierential equations. To solve these equations, a numerical approach called shooting method has been used for the computation of dierent physical parameters of velocity and temperature eld, respectively. The dependence of skin friction and Nusselt number has been analyzed in details in tables.http://scientiairanica.sharif.edu/article_3968_6cc2ec3f6dd461ed2a5ff3ff3befe006.pdfSharif University of TechnologyScientia Iranica1026-309823620161201Comparison of ISPH and WCSPH methods to solve fluid-structure interaction problemsComparison of ISPH and WCSPH methods to solve fluid-structure interaction problems25952605396910.24200/sci.2016.3969ENHoushang SabahiAmir NiksereshtShiraz University of Technology0000-0001-6151-4679Journal Article20141103In this paper, the in-house code based on the smoothed particle hydrodynamics is proposed to simulate a fluid-solid interaction (FSI) problem. This method is a Lagrangian, mesh-free method and it has a high ability to capture the free surface in two phase flows and also the interface in FSI problems. To compare ofweakly compressible SPH (WCSPH) and incompressible SPH (ISPH) schemes, fluid flow under a hypo-elastic gate is simulated in solid and fluid domains with both methods. At first fluid domain is simulated with ISPH method and solid domain is solved with WCSPH scheme. Another simulation is done with both fluid and solid parts solved with WCSPH method. The results of both methods are in a good agreement with each other and also with other researcher’s results. So it is concluded that it is easier to model the fluid flow with ISPH scheme and the solid part with WCSPH in coupling fluid-solid interaction problems with a good accuracy.http://scientiairanica.sharif.edu/article_3969_df0866fcff34d5c8363a0bd9592a3328.pdfSharif University of TechnologyScientia Iranica1026-309823620161201Large amplitude free vibration of magnetoelectroelastic curved panelsLarge amplitude free vibration of magnetoelectroelastic curved panels26062615397010.24200/sci.2016.3970ENAlireza shooshtariBu_Ali Sina UniversitySoheil RazaviDepartment of Mechanical EngineeringJournal Article20141213In this paper, the large amplitude free vibration of magnetoelectroelastic curved panels is investigated. The panel is considered to be simply-supported on all edges and the magnetoelectroelastic body is subjected to the electric and magnetic fields along direction. To obtain the governing equations of motion, the Donnell shell theory and the Maxwell equations for electrostatics and magnetostatics are used. The nonlinear partial differential equations of motion are reduced to a single nonlinear ordinary differential equation by introducing trail functions for displacements and rotations and then applying the Galerkin method. The resulting equation is solved by multiple time scales perturbation method. Some numerical examples are presented to validate the study and to investigate the effects of several parameters such as the geometry of the panel and the magnetoelectric boundary conditions on the vibration behavior of these smart panels. http://scientiairanica.sharif.edu/article_3970_0203b5b61c469b7f3ea2a4b7c4953469.pdfSharif University of TechnologyScientia Iranica1026-309823620161201Investigating thermal performance of a partly sintered wick heat pipe filled with different working fluidsInvestigating thermal performance of a partly sintered wick heat pipe filled with different working fluids26162625397110.24200/sci.2016.3971ENMohammad KhaliliSharif University of TechnologyMohammad Behshad ShafiiSharif University of TechnologyJournal Article20141117Heat pipes are important cooling devices which are widely used to transfer heat loads. In this paper thermal performance of a novel type of sintered wick heat pipe, namely, partly sintered wick heat pipe has been investigated. The heat pipe was filled with degassed water and acetone, as working fluids, and effects of filling ratio, orientation and heat inputs were tested. Moreover, conditions at which dry-out occurs were presented. Results showed that the best filling ratio for both working fluids is 20%. The heat pipe filled with water has better thermal performance compared with acetone, so that thermal resistances of the 20% water-filled heat pipe are approximately 7%, 27%, and 75% lower than those of the 20% acetone-filled one in the vertical, horizontal, and vertical reverse modes, respectively. This novel type of sintered wick heat pipe has good thermal performance in the horizontal mode and can be used in no-gravity conditions, i.e. space applications.http://scientiairanica.sharif.edu/article_3971_1fe3c1cf7b34f206d3f79dce0ec06adf.pdfSharif University of TechnologyScientia Iranica1026-309823620161201Effect of water-in-heavy fuel oil emulsion on the non-reacting spray characteristics under dierent ambient conditions and injection pressures: A CFD studyEffect of water-in-heavy fuel oil emulsion on the non-reacting spray characteristics under dierent ambient conditions and injection pressures: A CFD study26262640397210.24200/sci.2016.3972ENH. NowruziDepartment of Marine Technology, Amirkabir University of Technology, Tehran, P.O. Box 15875-4413, Iran.P. GhadimiDepartment of Marine Technology, Amirkabir University of Technology, Tehran, P.O. Box 15875-4413, Iran.Journal Article20161225Emulsied fuel is one of the main strategies to substitute the conventional fossil fuel for the purpose of emission control and enhancement of fuel eciency. Accordingly, non-reacting spray characteristics of water-in-Heavy Fuel Oil (HFO) emulsion are numerically investigated in the present study via CFD analysis. Three dierent volumetric percentages of water in HFO are investigated and compared with pure HFO. Eects of four dierent injection pressures on injected fuel spray characteristics are studied. Moreover, in fluences of three dierent ambient back pressures and two ambient temperatures are considered. For these purposes, the characteristics of spray penetration, cone angle, volume, and SMD are evaluated through the analyses of non-dimensional numbers. For modeling the interaction of the fuel discrete phase and the gaseous continuous phase, Eulerian- Lagrangian multiphase formulation in OpenFOAM CFD toolbox is implemented. Fuel droplet tracking in Lagrangian scheme is applied by Lagrangian Particle Tracking method. Also, KH-RT as a hybrid breakup model for liquid fuel core breakup and standard model of k ???? " in RANS for turbulence modeling are utilized. Numerical results are validated against existing experimental data with suitable accordance. Longer spray penetration length, larger cone angle, and greater spray volume are achieved for the emulsied fuels.http://scientiairanica.sharif.edu/article_3972_a7ed01ce3cc3e5c190a27fc261c79a6d.pdfSharif University of TechnologyScientia Iranica1026-309823620161201Simulation of thermally developing laminar flow in partially lled porous pipes under wall suctionSimulation of thermally developing laminar flow in partially lled porous pipes under wall suction26412649397310.24200/sci.2016.3973ENA. Nouri-BorujerdiSchool of Mechanical Engineering, Sharif University of Technology, Tehran, Iran.M.H. Seyyed-HashemiSchool of Mechanical Engineering, Sharif University of Technology, Tehran, Iran.Journal Article20161225This study numerically investigates fluid flow and heat transfer enhancement of a two-dimensional developing laminar flow in an axisymmetric pipe with partially lled porous material attached to the wall. The eects of porous layer in the range of 0 =Rhttp://scientiairanica.sharif.edu/article_3973_b0875a25ef9deadb66811ab3e126370d.pdfSharif University of TechnologyScientia Iranica1026-309823620161201Study of peristaltic flow of magnetohydrodynamics Walter's B fluid with slip and heat transferStudy of peristaltic flow of magnetohydrodynamics Walter's B fluid with slip and heat transfer26502662397410.24200/sci.2016.3974ENAmbreen A. KhanDepartment of Mathematics & Statistics, FBAS, IIUI, H-10, Islamabad, PakistanHafsa UsmanDepartment of Mathematics & Statistics, FBAS, IIUI, H-10, Islamabad, PakistanK. VafaiDepartment of Mechanical Engineering, University of California Riverside, USAR. EllahiDepartment of Mathematics Faculty of Science Taibah University, Madinah Munawwarah Saudi ArabiaJournal Article20161009The purpose of this paper is to investigate the effects of magnetohydrodynamics peristaltic flow of Walter's B fluid in an inclined asymmetric channel under the influence of slip conditions. The effects of heat and mass transfer are also taken into account. Analytical solutions of nonlinear coupled equations are obtained by regular perturbation method. Graphs for different flow parameters of interest are sketched and analyzed. It is observed that the absolute value of shear stress and heat transfer coefficient decreases by increasing the magnetic parameter whereas with the increase of magnetic parameter, the concentration decreases. Opposite behavior has been noted for temperature and heat transfer coefficient at upper and lower walls against the various values of Prandtl number, Eckert number, slip parameter and material constant of Walter's B fluid. Oscillatory behavior of heat transfer coefficient is observed which is due to propagation of peristaltic waves along the walls of the channel.http://scientiairanica.sharif.edu/article_3974_fbf6b72d0b6ecf5b5a85b25a9b7da7c2.pdfSharif University of TechnologyScientia Iranica1026-309823620161201Rolling Schedule Multi-objective Optimizationbased on Influence Function for Thin Gauge Steel Strip in Tandem Cold RollingRolling Schedule Multi-objective Optimizationbased on Influence Function for Thin Gauge Steel Strip in Tandem Cold Rolling26632672397510.24200/sci.2016.3975ENH.N. BuState Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, ChinaZ.W. YanState Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, ChinaD.H. ZhangState Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, ChinaS.Z. ChenState Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, ChinaJournal Article20151129The setting of rolling schedule in tandem cold mill is one of the most crucial content in rolling process, which will have a direct impact on product quality and production efficiency. According to the actual requirements in the rolling process, a multi-objective function based on influence function method was built. The objective function was aimed specially at thin gauge strip and solved by Tabu search algorithm. Meanwhile, in order to avoid the strip slipping by the reduction of friction coefficient, the tension schedule was corrected according to the rolling length of work roll. The proposed optimization method has been applied successfully to a 1450mm 5-stand tandem cold mill. Application results show that the optimized rolling schedules are more close to the actual requirements and the flatness quality is improved greatly.http://scientiairanica.sharif.edu/article_3975_d2fafe5dc98357349547fba1e649f018.pdfSharif University of TechnologyScientia Iranica1026-309823620161201A comparison between entropy generation analysis and first law eciency in a monoplane Wells turbineA comparison between entropy generation analysis and first law eciency in a monoplane Wells turbine26732681397610.24200/sci.2016.3976ENE. LakzianDepartment of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, Iran.R. SoltanmohamadiDepartment of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, Iran.M. NazeryanDepartment of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, Iran.Journal Article20161225Wells turbine is a promising self-rectifying device in the eld of ocean wave energy conversion. This study presents an Entropy Generation Analysis (EGA) of isothermal flow through a monoplane Wells turbine. The numerical computation has performed by solving the steady, incompressible, and three-dimensional Reynolds- Averaged Navier-Stokes (RANS) equations with RNG k ???? " turbulence model in a noninertial reference frame rotating with the turbine rotor. Then, local entropy generation rates, related to viscous dissipation around rotor blades, were calculated from the velocity elds. The results indicate that separation and boundary-layer interaction have a direct eect on the entropy generation. The blade entropy generation decreases from hub to tip and from leading edge to trailing edge in suction surface. Also, the result of comparison shows that the point of minimum entropy generation coincides with the point of maximum rst law eciency of thermodynamics. The results prove that viscous entropy generation distribution provides designers with useful information about the causes of flow irreversibilities. Future monoplane Wells turbine designs should concentrate essentially on optimizing the blade geometry.http://scientiairanica.sharif.edu/article_3976_20a08e4fe72a4bc8244626eeb91b6c5a.pdfSharif University of TechnologyScientia Iranica1026-309823620161201A multi-step Gaussian filtering approach to reduce the effect of non-Gaussian distribution in aerial localization of an RF source in NLOS conditionA multi-step Gaussian filtering approach to reduce the effect of non-Gaussian distribution in aerial localization of an RF source in NLOS condition26822693397710.24200/sci.2016.3977ENS.M.M. DehghanAdvanced Robotics and Intelligent Systems Laboratory, School of Electrical and Computer Engineering, University of Tehran, Teran, Iran.H. MoradiIntelligent Systems Research Institute, SKKU, South Korea.Journal Article20161225The hybrid localization using Angle Of Arrival (AOA) and Dierential Received Strength Signal Indicator (DRSSI) of an RF source with unknown power and Non- Line-Of-Sight (NLOS) condition has been proven to be advantageous compared to using each method separately. In this paper, the initial hybrid method, which was implemented using particle lters due to the multi-modal/non-Gaussian nature of localization in NLOS condition, has been replaced by a multi-step Gaussian ltering approach which provides similar accuracy with better performance. This has been done using DRSSI input in the rst step of the ltering to determine the linearization point, and then using AOA and DRSSI inputs together in the second step of the ltering to improve the localization accuracy. The proposed method has been implemented using Extended Kalman lter and Unscented Kalman lter. The simulation results show that the accuracy of the multi-step Gaussian ltering is comparable to the particle ltering approach with much lower computational load that is important for online localization of several RF sources. Furthermore, the eects of uncertainty on the propagation parameters have been studied to show that the robustness of the multi-step Gaussian ltering to the uncertainties is comparable to the particle lter approach.http://scientiairanica.sharif.edu/article_3977_b6f76a4936e2e05fb5ac68c03e48cbf1.pdfSharif University of TechnologyScientia Iranica1026-309823620161201Retracted: Aerodynamic and Performance Evaluation of a Variable-Sweep Morphing Wing26942703397810.24200/sci.2016.3978ENabbas tarabisajjad ghasemloomahmood maniJournal Article20150628This paper reports on a numerical and experimental investigation of a variable-sweep morphing wing for an unmanned aerial vehicle (UAV) whereby the area and the aspect ratio of the wing can change while its overall configuration is kept nearly unchanged. The numerical results were obtained using computational fluid dynamics (CDF) and the experimental data from a low-speed wind tunnel test at the speeds of 50, 60, and 70 m/s. The extent of change in the sweep angle of the morphing wing relative to the base wing is 12 degrees (i.e. 36%). The results of this study show that lift coefficient, lift curve slope, drag coefficient and the aerodynamic efficiency of the model wing decrease as the sweep angle increases. According to experimental results, the maximum reduction in the drag coefficient of the morphing wing is 6.1% as the sweep angle increases from 33 to 45 deg. Also, the maximum changes in the aerodynamic efficiency of the model with sweep angle changing from 33 to 45 degrees occur at 6 degree angle of attack, which is equal to 11.6%. With changing the wing sweep, the maximum change of flight range and endurance were found to be 8.77 and 7.15%, respectively.