Sharif University of TechnologyScientia Iranica1026-3098322020251101Heat transfer effects on cilia-assisted flow of viscoelastic nanofluid under an inclined magnetic field: Lubrication approximations7344734410.24200/sci.2024.61506.7344ENKhurramJavidDepartment of Mathematics, Northern University, Nowshera, Pakistan.KamelAl-KhaledDepartment of Mathematics & Statistics, Jordan University of Science and Technology, Irbid, Jordan.SaleemKhanDepartment of Mathematics, Northern University, Nowshera, Pakistan.Sami UllahKhanDepartment of Mathematics, Namal University, Mianwali, Pakistan.NesrineZahiLaboratory of Thermal and Energy Systems Studies, National Engineering School of Monastir, University of Monastir, Monastir, Tunisia.ChemseddineMaatkiDepartment of Mechanical Engineering, College of Engineering, Imam Mohammad Ibn Saud Islamic University, Riyadh, Saudi Arabia.KarimKriaaDepartment of Chemical Engineering, College of Engineering, Imam Mohammad Ibn Saud Islamic University, Riyadh, Saudi Arabia.LiouaKolsiDepartment of Mechanical Engineering, College of Engineering, University of Ha’il, Ha’il City, Saudi Arabia.Laboratory of Metrology and Energy Systems, Energy Engineering Department, National Engineering School, University of Monastir,
Monastir, Tunisia.0000-0003-4368-7458Journal Article20221125A numerical study has been investigated for Magneto-Hydrodynamics (MHD) pumping of viscoelastic nanofluid by means of heat transfer in a complex ciliated channel. The Jeffrey model is followed as a non-Newtonian Fluid (NF) (blood) in the current investigations because of its dual characteristics: One is viscosity effects, and the second is elastic in nature. The fluid motion is parallel to the direction of metachronal waves. The metachronal waves are mobilized by the cilia transport. The magnetic force reflection at a horizontal angle in an inclined direction is implemented. The system identifying via distinct equations is expressed in wave frame which is further normalized the flow system by using scaling quantities. In the next step, the normalized form of the rheological equations will be reduced by using lubrication approximations. The Numerical Differential (ND) computational tool is implemented for the simulation process. The fluid transport is controlled by wave number, eccentric parameter of cilia, ciliated length, inclined magnetic force and non-Newtonian parameter.https://scientiairanica.sharif.edu/article_23477_270a009cf37d7723c38fff4a2ef7eb57.pdfSharif University of TechnologyScientia Iranica1026-3098322020251101Effects of heat transfer on magnetohydrodynamics suction-injection model of viscous fluid flow through differential transformation and Hermite wavelet techniques7510751010.24200/sci.2024.61829.7510ENKondethimmanahalli RangadhamappaRaghunathaDepartment of Mathematics, Davangere University, Davangere, India.YathishwarappaVinodDepartment of Mathematics, Davangere University, Davangere, India.SrinivasaKumbinarasaiahDepartment of Mathematics, Bangalore University, Bangalore, India.0000-0001-8942-7892Journal Article20230207This study investigates the magnetohydrodynamic flow and heat transfer between two parallel disks, considering suction and injection effects at the disks. The governing equations describing the flow and thermal transport are derived based on the principles of mass, momentum, and energy conservation for an electrically conducting fluid. As the governing Partial Differential Equations (PDEs) are highly nonlinear, similarity transformations are applied to transform them into coupled Ordinary Differential Equations (ODEs). Numerical techniques, namely the Hermite Wavelet Method (HWM) and Differential Transformation Technique (DTT), are then employed to solve the transformed equations. Parametric effects of several influential parameters such as the Prandtl number (Pr), Squeeze number (S), Hartmann number (M), and Thermophoresis parameter (Nt) on the velocity and temperature profiles are systematically analyzed. Comparisons are made with previous findings in the literature. The results indicate significant dependence of flow behavior and heat transfer on the governing parameters. Velocity and temperature distributions in the boundary layer are presented and discussed in detail. The proposed mathematical model and numerical approach provide useful insights into heat transfer characteristics for parallel disk systems and similar engineering applications involving magnetohydrodynamic flows with suction or injection effects.https://scientiairanica.sharif.edu/article_23555_fbc6b5820361c8821a48b26843548b34.pdfSharif University of TechnologyScientia Iranica1026-3098322020251101A study on centrifugal pump performance treating different fluid7614761410.24200/sci.2025.62043.7614ENRola SamirAfifyDepartment of Mechanical Engineering, College of Engineering and Technology, Arab Academy for Science Technology and Maritime Transport (AASTMT), Miami, Egypt.0000-0002-5116-3163Nourhan H.AbdouDepartment of Mechanical Engineering, College of Engineering and Technology, Arab Academy for Science Technology and Maritime Transport (AASTMT), Miami, Egypt.Mahmoud H.SalemDepartment of Mechanical Engineering, College of Engineering and Technology, Arab Academy for Science Technology and Maritime Transport (AASTMT), Miami, Egypt.0000-0002-5437-9621Kamal AliIbrahimDepartment of Mechanical Engineering, Faculty of Engineering, Menofia University, Menofia, Egypt.Journal Article20230304Understanding centrifugal pump local flow characteristics under different piping systems flow conditions is important. Single and two-phase flows applications via centrifugal pump are widely used in many industries. In the present work, the behavior of emulsion (oil-in-water) and air-water mixture flows through a single stage radial flow type centrifugal pump at three different pump rotation speeds has been studied experimentally and analytically. Effects of oil type, oil concentrations and air injected into the pump suction side on the pump performance under different operating conditions were considered. For each operating condition, pump discharge, generated head, efficiency and the power required to drive the pump were mainly affected by the type of oil, oil concentrations, the amount of air bubbles flowing through the pump impeller and the air injection position in the suction pipe. The results obtained from this study are valuable for chemical and petroleum industries.https://scientiairanica.sharif.edu/article_24174_16db7db24367bf438df20ad57112c8e0.pdfSharif University of TechnologyScientia Iranica1026-3098322020251101Pressure drops decrease and heat transfer increase in the internal flow using a new geometry7600760010.24200/sci.2023.62015.7600ENAhmadBedramDepartment of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran.0000-0001-6843-767XJournal Article20230227This paper presented investigates nanofluid heat transfer inside the channel. The considered fluid was a nanofluid consisting of water and aluminum oxide nanoparticles. Nanofluid volume fraction from 0 to 4% and Reynolds numbers from 5 to 700 have been investigated. Numerous numerical results have been obtained, including: velocity profile, temperature, pressure and Nusselt number. Pressure, velocity and temperature contours were also presented and streamlines were drawn at different Reynolds numbers. The geometry of this research, decreases the pressure drop. For example, at a Reynolds number of 200, the fluid temperature increase in the geometry of this paper was 181% higher than that of a simple tube (with similar conditions), and the pressure drop was 19% lower than the pressure drop of a simple tube. Also, a stagnation point was formed in the flow, where the highest pressure in the problem occurred at that point.https://scientiairanica.sharif.edu/article_24176_e0367289ec0a27a321e4c726d00984eb.pdfSharif University of TechnologyScientia Iranica1026-3098322020251101Investigation of the static trim angle effects on the hydrodynamic performance of a semi-planing catamaran in calm water and waves7544754410.24200/sci.2024.61884.7544ENAliasgharMoghaddasDepartment of Maritime Engineering, Amirkabir University of Technology, Tehran, Iran.HamidZeraatgarDepartment of Maritime Engineering, Amirkabir University of Technology, Tehran, Iran.Journal Article20230219This article uses the model test to investigate the effect of static trim angle on the hydrodynamic performance of a Semi-Planing Catamaran (SPC) named AUT-SEM00. First, the resistance test results in calm water at different speeds for static trim angles of 0.00 to 4.00 o are presented. The best static trim angle, hence the lowest resistance, is 2.0o at a speed of 3.78 m/s, which leads to the dynamic trim of 2.5o. Then, the model test in three regular waves in a range of static trim angles is conducted, and the results are analyzed. It has been seen that the best static trim angle, in comparison to the other trim angles, depicts up to 9% less resistance. Additionally, it is shown that the static trim angle does not significantly affect pitch motion and vertical accelerations. As far as the regular wavelength is concerned, the pitch and accelerations on the Center of Gravity (CG) and Fore Perpendicular (FP) rapidly increase as wavelength increases. There is a strong correlation between vertical acceleration and pitch motion, where both have the same tendency concerning the wavelength.https://scientiairanica.sharif.edu/article_24190_ce4a5cd2d961ac2c758c43c3c2b72caa.pdfSharif University of TechnologyScientia Iranica1026-3098322020251101Hybrid numerical-experimental study of an offshore piezoelectric energy harvesting from water waves7404740410.24200/sci.2024.61609.7404ENSeyed BehnamHosseiniMechanical Engineering Department, Faculty of Engineering, University of Zanjan, Zanjan, Iran.Mohammad MostafaMohammadiMechanical Engineering Department, Faculty of Engineering, University of Zanjan, Zanjan, Iran.JafarGhazanfarianMechanical Engineering Department, Faculty of Engineering, University of Zanjan, Zanjan, Iran.Journal Article20230107A novel cantilever piezoelectric energy harvester with a modified structure of tilting beam has been designed to harness energy from water waves. New suggestions are presented for analysis of the interaction of the nonlinear waves with the beam surface using a hybrid theoretical/experimental approach. The experimental tests are conducted to investigate the e ect of di erent design parameters such as the longitudinal distance of the cantilever beam from the wave-maker, the shape of the oar-like tip of the beam, the angle of spatial orientation, the strength of the waves, the material of the piezo-harvester, and the depth of the beam below the free surface on the output voltage. Numerical simulations are conducted based on the beam deformation captured by a high-speed camera. It is found that adding the torsional moment led to the generation of about 13% and 50% higher Root Mean Square (RMS) and peak-to-peak voltages in comparison to the pure bending case, respectively. By increasing the indentation from 3 cm to 6 cm, about an 18be captured in the produced voltage. These results can be used to train a model for a control system to keep the optimum angle between the water waves and the beam.https://scientiairanica.sharif.edu/article_24259_b84931d049a63cf56e0a47379c26c5cf.pdf