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مهندسی مکانیک شریف
ISSN 2676-4725 · Sharif University of Technology · 188 articles in the index
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Numerical simulation of film pool boiling of ethanol-based nanofluids
In recent decades, thermal-fluid specialists have made considerable efforts to investigate the boiling heat transfer process. Pool boiling of pure liquids and nanofluids has been widely studied in the last decade, but the existing knowledge on modeling of nanofluids pool boiling process is still…
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Numerical and experimental analysis of anisotropic damage growth and martensitic phase change due to plastic strain at ambient temperature
This study investigates the anisotropic damage growth and martensitic phase transformation in AISI-316 austenitic stainless steel at room temperature. Initially, tensile and torsion tests were performed on samples at various displacements. Following these tests, the samples were analyzed using…
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Investigating the effect of Texture Intensity on the Forming Limit Diagram of Magnesium Microtubes used in Stents using Crystal Plasticity Finite Element Modeling
Metal microtubes are usually made using the extrusion method, eventually creating a special texture in the tube. The way tissue is created in the microtube has a significant effect on its mechanical properties, which is very effective in the quality of the fabricated stents. In this research, the…
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Developing an Interface Tracking Coupled Solver for Solving two Phase Flow Fields at Low Reynolds Numbers in foam-extend Platform
In the present study, for the first time, a finite volume coupled solver is developed for the simultaneous numerical solving of two-phase incompressible fluid flow equations at low Reynolds numbers, and for solving the the interface position equation by applying interface boundary conditions using…
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A Comparative Study of the Aerodynamic Performance and Economic Viability of H-Shape and V-Shape Wind Turbines in the Climate of Zahedan City
This research evaluates two types of vertical axis turbines from both an aerodynamic and economic perspective. The turbines used in this study have straight (H-shaped) and angled (V-shaped) blades, with equivalent dimensional characteristics that are suitable for the climatic conditions and average…
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Experimental Investigation and Simulation of Controlled Size Droplet Formation in a Capillary Microdevice
This study focuses on the precise production of droplets in a droplet-based microfluidic device, where monodisperse oil-in-water emulsions with controlled droplet sizes are generated. The primary objective is to achieve uniform emulsions by examining key parameters such as additives in the…
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Experimental acoustic study of small horizontal axis wind turbines based on computational fluid dynamics and artificial intelligence approaches
In modern wind turbine design, two significant challenges arise: achieving optimal aerodynamic performance while minimizing acoustic noise emissions. However, the extensive numerical computations required for accurate evaluation often hinder the implementation of multi-objective optimization…
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Investigating the stability of the yield strength of the friction stir welding joint of similar amorphous thermoplastic based on the Ordered Weighted Averaging operators
This paper presents an investigation of the yield strength of welded ABS thermoplastics. Welding is carried out using a steel tool mounted on a milling machine. The pin of the tools consists of cylindrical and conical profiles. Due to frictional heat and severe displacement, fusion weld occurs…
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A nonlinear model for vibro-acoustic analysis of a submerged axially moving cylindrical shell
Investigating the acoustic vibrations of moving cylindrical shells in fluid is of interest to researchers due to their many applications in marine structures. Underwater vehicles, submarine pipelines, and oil and gas industries are examples of shells used in the marine industry. Analyzing the…
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Intelligent Fault Detection of Rolling Element Bearing under Variable Operating Conditions by Convolutional Neural Network using Time and Frequency Domain Signals
Intelligent detection of rolling element bearing faults is a critical aspect of rotating equipment condition monitoring. Early detection of faults holds significant economic value for industrial units in terms of maintenance and planning. Traditional intelligent fault detection algorithms, which…
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Fractional Order Sliding Mode Controller (FOSMC) Design for Attitude Control of a Satellite with Coupled Rigid–Flexible Structures Using Fractional Order Transfer Function
One of the critical problems in controlling mechanical systems is the structural interactions. Obviously, all the bodies have elastic behavior, and rigidity is assumed to reduce the modeling complexity, which is not applicable to many situations. For example, gravity gradient booms and solar panels…
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A design algorithm and numerical investigation of a water-jacket cooling system for a high-altitude simulator diffuser
Usually, in a high-altitude test facility, an exhaust diffuser is applied to create and maintain a vacuum condition in the motor test chamber utilizing the energy of the exhaust gases. In this system, the temperature of the exhaust gases, which directly hit the diffuser's inner walls, is much…
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Experimental determination of correction factors from Charpy impact testing of API X65 steel with varying specimen thickness
The purpose of this research, in addition to determining the characteristic forces, including the yield force and maximum force, was to calculate the correction factors to predict the onset of failure in the energy transmission pipelines with high toughness under dynamic (impact) loading. To…
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Flexibility and Geometric Optimization of a New Structure for a Polymer Stent with the Finite Element Method
Cardiovascular diseases cause many problems for patients, and the main reason is associated with arteriosclerosis. According to the American Heart Association, atherosclerosis is a condition caused by the accumulation of a substance called plaque in the walls of arteries. Today, special methods are…
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Reliability-Based Multidisciplinary Design Optimization Under Uncertainty for Reusable Flexible Space Launcher utilizing NSGA-II
Complex systems design problems entail a suitable structure in which all disciplines, including their coupled relationships, have been considered and modeled at the same time. These types of design problems involve time and computational cost challenges. Multi-Disciplinary Design Optimization (MDO)…
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Experimental study of the effect of oil-based nanofluid on heat transfer characteristics in different arrangements of wavy microchannels
The development of microchannel manufacturing technology has led to a growing interest in using them as heat exchangers. Microchannels are used to control the temperature of equipment and components that generate a high amount of heat flux. Heat transfer can be further increased by dispersing…
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Proposing an empirical motion-time pattern for human gaze behavior in different social situations
Social robots that are fabricated to interact with humans and to help them in education, healthcare, etc., are required to have an interactive behavior similar to humans. One of the important interactive behaviors of humans is social eye gaze. Eye gaze is significantly more important than other…
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Nanocars assembly on a surface: coarse-grained molecular dynamics study
Using coarse-grained molecular dynamics (CGMD), the simulations of the nanostructures are performed considerably faster and with low computational costs. In the present study, a coarse-grained model is proposed for describing the surface assembly of a molecular machine called a nanotruck. In this…
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Nanoparticles in the turbulent flow behind the backward step by Eulerian-Lagrangian method
Turbulent backward step flow, including air and copper nanoparticles, has been simulated using the Computational Fluid Dynamics (CFD) method by the Eulerian-Lagrangian method. The simulation was done using two- and three-dimensional methods with CFX and FLUENT software. The obtained results were…
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Investigating of size-dependent buckling and instability caused by support forces and electrostatic field in porous annular microplates
In this paper, the static behavior, instability and buckling in porous micro plates under electrostatic field are investigated based on the modified couple stress theory and with regard to modeling, determining equations and solution methods. The plate is considered to be porous and the porosity…