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    Determine the Thickness of Boundary Layer in Free Convection on the Vertical Plate With Uniform Heat Flux

    , M.Sc. Thesis Sharif University of Technology ainali, Omid (Author) ; Shafie, Behshad (Supervisor)
    Abstract
    Experiments were performed to explore the free convective hat transfer characteristics of water based nanofluids. Experiments of natural convection over a vertical flat plate with constant heat flux in water-based nanofluids with Ag and TiO2 nanoparticles were performed. Velocity boundary layer measured using PIV method. Also convective heat transfer coefficient obtained using three thermometers behind the wall. Various test cases with different heat fluxes on the wall are considered. Two volumetric concentrations of Ag nanofluid, 1% and 2%, and TiO2 nanofluid, 1% and 2%, were tested in the present study. It was shown that, with increasing nanofluid concentration, velocity boundary layer... 

    Design and Analysis of Engine Lubrication System for SP1 Engine

    , M.Sc. Thesis Sharif University of Technology Mohamadlou, Mohamad (Author) ; Shafie, Mohamad Behshad (Supervisor)
    Abstract
    Oil pump is a prominent part which has been described as a vehicle heart. Any malfunction or improper design may lead to engine failure. beside engine, proper design of oil route and lubrication system of vehicle, are main factor in engine design, which provide higher efficiency with lower pressure drop. lubrication system should be able to provide required pressure and flow of oil in vast range of engine rotation speed. also minimum energy waste in higher rpm is a key factor which happens due to reverse flow from output to input of pump in the relief valve. The aim of this thesis focus on design of oil pump and lubrication system of 4 cylinder 16 valve of 1600 cc inline engine. which is... 

    Comparative Study of Gasoline and Ethanol Combustion in a SI Engine Combustion Chamber Using Closed Cycle CFD Simulation

    , M.Sc. Thesis Sharif University of Technology Rezaie, Milad (Author) ; Hosseini, Vahid (Supervisor) ; Shafie, Behshad (Supervisor)
    Abstract
    At today’s crowded world, the importance of automobile transportation is obvious for all. The fossil fuel pollution crisis has increased the need for renewable-fueled engines with higher efficiency and lower emissions. Meanwhile, biofuels have received more attention for reasons such as carbon dioxide cycling, Affordability and availability. However, despite these benefits biofuels require crops such as corn or potatoes to produce, which in turn produce other environmental pollution. On the other hand, concerns have been raised as to whether the use of these fuels increases the amount of other pollutants, except for carbon dioxide, or not. Extensive researches in this field by experimental,... 

    Simulation of Blood Flow Subjected to Magnetic Field

    , M.Sc. Thesis Sharif University of Technology Aalizadeh, Farhad (Author) ; Moosavi, Ali (Supervisor) ; Shafie, Mohammad Behshad (Supervisor)
    Abstract
    Considering the fact that there is a blood flow inside the vessels it is possible that blood flow is always associated with fouling and this may decrease the blood flow when a blood vessel is injured, the cells of your blood bond together to form a blood clot. The blood clot helps you stop bleeding. Blood clots are made of a combination of blood cells, platelets (small sticky cells that speed up the clot-making process), and fibrin (protein that forms a thread-like mesh to trap cells). Doctors call this kind of blood clot a “thrombus.” We study the effects of different parameters on the deposition of Nanoparticles on the surface of a bump in the blood vessels by the magnetic field. The... 

    Optimization of Multi-Layered PCM Arrangement for Battery 18650 Thermal Management

    , M.Sc. Thesis Sharif University of Technology Pakravan, Shayan (Author) ; Aryanpour, Masoud (Supervisor) ; Shafie, Mohammad Behshad (Supervisor)
    Abstract
    Lithium-ion batteries have the ability to store a significant amount of energy and work at high power, which has led to the wide spread of their use in various industries. In high-power applications, battery heat management increases lifespan, safety, and reduces battery power loss. In this study, the heat management of a very common and widely used 18650 battery using multi-layered phase change material has been investigated. The reason for using multiple layers is that each phase change material has its own weaknesses in addition to its advantages. It is expected that with the proper use of several phase change materials in the thermal management system, the materials will reduce the... 

    Latent Heat Energy Vapor Storage in Phase Change Materials in Solar Stills

    , M.Sc. Thesis Sharif University of Technology Khalilmoghadam, Pooria (Author) ; Rajabi, Abbas (Supervisor) ; Shafie, Mohammad Behshad (Supervisor)
    Abstract
    Providing fresh water, ending fossil fuels, using renewable energy and achieving a clean biological environment in different parts of the world especially in Iran beside having access to many saline water sources, Shows the need for research in the field of solar still desalination. The goal of current study is to increase the performance of the solar still system through the use of an energy storage system and an additional condenser. Adding an additional condenser to a conventional solar still lead to an increase in the rate of evaporation and consequently increase the production of the system. Also, by collecting distilled water from the sidewalls, the amount of water produced... 

    The Role of Symmetry in Quantifying Information

    , M.Sc. Thesis Sharif University of Technology Jabbari, Ghazal (Author) ; Shafie, Afshin (Supervisor)
    Abstract
    In this thesis we want to discuss about a new approach about information. Using this approach, Scott Muller builds his formalism on two basic concepts: distinguishablity and symmetry. His claim is that there is an inverse relation between symmetry and information. It means that if we have a symmetric system we need less information (Than an asymmetric system) to describe it. Here, we are going to explore the role and significance of symmetry in probabilistic distributions of the double-slit experiment, and we want to show if there is a predetermined relation between symmetry and information or not.
     

    Finite-Control-Set Model Predictive Control for Doubly Fed Induction Generator of a Floating Offshore Wind Turbine

    , M.Sc. Thesis Sharif University of Technology Shafie, Hossein (Author) ; Sadati, Naser (Supervisor)
    Abstract
    The purpose of this project is designing a controller for a floating offshore wind turbine to exctract maximum power from wind energy in the first operating region of wind turbine. The NREL 5 MW OC3-Hywind floating wind turbine with BARGE platform will be used for this project. By using Turbsim software, proper wind profile for the first operating region of wind turbine will be produced. This profile will be excecuted for the FAST software that is simulates the mechanical part of wind turbine. By implementing the doubly fed induction generator in Simulink enviroment and designing the controller for doubly fed induction generator, the desired torque for maximizing the exctraction power of... 

    Determining Informative Content based on Customer Needs Using Deep Learning on Customer Reviews

    , M.Sc. Thesis Sharif University of Technology Shafie, Amir Hossein (Author) ; Najmi, Manoochehr (Supervisor)
    Abstract
    Right from the start, customer need has been the center of focus for every firm. It’s hard to find a single firm which is not focused and customer centric. Firms are spending millions of dollars every year to make customer surveys and interviews to find out customer needs, new product development and brand perceptions. After the invention of the internet and the rise of home computers people started to act differently. Most of the purchases went online and customer reviews flooded over the internet. They freely express their mind on websites which is a rich resource for market researchers and marketing firms. UGC is rich enough to analyze customer’s thoughts and needs. The volume of UGC has... 

    Quantum Aspects of The Origin of Life

    , M.Sc. Thesis Sharif University of Technology Khezr Seddigh Mazinani, Shobeir (Author) ; Shafie, Afshin (Supervisor)
    Abstract
    Many have claimed that quantum mechanics is playing a non-trivial, i.e. further from merely governing atomic and molecular realm, in living. If so, clearly quantum mechanics should have played a key role in the origin of life especially in the transition from chemical evolution to biological (Darwinian) evolution. Long before quantum aspects of living systems came to focus, It was known that all the amino acids are right handed and all the sugars are left handed in living systems. Bio-molecules having the same sense of chirality, i.e. optical activity, are called biohomochirality. Detailed studies on the structure and functioning of biomolecules buttressed the idea that the selection of... 

    Impact of voltage violation penalty cost on distribution system operation considering electric vehicle

    , Article 2023 International Conference on Future Energy Solutions, FES 2023 ; 2023 ; 979-835033230-8 (ISBN) Ebrahimi, M ; Ebrahimi, M ; Laaksonen, H ; Shafie-Khah, M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2023
    Abstract
    In the future, the widespread adoption of electric vehicle parking lots (EVPLs) may introduce operational challenges like voltage limit violations in distribution networks. However, EVPLs can potentially relieve these voltage limit violations by acting as flexible loads and providing reactive power support. In this paper, the impact of EVPLs on the optimal operation of the distribution network is investigated with a focus on their potential capability for reactive power support in a scenario that the distribution system operator (DSO) is committed to pay a penalty cost to customers if voltage limits are violated. Our results show that flexible charging of Electric Vehicles (EVs) and reactive... 

    Fluorescent Sensor from N-doped Carbon Quantum Dots for Detection of Hg2+ and I- Ions in Environmental Water

    , M.Sc. Thesis Sharif University of Technology Shafie, Saeedeh (Author) ; Samadfam, Mohammad (Supervisor) ; Sadjadi, Sudehsadat (Co-Supervisor)
    Abstract
    In this thesis, nitrogen-doped carbon quantum dots were synthesized from anhydrous trisodium citrate and arginine in water solvent by the hydrothermal method, which was used to develop an on-off-on fluorescence sensor. The hydrothermal method is a suitable method for the synthesis of nitrogen-doped carbon quantum dots due to its affordability, availability, rapidity, and safety. Characterization of nitrogen-doped carbon quantum dots was divided into two parts: in the first part, optical properties were investigated using fluorescence photoluminescence (PL) spectrometer and ultraviolet-visible spectrometer (UV-Vis), and in the second part, Fourier transform infrared spectrometry (FTIR),... 

    EV-observing distribution system management considering strategic VPPs and active & reactive power markets

    , Article Applied Energy ; Volume 364 , 2024 ; 03062619 (ISSN) Ebrahimi, M ; Ebrahimi, M ; Shafie-khah, M ; Laaksonen, H ; Sharif University of Technology
    2024
    Abstract
    The growing deployment of new flexible resources, renewable energy resources (RES), and Electric Vehicles (EV) in the distribution system necessitates new methods to manage the distribution system operation optimally. In this regard, our paper, by deploying the concept of Virtual Power Plants (VPPs) as the aggregation of multiple agents and local power markets that are known as important tools for future power systems presents a management framework for the distribution systems with high penetration of EVs. To this end, the interaction of the DSO and VPPs is studied based on their strategic behaviour through the local active and reactive power markets. This way, a bilevel optimization... 

    The Analysis of Total Productive Maintenance Based on Computerized Maintenance Management System

    , M.Sc. Thesis Sharif University of Technology Behshad, Amir (Author) ; mostafavi, mostafa (Supervisor)
    Abstract
    The main purpose of this thesis is to analyze the total productive maintenance based on computerized maintenance management system. At first, a detailed study on total productive maintenance is performed and then the requirements of this maintenance strategy are specified. Also, a computerized maintenance management system is defined which can help total productive maintenance to reach to its requirements. Finally, a conceptual model and entity-relationship model for computerized maintenance management system data base has been created  

    Experimental Study of Microbubbles Generation as a Contrast Agent in Blood, to Determine the Blood Flow by Echo-PIV Method

    , M.Sc. Thesis Sharif University of Technology Salari, Alinaghi (Author) ; Shafiee, Behshad (Supervisor)
    Abstract
    Today microbubbles are broadly used as ultrasound contrast agents. These bubbles enhance the image resolution of B-mode pictures. Flow focusing in microchannels could provide us the goal of one-size bubbles generation. Microbubbles could use as tracers in Echo_PIV method to determine the velocity profile in main body vessels such as carotid. In this paper we introduce a new production method to fabricate a low-cost microchannel for preparing Microbubble contrast agents (less than 50 microns) by using some surface active agents and a viscosity enhancing material to obtain appropriate Microbubbles with desired life time and stability for any in vitro infusion for velocity measurement. By... 

    Impact of solar energy on the integrated operation of electricity-gas grids

    , Article Energy ; Volume 183 , 2019 , Pages 844-853 ; 03605442 (ISSN) Badakhshan, S ; Hajibandeh, N ; Shafie khah, M ; Catalão, J. P. S ; Sharif University of Technology
    Elsevier Ltd  2019
    Abstract
    Photovoltaic energy is one of the clean and efficient energies which has been developing quickly in the last years. As the penetration of solar plants is increasing in the electricity network, new problems have arisen in network operation. This paper models a high penetration factor of solar energy in the electricity network and investigates the impact of solar energy growth on both the generation schedule of different power plants and in the natural gas transmission network. Fuel management of gas power plants is modeled through simulation of the natural gas transmission network. To this end, an increase in the penetration of solar energy in the electricity network inevitably leads to a... 

    An iterative auction-based method for multi energy trading in a microgrid considering renewable energy uncertainties

    , Article Electric Power Systems Research ; Volume 232 , 2024 ; 03787796 (ISSN) Ebrahimi, M ; Ebrahimi, M ; Fallah, A ; Shafie Khah, M ; Laaksonen, H ; Sharif University of Technology
    2024
    Abstract
    Due to the significant strides made in renewable energy generating units, they are now an appealing choice for supplying energy with various benefits. Furthermore, the aggregation of different energy generators and resources and the rise of energy conversion facilities, like combined heat and power (CHP), have paved the way for a new category of multi-energy prosumers. This research presents an innovative model for a local energy market structure consisting of an aggregator, prosumers, electricity, gas, and heat utility grids, and consumers. The interplay between these entities is handled as an auction model with proposed bidding strategies in which each player participates to maximize their... 

    Enhancing voltage profile in islanded microgrids through hierarchical control strategies

    , Article Electric Power Systems Research ; Volume 231 , 2024 ; 03787796 (ISSN) Dolatabadi, S.H.H ; Soleimani, A ; Ebtia, A ; Shafie khah, M ; Bhuiyan, T. H ; Sharif University of Technology
    2024
    Abstract
    This paper presents a novel approach aimed at enhancing the voltage profile of an islanded microgrid (MG) through the utilization of Phasor Measurement Units (PMUs) and a hierarchical control system for Distributed Generators (DGs). Recognizing the criticality of maintaining an optimal voltage profile for essential loads within an MG, we assume that PMUs are strategically placed across the MG based on existing placement methodologies to ensure the observability of load buses. The synchrophasor measurements captured by these PMUs are leveraged within an offline-designed tertiary control layer of the hierarchical framework, which in turn sets the voltage reference for the secondary control... 

    Fabrication and Experimental Investigation of Micro Heat Pipe Using Ferrofluid Under Magnetic Field

    , M.Sc. Thesis Sharif University of Technology Jahani, Nariman (Author) ; Shafii, Mohammad Behshad (Supervisor)
    Abstract

    On track to achieve heat transfer methods for small-scale, this research describes the design process of fabrication and experimental analysis of micro heat pipes with a rectangular section. First, the overview of micro-fluid systems and conventional mechanisms of heat transfer in these systems is discussed. Then, in order to describe the research theory and principles of heat pipe, various types of heat pipes micro scale and macro scaled are analyzed. After that, the method used for fabrication of a micro heat pipe without grooves is described. A new method for fabrication of MHP is investigated in this study. By using this method, one fiber glass board is fabricated by printed circuit... 

    Experimental and Theoretical Investigation of Microdroplet Breakup at Asymmetric T Junctions

    , M.Sc. Thesis Sharif University of Technology Samie, Milad (Author) ; Behshad Shafii, Mohammad (Supervisor)
    Abstract
    Symmetric T junctions have been used widely in microfluidics to generate equal-sized microdroplets, which are applicable in drug delivery systems. A newly proposed method for generating unequal-size microdroplets at a T junction is investigated theoretically and experimentally. Asymmetric T junctions with branches of identical lengths and different cross-sections are utilized for this aim. A novel equation for the critical breakup of droplets at asymmetric T junctions and one for determining the breakup point of droplets are developed. A good agreement was observed between the theories (novel and previous) and the experiments