2018

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    Heat transfer augmentation in engineering thermal devices by incorporating nanofluid as heat transfer medium: An extensive review study
    (Department of Mechanical and Production Engineering, Islamic University of Technology, Board Bazar, Gazipur, Bangladesh, 2018-11-15) Ullah, Najeeb; Ahmad, Javaid
    To acknowledge the prominent significance of new generation heat transfer medium (Nanofluid) in current engineering era, we have demonstrated the extensive literature study to shed light on its every crucial aspect. Heat transfer enhancement in engineering thermal devices is carried out by incorporating Active and Passive techniques. Passive techniques such as modifying heat transfer surfaces, inclusion of obstacles, replacement of base fluid with various nanofluids etc. impart substantial role in augmentation of heat transfer performance. We have extensively elaborated the noteworthy impact of nanofluids on thermal performance of heat exchangers, automotive radiators, refrigeration and air-conditioning system, and solar thermal convection. Furthermore, downsides of nanofluid have also been elucidated while evaluating the various parameters such as increment of nanoparticles, geometric-size and shape of solid particles etc. on pressure drop and pumping power. To conclude, this thesis will impart noteworthy role in designing and availing desired heat transfer and pressure drop requirements in heat transfer devices.
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    Vibration Analysis of an Aircraft Wing
    (Department of Mechanical and Production Engineering, Islamic University of Technology, Board Bazar, Gazipur, Bangladesh, 2018-11-15) Shafiq, Jawad Bin; Arpo, Hasan Tariq; Sadman, Sakif; Daiyan, Ahammed Dilir
    The report deals with the structural design and modal analysis of wing in an aircraft. Many studies are being carried out for the design of the wings across the globe by the researches to strengthen the aircraft wings for steady and sturdy structures for dynamic conditions. The wing design involves its initial considerations and selection of air foil, area of the wing, wing loading characteristic and weight of the wing. In this project the aircraft wing structures are designed using 2024-T3 aluminum alloy material. Airfoil profile NACA 63-215 as root of the wing and airfoil profile NACA 64-412 as the tip of the wing are selected (as per the specification of mooney M20n aircraft). The generated wing profile is imported to SOLIDWORKS 2017. Modal analysis is carried out in ANSYS WORKBENCH by inputting the specification of the wing geometry and the material properties. The reason behind using modal analysis is to determine the natural frequencies for vibration characteristics of the wing structure. Modal analysis also shows the correlation of the stress, deformation of the corresponding mode of vibration. The main purpose of this report is to compare natural frequency & deformation, structural properties (maximum principle stress, Von mises Stress, Von mises strain etc) of an aircraft wing with different thicknesses.
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    Study of generation of electricity using wind turbine for IUT south hall residence
    (Department of Mechanical and Production Engineering, Islamic University of Technology, Board Bazar, Gazipur, Bangladesh, 2018-11-15) Mziarani, Abou Hanifa; Abdalla, Abdirazak; Abubakar, Aayyad
    For as long as we remember the world source of energy evolved around fossil energy which are limited, expensive and above all are a source of danger to both mankind and its surrounding. This report main focus is to present an alternative source of energy to the Islamic university of technology, (IUT) in the hope of reducing not only the energy cost but mostly to reduce harmful substance into the environment. This rapport in one hand gives an introduction of the study where there is the background of the study, the description of the different process involved, and we define the various components required to bring the study to a satisfactory end. In another hand this report present a daily estimation of the power consumption of south hall of residence of, (IUT). And finally, it consists of the derivation of the power equation of a wind turbine which we apply with the help of the various data found in the second part to find out the number of wind turbine would require to ensure the power supply of the south hall of residence of IUT.
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    Performance Optimization of Cricket Bat by Modification of Spine Profile Design
    (Department of Mechanical and Production Engineering, Islamic University of Technology, Board Bazar, Gazipur, Bangladesh, 2018-11-15) Shahmat, Rahman Raad; Hossain, Mohammad Saqif; Khan, Erfan Wares; Asif, Muhammad
    The rear spine of a cricket bat gives it a characteristic cross section structure. The sweet spot indicates the position on the bat where the deformation from impact is minimal, and from where the ball comes out with maximum velocity after rebound. By modifying the spine profile structure, the Sweet spot can be improved by increasing the stroke (decreasing the minimum deformation) and enhance the bat performance. The aim of this study was to design a new modified bat with an improved spine profile, and to compare it with the existing bats. As per the new international regulations that came into effect from September 28, 2017, the design of the bat was done without violating the rules set by ICC. The performance analysis and comparison of the bats were executed through simulation, using finite element modeling followed by modal analysis to determine the regions and magnitude of vibrational deformation using ANSYS Workbench.
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    Performance Analysis of Optimized Vortex Tube Generated Air as Coolant in Machining Process by CFD and FEA Method
    (Department of Mechanical and Production Engineering, Islamic University of Technology, Board Bazar, Gazipur, Bangladesh, 2018-11-15) Mubasshir, A A; Shafe, Anwar
    Coolants are used to negate or minimize the thermal stresses developed during any machining process. However, some environmental and health issues are associated with traditional coolant. Documented health issues include Cancer, Dermatitis, Respiratory irritation, Asthma and Hypersensitivity Pneumonitis. In this experimental study, the effect of Ranque-Hilsch vortex-tube generated cold air/hot air is observed in a machining process as a replacement for traditional liquid coolant. The optimum dimension for maximum energy separation is obtained by trial method using computational fluid dynamics (CFD). For available compressed air of 6-8 bar, the optimum dimensions and geometry of the vortex-tube are: length (L) 300 mm, tube diameter (D) 20mm, cold outlet diameter (dc) 6mm, inlet nozzle diameter (din) 5mm, angle of control valve (φ) 50 degree. Temperatures in the hot outlet and cold outlet are Thot= 33℃ and Tcold = 14℃ are observed in the CFD model. Optimized vortex-tube outputs are then used as input parameters in AdvantEdge 3D software for studying post-machining characteristics of the workpiece. The chief parameters representing the machining quality are stress developed in the tool and workpiece and chip thickness. Machining quality with vortex-tube supplied air, conventional coolant and no coolant are then compared.
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    Optimizing the length of Earth Air Tunnel Heat Exchanger based on CFD analysis
    (Department of Mechanical and Production Engineering, Islamic University of Technology, Board Bazar, Gazipur, Bangladesh, 2018-11-15) Mahmud, Saikot; Hamid, Sami
    Thermal performance of Earth Air Tunnel Heat Exchanger (EATHE) under steady operating conditions has been carried out considering in hot and dry region of Bangladesh using Computational Fluid Dynamics modeling. Effect of soil thermal conductivity and by changing air velocity operation of EATHE on thermal performance has been evaluated for different pipe length of EATHE using experimentally validated CFD. Simulation Results show that the steady thermal performance of EATHE is significantly dependent on thermal conductivity of the soil and velocity of air. Results show that the increase in flow velocity leads to change in thermal behavior of the pipe. The effect of soil thermal conductivity of EATHE on thermal performance has been also carried out for different pipe length of EATHE using experimentally validated CFD simulation. Maximum air temperature drop of 15.6, 17.0 and 17.3 K are observed for soil thermal conductivities of 0.52, 2 and 4 W m1 K1 respectively for 60 meter pipe. The thickness of the soil annulus beyond which no significant rise in temperature of soil observed is equal to the pipe diameter. Mainly in this paper, the effect soil thermal conductivity has been compared with different pipe length considering also the change in velocity of air. The optimization of pipe length has been also carried out from the experimental analysis based on validated CFD analysis.
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    Numerical Investigation of Mass Injection Approach for Mitigation of Erosion on Propeller from Cavitation
    (Department of Mechanical and Production Engineering, Islamic University of Technology, Board Bazar, Gazipur, Bangladesh, 2018-11-15) Chowdhury, Nasimul Eshan
    Cavitation in marine propeller is a common phenomenon and mitigate it is a demanding issue. In this regard, many studies have been carried out and some solutions have already been proposed. In fact, some of them are already in use. Air injection technique can be a new approach to this prevailing problem. The main focus of the current study is to construct a feasible numerical model that could suffice the approach and eventually use the model to investigate the effectiveness of this method. For this novel purpose, the k-ω SST turbulence model with the curvature correction and the Zwart cavitation model have been applied on the commercial CFD Code ANSYS. The combined model has been applied on a modified INSEAN E779a propeller. In case of light weight expandable mass, the method has been found very appealing. Besides, the model is robust enough to encompass the complexities of the cavitation phenomenon.
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    Numerical Analysis of Film Cooling on Gas Turbine Blades
    (Department of Mechanical and Production Engineering, Islamic University of Technology, Board Bazar, Gazipur, Bangladesh, 2018-11-15) Rohit, Rifat Bin Alam; Sultan, Zawad; Rahul, SK Tashowar Tanzim; Hridoy, Ibrahim Hossain
    Various papers and research works regarding film cooling performance were studied. Parameters, conditions and geometry factors that affect the film cooling effectiveness were analyzed. The objective was to see how modifications such as dual row of anti-vortex hole configuration, and diffuser shaped anti-vortex configuration affected the overall cooling effectiveness, when compared to the performance for the conventional single row of cylindrical holes. The basis of comparison was film cooling applied over a flat plate, and the resulting cooling effectiveness produced. The numerical study was executed on CFX package. Validation of the simulation technique was attempted with reference to the experimental works of A.K Sinha in “Film Cooling Effectiveness Downstream of a Single Row of Holes with Variable Density Ratio”.
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    Noise Cancellation for Small Type Generators
    (Department of Mechanical and Production Engineering, Islamic University of Technology, Board Bazar, Gazipur, Bangladesh, 2018-11-15) Mahdin, Saimum; Haque, Mahiul; Rafsan, Shafwat Kabir; Anjum, Tanvir; Rahman, Md.Tashrik
    A simple, effective design for enclosing portable generators to reduce the radiated noise is an idea that seems to be desired by the consumers in this market. This investigation is to determine the feasibility of producing such an enclosure for a generator. Several engineering aspects are incorporated in the design of the enclosure. The first, and probably the most paramount, are the acoustical effects of the enclosure itself. The investigation follows the theories for insertion loss of a close fitting enclosure. The thesis examines the system behaviour of a close fitting enclosure that most acoustic text books ignore and how the material stiffness, density and source-to-enclosure distance affect the insertion loss and effectiveness of the enclosure. Measured and theoretical sound pressure level around the generator before and after the application of the enclosure are presented using standards described by ISO standard 1344. The second important consideration for the enclosure design involves the heat transfer characteristics. The requirements of cooling air to the generator are discussed. Also presented are some acoustic design considerations to prevent any “direct line of sight” to any of the necessary openings which will help in the overall insertion loss. The use of an optimal engineering design technique is presented, demonstrating its strengths and weakness in this application.
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    Multi Objective Optimization of Turning Process Using Whale Algorithm
    (Department of Mechanical and Production Engineering, Islamic University of Technology, Board Bazar, Gazipur, Bangladesh, 2018-11-15) Tanvir, Mahamudul Hasan; Hussain, Afzal; Rahman, M.M. Towfiqur; Zishan, Khandoker; Ishraq, Sakib
    This work is the optimization of machining parameters in steel turning operation. In this study, the experimental work was carried out by turning Stainless Steel 304 by using carbide inserts. There were three main purposes of this study. First was to explain and demonstrate a systemic procedure to collect a combination of data of parameters and then apply when the turning operation is performed. The second was to find the optimal combination by using Optimization Algorithm- WOA and Grey Analysis. The main conclusion drawn from this study is that efficient turning operations can be performed on 304 SS which will save power and time.