Yazar "Bademlioglu, Ali Husnu" seçeneğine göre listele

Listeleniyor 1 - 7 / 7
  • Küçük Resim Yok
    Öğe
    Comprehensive Optimization of Selective Laser Melting Process Parameters for Microstructure, Density, Hardness, and Tribological Performance of Pure Copper
    (Int Inst Science Sintering (I I S S), 2024) Ozkan, Burcu Asli; Dilsiz, Yusuf; Kucukelyas, Burak; Sever, Ahmet; Bademlioglu, Ali Husnu; Kaboglu, Cihan; Uzunsoy, Deniz
    This study is concerned with the optimisation of the processing parameters for the selective laser melting (SLM) of pure copper. The influence of these parameters on the microstructure, density and mechanical properties of copper samples produced by SLM is investigated in detail. Taguchi analysis is used to assess the importance of key building parameters including layer thickness, laser spot size and hatch distance on density. In addition, ANOVA is used to describe the contribution of each parameter to the density. The results reveal that layer thickness is the most effective parameter on density with an impact rate of 88.86%. Contrary to this situation, it appears that the effect of laser spot size and hatch distance on the density is quite limited, with an impact rate of 2.57% and 0.10%, respectively. Optimum results, including a relative density of 95.4% and a hardness of 63 HV, are achieved under specific parameters: a layer thickness of 0.03 mm, a hatch distance of 110 mm and a laser spot size of 70 mu m. This study provides a valuable insight into SLM processing of pure copper and offers practical recommendations for optimising the parameters used.
  • Küçük Resim Yok
    Öğe
    Design and optimization of the hydrokinetic turbine blades using statistical approaches
    (Pergamon-Elsevier Science Ltd, 2026) Kale, Fatih Mehmet; Yilmaz, Naz; Bademlioglu, Ali Husnu; Sokmen, Kemal Furkan; Shi, Weichao
    In this study, the design and optimization of Horizontal Axis Hydrokinetic Turbine (HAHT) blades were carried out using statistical approaches. Taguchi and ANOVA analyses were employed as the statistical methods. Initially, experimental and detailed computational analyses were conducted to predict the hydrodynamic performance of a HAHT. Subsequently, Taguchi and ANOVA analyses were performed to investigate the effects of design parameters such as thickness ratio (t/c), pitch angle (phi) and twist angle (theta) on the hydrodynamic performance of HAHT blades for different r/R blade sections 0.4, 0.6 and 0.8, and the optimal design parameters were identified. The study aims to investigate the effect of the design parameters, which are the most important in HAHT designs, on the power coefficient (CP) and to obtain the maximum CP for the existing HAHT as a result of changes proposed by the Taguchi and ANOVA optimization method. For the optimal HAHT geometry, the CP increase is observed between 2 % and 6 % at different TSR values. As a result of the analyses, the maximum CP was obtained as 0.4499 for the optimal design parameters. Additionally, it was concluded that the pitch angle was the most influential parameter on CP. Overall, the optimized blade provided a maximum 6 % increase in CP at TSR 5 compared to the initial design, and the pitch angle affected more than 96 % of this improvement compared to other parameters.
  • Küçük Resim Yok
    Öğe
    Performance Optimization of Auxetic Structures on Energy Absorption of Cylindrical Sandwich Using Taguchi and ANOVA Methods
    (2023) Kaya, Onur; Bademlioglu, Ali Husnu; Kaboglu, Cihan
    High engineering requirements of shock absorbers have increased interest in auxetic materials, which have higher specific energy absorption performance compared to conventional solid absorbers. Last decade, many optimization studies were conducted to improve the energy absorption performance of auxetic tubular structures. Most studies focused on adding inner and outer shells to thin-walled auxetic tubular absorbers with different types of lattice structures to enhance energy absorption of the cylindrical sandwiches. There are limited studies on thicker-walled auxetic tubes and their related shell thicknesses to optimize performance. In this study, the thickness of the thicker-walled auxetic core thickness (1.2 mm, 1.6 mm, 2 mm), shell thickness (16 mm, 20 mm, 24 mm), and auxetic lattice structure (Re-Entrant Circular, SiliComb, and ArrowHead) were optimized to improve the specific energy absorption of cylindrical sandwiches. The Taguchi method was used to determine the optimum parameters for cylindrical sandwiches. In addition, the effect ratio of the parameters on the specific energy absorption was investigated using the ANOVA method. The energy absorption properties of the cylindrical sandwiches were determined using the drop-weight test. The highest specific energy absorption was obtained using a shell thickness of 1.2 mm and a core thickness of 16 mm using an SiliComb lattice. It was determined that the lattice geometry was the most effective parameter on the specific energy absorption of cylindrical sandwiches, with an effect rate of 61.62%.
  • Küçük Resim Yok
    Öğe
    Sustainable liquid hydrogen production: Comprehensive modeling and thermodynamic analysis of a geothermal-powered multifunctional system
    (Elsevier, 2025) Bademlioglu, Ali Husnu; Canbolat, Ahmet Serhan; Kaynakli, Omer
    In this study, a comprehensive, multifunctional system developed for the production of liquid hydrogen, utilizing geothermal energy, and consisting of an organic Rankine cycle (ORC), high-temperature electrolysis system, absorption refrigeration cycle, and precooled Linde-Hampson liquefaction system as subsystems, was modeled. The thermodynamic performance of the liquid hydrogen production system was investigated using alternative refrigerants (n-Hexane, R123, R245fa, R601) in the ORC at evaporator temperatures ranging from 100 degrees C to 150 degrees C. Energy and exergy analyses of the liquid hydrogen production system were performed, and the specific energy consumption (SEC) of the system was evaluated for different working parameters. The best operating conditions of the system were determined by comparing the amount of liquid hydrogen produced. Based on the evaporator temperature and refrigerant used in the ORC, the energy efficiency of the liquid hydrogen production system varied between 7.93 % and 10.53 %, while the exergy efficiency ranged from 24.07 % to 31.94 %. Additionally, it was found that the amount of liquid hydrogen obtained from the modeled system varied between 0.124 kg/s and 0.164 kg/s depending on the operating parameters. The decrease in SEC with increasing evaporator temperature suggested a potential improvement in system performance at higher temperatures. Specifically, as the evaporator temperature increased, the SEC of the system decreased by 22 % for n-Hexane and by 18 % for R245fa. This indicated that n-Hexane might offer greater energy efficiency at elevated temperatures.
  • Küçük Resim Yok
    Öğe
    Taguchi and CFD-based hydrodynamic performance investigations of diffuser-augmented hydrokinetic turbines
    (Pergamon-Elsevier Science Ltd, 2026) Kale, Fatih Mehmet; Yilmaz, Naz; Bademlioglu, Ali Husnu; Sokmen, Kemal Furkan; Shi, Weichao
    In recent years, interest in renewable energy technologies has been increasing as part of the effort to obtain clean energy. One of these technologies, Hydrokinetic Turbines (HKT), converts the kinetic energy of water flow into electricity. However, these turbines fail to reach the theoretically calculated power coefficient (CP). To overcome this issue, researchers are developing various diffuser designs to enhance efficiency. In this study, the effects of the parameters used in diffuser design (foil type, diffuser length, tip clearance, and angle of attack) on the CP were investigated using Taguchi analysis, and an optimum diffuser design was developed for the Horizontal Axis Hydrokinetic Turbine (HAHT) based on the obtained experimental results. For the validation study of HAHT and CP calculations of the Diffuser-Augmented Hydrokinetic Turbine (DAHT), the Computational Fluid Dynamics (CFD) method was employed. According to the results of the Taguchi analysis, it was determined that diffuser length is the most influential parameter on the CP. Additionally, it was found that the effect of tip clearance on CP is relatively limited compared to other parameters. For the optimum operating parameters, maximum CP value was calculated as 0.7006. Consequently, a 67 % increase in the CP of the existing HAHT was achieved.
  • Küçük Resim Yok
    Öğe
    Thermal management and fin characteristic optimization of an electronic power supply utilizing Taguchi and ANOVA methods
    (Pergamon-Elsevier Science Ltd, 2024) Bademlioglu, Ali Husnu; Karatas, Osman Bedrettin; Sokmen, Kemal Furkan; Yuruklu, Emrah
    In the rapidly advancing field of electronic power supplies, managing thermal performance is critical. This study focuses on optimizing fin geometries to enhance the thermal management of an amplifier used in car multimedia systems, utilizing Taguchi and ANOVA methods for both thermal and volumetric efficiencies. Analyses were conducted on the impact of five distinct fin parameters-fin gap, fin thickness, separated plate thickness, fin base thickness, and fin height-on the system's thermal behavior and the fin volume. Computational Fluid Dynamics (CFD) analyses were performed for 24 different configurations. These analyses showed significant potential for improvement in the original design, with optimizations leading to an 8.31% reduction in the amplifier temperature and a 51.91% reduction in the fin volume. The study identifies fin height as the most effective parameter on the amplifier temperature, with an effect rate of 57.26%, while fin base thickness showed the most significant effect on the fin volume, with an effect rate of 66.98%. These findings not only provide a basis for more efficient design but also offer predictive insights through formulated regression equations, thus reducing the dependency on extensive experimental setups.
  • Küçük Resim Yok
    Öğe
    Thermohydraulic Performance Optimization of Automobile Radiators Using Statistical Approaches
    (Asme, 2022) Canbolat, Ahmet Serhan; Bademlioglu, Ali Husnu; Kaynakli, Omer
    Automobile radiator which is one of the vital components used for engine cooling in vehicles is expected to provide higher thermal performance without changing the exterior dimensions of the radiator with the development of engine technology. This situation necessitates changes in both design and operating parameters in the currently used radiator. In the present study, all fundamental parameters affecting the thermal and hydraulic performance of an automobile radiator are evaluated and optimized with statistical methods. Optimization study is carried out using Taguchi and ANOVA methods for two specified objective functions (heat transfer and pressure drop). The order of importance and impact rates for each design and operating parameter, the best and worst working conditions in terms of both target functions are determined. Air velocity, air inlet temperature, coolant inlet temperature, and fin pitch are found to be the most effective parameters on the heat transfer with a contribution ratio of 88%. The best and worst working conditions are obtained for the heat transfer and under these working conditions, they are calculated as 43.68 kW and 1.63 kW, respectively. When the system is examined in terms of the pressure drop, the results show that the coolant flowrate and tube height have a great impact with a contribution ratio of 67.04% and 32.06%, respectively. Lastly, the maximum and minimum pressure drop within the studied operating condition range is determined as 20.68 kPa and 0.12 kPa, respectively.