ceyla ozgur

@atu.edu.tr

Adana alparslan türkeş science and technology university
Adana Alparslan Türkeş Science and Technology University



           

https://researchid.co/tayfun85

EDUCATION

Doctorate

RESEARCH, TEACHING, or OTHER INTERESTS

Renewable Energy, Sustainability and the Environment, Mechanical Engineering

16

Scopus Publications

Scopus Publications


  • Production of NiCoMo-Supported Ni Foam for Electrocatalytic Oxidation of Methanol: Experimental and RSM Analysis
    Başak Doğru Mert, Beyza Nur Demir, Cansu Edis, Şenay Akyıldız, Ceyla Özgür, and Mehmet Erman Mert
    Springer Science and Business Media LLC
    AbstractThe Ni-, Co-, and Mo-supported Ni foam (NiF–NiCoMo) was produced via galvanostatic method, and electrooxidation of methanol in alkaline medium was examined. The characterization was achieved using field emission scanning electron microscopy, energy-dispersive X-ray, and X-ray diffraction analysis. The electrochemical behavior was determined via cyclic voltammetry and chronoamperometry analysis. The contribution of each transition metal to electrocatalytic performance of NiF was monitored via mono, binary, and ternary modifications of each transition metal (Ni, Co, and Mo) for several amounts (5, 10, and 15 μg). Experiments were performed to determine the influence of catalyst amounts, methanol concentration, and scan rate parameters. The impacts of independent parameters on methanol electrooxidation were statistically investigated using Design-Expert software. The ability to analyze multiple parameters with a limited number of experimental performances is one of the method’s key benefits. The developed model showed that 9.41 and 14.03 µg catalyst amounts were the appropriate values for NiF–NiMo and NiF–NiCoMo achieving optimal circumstances, respectively.

  • Optimization of hydrogen production via electrocatalysis using NiCoMo-modified electrodes: An RSM approach
    Şekip Caner Esmerli, Ceyla Güngör, and Mehmet Erman Mert
    Informa UK Limited

  • Optimisation of exhaust emissions, vibration, and noise of unmodified diesel engine fuelled with canola biodiesel-diesel blends with natural gas addition by using response surface methodology
    Ceyla Özgür, Erinç Uludamar, Hakan Serhad Soyhan, and Raja Mazuir Raja Ahsan Shah
    EDP Sciences
    The paper presents methods to determine the optimum input parameters of CNG addition, biodiesel blend ratio, and engine speed to improve engine responses in terms of exhaust emissions, vibration, and noise of CNG-biodiesel-diesel fuelled engines. Box–Behnken based on response surface methodology was used to predict and optimise input parameters. Variance analysis was applied to determine the significant relationship between the input parameters and engine responses. At optimum input parameters (CNG addition = 9.24 L/min, biodiesel blend ratio = 40%, engine speed = 1524.24 rpm), the optimum engine responses of NOx, CO, CO2, O2, engine vibration acceleration, and noise were 93.77 ppm, 438.05 ppm, 1.47%, 18.59%, 37.17 m/s2 and 91.34 dB[A], respectively. In terms of coefficient determination of R2, the values were 99.11%, 99.22%, 99.41%, 99.70%, 98.65%, and 98.60% respectively. The correlation between the optimised result and the engine test result showed an acceptable error limit for NOx, CO, CO2, O2, engine vibration acceleration, and noise as 4.2%, 3.8%, 4.9%, 0.25%, 4.12%, and 0.17%, respectively.


  • 3D-Printed Antenna Design Using Graphene Filament and Copper Tape for High-Tech Air Components
    Emine Avşar Aydın, Mustafa Berkan Biçer, Mehmet Erman Mert, Ceyla Özgür, and Başak Doğru Mert
    SAE International


  • Optimization of biodiesel yield and diesel engine performance from waste cooking oil by response surface method (RSM)
    Ceyla Özgür
    Informa UK Limited
    Abstract The aim of this study is to investigate optimization of biodiesel production process and the effects of biodiesel–diesel fuel blends on engine performance and exhaust emission parameters by using response surface methodology. Transesterification method was used in biodiesel production. The importance of four process parameters namely molar ratio, catalyst amount, reaction temperature, and reaction time on biodiesel conversion rate is determined. For the optimization process Box–Behnken design (BBD) based on RSM was used. An optimum biodiesel yield was 93.124% was obtained at 6.05:1 methanol to oil molar ratio, 0.77 wt% catalyst amount, 62.75 °C reaction temperature and 72.63 min reaction time. Engine operating parameters such as blend ratio of biodiesel fuel and engine speed have been optimized to obtain optimum performance and exhaust emission values. The experiments were designed using central composite design method based on RSM. The results revealed that when the engine was operated with 1943.51 rpm engine speed and fueled with a 9.17% biodiesel ratio as the optimal conditions, responses were determined as 44.8097 kW, 245.946 Nm 5.17481%, 262.235 ppm, and 810.227 ppm for power, torque, smoke opacity, CO, and NOx, respectively.

  • Prediction of density and kinematic viscosity of biodiesel by artificial neural networks
    Ceyla Özgür and Erdi Tosun
    Informa UK Limited
    ABSTRACT Environmental pollution is one of the biggest issues all over the world. For this reason, researchers try to find alternative fuels for diesel engines, and biodiesel is the most profitable alternate fuel for diesel engines. In this study, biodiesel produced from cotton oil was used. The produced cotton oil biodiesel was mixed with diesel fuel at volumetric fraction of 20, 30, 40, 50, and 75%. Viscosity and density values at different temperatures for each fuel and blends were determined experimentally. Then, artificial neural network technique was used to predict viscosity and density. In this way, temperature and blend ratio were used as input for prediction of fuel properties. To train network, 85% of total data were used, and the remaining 15% of data were used to test prediction performance of structure. Results were compared with linear regression modelling. As a result, artificial neural network gave more accurate results than linear regression and can be suggested as good a prediction method.

  • The Potential of Microalgal Biodiesel in Turkey
    G. Tüccar, C. Güngör, E. Uludamar, and K. Aydin
    Informa UK Limited
    Turkey has limited petroleum reserves which causes the country to become a foreign dependent in respect to energy. As a result, the dependency level of Turkey on foreign fossil fuel suppliers reaches around 70%. Biodiesel, which has a more favorable combustion emission profile, relatively high flash point, and good lubrication properties, can be an effective alternative energy source. However, to provide the necessary amount of oil from agricultural products may affect food production and require a high amount of water and fertilizer. With their high oil content and high productivity rates, microalgae seems to be the best source of fuel which can replace petroleum products totally. This article introduces methods of microalgae production and discusses the potential of Turkey to pass microalgal biodiesel technology.

  • Effect of nanoparticle additives on NO<inf>x</inf> emissions of diesel fuelled compression ignition engine
    Tayfun Ozgur, Gökhan Tuccar, Erinç Uludamar, Ali Can Yilmaz, Ceyla Güngör, Mustafa Ozcanli, Hasan Serin, and Kadir Aydin
    Inderscience Publishers
    The amount of emitted harmful emission gases increases in parallel with increasing energy consumption. This increase has forced many countries to take various precautions and various restrictions on emitted emissions have been carried. In this study, effects of addition of oxygen containing nanoparticle additives on NOx emissions of diesel fuelled test engine were investigated. Nine different nanoparticle additives namely aluminium oxide (Al2O3), magnesium oxide (MgO), titanium oxide (TiO2), zinc oxide (ZnO), silicon oxide (SiO2), iron oxide Fe2O3, nickel oxide (NiO), nickel iron oxide (NiFe2O4) and nickel zinc iron oxide Zn0.5Ni0.5Fe2O4 were added to diesel fuel at the dosages of 25, 50 and 100 ppm. As a result, optimum additive and addition dosages were determined. Finally, the results showed that NOx emissions were decreased with the addition of nanoparticles.

  • Engine performance and emission characteristics of plastic oil produced from waste polyethylene and its blends with diesel fuel
    Ceyla Güngör, Hasan Serin, Mustafa Özcanlı, Selahattin Serin, and Kadir Aydın
    Informa UK Limited
    The overall objective of this study was to explore the utility of waste plastics as a potential source of diesel fuel. An experimental study was conducted to evaluate the use of various blends of plastic oil produced from waste polyethylene (WPE) with diesel fuel (D). WPE was degraded thermally and catalytically using sodium aluminum silicate as a catalyst. The oil collected at optimum conditions (414°C–480°C range and 1 h reaction time) was fractionated at different temperatures and fuel properties of the fractions were measured. Plastic oil was blended with diesel fuel at the volumetric ratios of 5%, 10%, 15%, 20%, and 100%. Fuel properties of blends are found comparable with those of diesel fuel within the EN 590 Diesel Fuel standard and they can also be used as fuel in compression ignition engines without any modification. Engine performance and exhaust emission studies of 5% WPE-D (WPE5) blend were performed. Experimental results showed that carbon monoxide (CO) emission is decreased by 20.63%, carbon dioxide (CO2) emission is increased by 3.34%, and oxides of nitrogen (NOx) emission is increased by 9.17% with WPE-D (WPE5) blend compared to diesel fuel.

  • Investigation of engine performance and emission characteristics of SI engine fuelled with ethanol blends by numerical simulation
    Ceyla Ozgur, Erdi Tosun, Tayfun Ozgur, Gökhan Tuccar, and Kadi̇r Aydin
    Trans Tech Publications, Ltd.
    In this study the influences of ethanol addition to gasoline on an spark ignition engine performance and emissions were explored. AVL BOOST software was used to simulate the performance and emission characteristics of different ethanol-gasoline blends. The blended fuels contain 5%, 10% and 15% of ethanol by volume, and indicated as B95E5, B90E10, and B85E15, respectively. The results showed that ethanol addition to gasoline fuel improve combustion process, decrease CO emissions and reduce BSFC of the SI engine.

  • Numerical studies of engine performance, emission and combustion characteristics of a diesel engine fuelled with hydrogen blends
    Tayfun Ozgur, Erdi Tosun, Ceyla Ozgur, Gökhan Tuccar, and Kadir Aydın
    Trans Tech Publications, Ltd.
    In this study the performance, exhaust emission characteristics and combustion process of the engine fueled with hydrogen-diesel blends were compared to diesel fuel. Hydrogen was blended with diesel fuel at the volumetric ratios of 5%, 10% and 20%. AVL BOOST software was dedicated to simulate the performance and emission values for various blends of hydrogen with diesel fuel. The simulation results showed that hydrogen addition to diesel fuel improve both engine performance and exhaust emmisions.

  • Investigation of effects ofinlet boundary conditions on the flow behaviour in a diesel injector
    Gökhan Tuccar, Tayfun Ozgur, Erdi Tosun, Ceyla Ozgur, and Kadi̇r Aydin
    Trans Tech Publications, Ltd.
    Diesel engines become popular from this point of view because of their high thermal efficiency. However, new and developing technologies are expected to lower their emission levels. Atomization of the fuel has a vital importance in order to control heat release rate and exhaust emission during combustion. With the known injection devices, atomization of the fuel is realized with high pressure systems such as common rail direct injectors (CRD) which operate at pressures exceeding 1300 bar. However, atomization of the fuel by simply increasing injection pressure can create cavitation erosion which may lead to mechanical failure of the nozzle. Utilization of air in diesel engine injectors will increase fuel atomization, provides more complete combustion of any diesel fuel consumed, enhance fuel economy and results in lower engine emissions. Therefore the aim of this study is to design a special injection device for use in a diesel engine which improves combustion by mixing air and fuel inside itself at optimum ratio. Proper air inlet pressure was determined for favorable diesel air mixing by investigation of the flow behavior in a newly designed injection device with the help of computational fluid dynamics based software. Three different air inlet pressures (20, 30 and 40 bar) are simulated and the contours of turbulence intensity, velocity and volume fraction of diesel fuel are discussed, and compared with each other.

  • Biodiesel fuel specifications: A review
    M. Ozcanli, C. Gungor, and K. Aydin
    Informa UK Limited
    This article is a literature review on biodiesel fuel specifications. Various methods were also studied by researchers in the production of biodiesel. The study is focused on the fuel specifications of alkali catalyst transesterified biodiesels from different raw materials, and it is based on the reports of more than 60 scientists who published their results previously. Studies are continuing to find out the best quality esters under different transesterification circumstances. Changing the production conditions makes the fuel specification results variable. While production, performance, and emission study reviews are available in the literature, there is no review on biodiesel fuel specifications based on detailed raw materials. It is thought that a literature review on fuel specifications will make a contribution to the literature on alkali-transesterified biodiesel fuels of different raw materials. Fuel specifications that are commonly concluded, such as density, viscosity, cetane number, cold flow properties, flash point, and calorific value, were examined and reviewed from published articles. It is also found that more than 85% of published papers don't include extensive fuel quality reports according to ASTM 6751 and EN 14214.