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    Bio-composite materials: a short review of recent trends, mechanical and chemical properties, and applications
    (2018) Yıldızhan, Şafak; Çalık, Ahmet; Özcanlı, Mustafa; Serin, Hasan
    Recently, the attraction on the bio-composite (known as green composites) materials has significantly increaseddue to the potential of being substitute to conventional materials used in manufacturing industries. Biocomposite materials are produced with natural fibers or natural resins instead of synthesized fibres (carbon,glass, etc fibers) or resins (poly vinyl alcohol, epoxy, etc resins ). The bio-based fibers such as jute, sisal, flax,hemp, bamboo, hair, wool, silk etc., are obtained from plants or animals. Also, natural matrix materials such asnatural rubber, polyester, etc., are produced from plants. The advantages of bio-composites such as the ease ofdisposal and being able to composted characteristics of bio-composites after the expiration date which is notgenerally possible with conventional synthetic materials, being renewable, sustainable have attracted manyresearcher. Furthermore, the comparable mechanical properties of bio-composites make feasible for applicationto many different products. This study reviews the, recent trends, mechanical and chemical properties, andapplication of bio-composites in recent years.
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    Comparison of transesterification and thermal cracking methods on fuel specifications of castor oil biodiesel
    (Elsevier Science Bv, 2017) Serin, Hasan; Akar, Mustafa Atakan; Yildizhan, Safak; Ekinci, Firat; Ozcanli, Mustafa
    [Abstract Not Available]
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    Energy and exergy analysis of biodiesel
    (Elsevier Science Bv, 2017) Ozcanli, Mustafa; Serin, Hasan; Calik, Ahmet; Celebi, Kerimcan; Akar, M. Atakan
    [Abstract Not Available]
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    Evaluation of Effects of Compression Ratio on Performance, Combustion, Emission, Noise and Vibration Characteristics of a VCR Diesel Engine
    (Int Journal Renewable Energy Research, 2018) Yildizhan, Safak; Uludamar, Erinc; Ozcanli, Mustafa; Serin, Hasan
    In this study, an experimental study has been evaluated on a variable compression ratio diesel engine to investigate the compression ratio effects on engine performance, combustion, emission, vibration, and noise characteristics. The result of engine characteristics were studied at 12:1, 14:1, and 16:1 compression ratios under partial load condition. Experimental engine was operated with diesel, biodiesel and diesel-biodiesel blends throughout the experiments. Experimental study indicated that compression ratio considerably affects the engine characteristics that measured in this study. It is observed that in the experiments, higher compression ratio results in higher brake thermal efficiency and thus lower specific fuel consumption. Higher compression ratios resulted with higher cylinder pressure and thus improved combustion. Increasing compression ratio improved carbon monoxide emission, however, increased carbon dioxide emission and nitrogen oxides formation. Also, noise and vibration of the engine reduced with the increment of compression ratio.
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    Evaluation of effects of compression ratio on performance, combustion, emission, noise and vibration characteristics of a VCR diesel engine
    (International Journal of Renewable Energy Research, 2018) Yildizhan, Şafak; Uludamar, Erinç; Özcanli, Mustafa; Serin, Hasan
    In this study, an experimental study has been evaluated on a variable compression ratio diesel engine to investigate the compression ratio effects on engine performance, combustion, emission, vibration, and noise characteristics. The result of engine characteristics were studied at 12:1, 14:1, and 16:1 compression ratios under partial load condition. Experimental engine was operated with diesel, biodiesel and diesel-biodiesel blends throughout the experiments. Experimental study indicated that compression ratio considerably affects the engine characteristics that measured in this study. It is observed that in the experiments, higher compression ratio results in higher brake thermal efficiency and thus lower specific fuel consumption. Higher compression ratios resulted with higher cylinder pressure and thus improved combustion. Increasing compression ratio improved carbon monoxide emission, however, increased carbon dioxide emission and nitrogen oxides formation. Also, noise and vibration of the engine reduced with the increment of compression ratio. © International Journal Of Renewable Energy Research, 2018.
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    Evaluation of vibration characteristics of a hydroxyl (HHO) gas generator installed diesel engine fuelled with different diesel-biodiesel blends
    (Pergamon-Elsevier Science Ltd, 2017) Uludamar, Erinc; Tosun, Erdi; Tuccar, Gokhan; Yildizhan, Safak; Calik, Ahmet; Yildirim, Sefa; Serin, Hasan
    There are two main reasons of alternative fuel search of scientists: environmental problems resulted from combustion of fossil fuels and limited reserves of crude oil. Biodiesel and Hydrogen (H-2) are two of the most promising alternative fuels with their environmental friendly combustion profiles. The aim of this study was to evaluate vibration level of a hydroxyl (HHO) gas generator installed and diesel engine using different kinds of biodiesel fuels. In this study, at different flow rates, the effect of HHO gas addition on engine vibration performance was investigated with a Mitsubishi Canter 4D34 -2A diesel engine. HHO gas introduced to the test engine via its intake manifold with 2, 4 and 6 L per minute (LPM) flow rates when the engine was fuelled with sunflower, canola, and corn biodiesels. The vibration data was collected between 1200 and 2400 rpm engine speeds by 300 rpm intervals. Finally, artificial neural network (ANN) approach was conducted in order to predict the effect of fuel properties and HHO amount on engine vibration level. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Using HHO (Hydroxy) and hydrogen enriched castor oil biodiesel in compression ignition engine
    (Pergamon-Elsevier Science Ltd, 2017) Ozcanli, Mustafa; Akar, Mustafa Atakan; Calik, Ahmet; Serin, Hasan
    Hydrogen and HHO enriched biodiesel fuels have not been investigated extensively for compression ignition engine. This study investigated the performance and emissions characteristics of a diesel engine fueled with hydrogen or HHO enriched Castor oil methyl ester (CME)-diesel blends. The production and blending of CME was carried out with a 20% volumetric ratio (CME20) using diesel fuel. In addition, the enrichment of intake air was carried out using pure HHO or hydrogen through the intake manifold with no structural changes with the exception of the reduction of the amount of diesel fuel for a naturally aspirated, four cylinder diesel engine with a volume of 3.6 L. Hydrogen amount was kept constant with a ratio of 10 L/min throughout the experiments. Engine performance parameters, including Brake Power, Brake Torque, Brake Specific Fuel Consumption and exhaust emissions including NOx and CO, were tested at engine speeds between 1200 and 2600 rpm. It is seen that HHO enriched CME has better results compared to pure hydrogen enrichment to CME. An average improvement of 4.3% with HHO enriched CME20 was found compared to diesel fuel results while pure hydrogen enriched CME20 fuel resulted with an average increase of 2.6%. Also, it was found that the addition of pure hydrogen to CME had a positive effect on exhaust gas emissions compared to that adding HHO. The effects of both enriched fuels on the engine performance were minimal compared to that of diesel fuel. However, the improvements on exhaust gas emissions were significant. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.