Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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  • Book Part
    Ion-exchange membranes in non-microbial fuel cell systems
    (Elsevier, 2023) Jalilnejad Falizi,N.; Fakhraddinfakhriazar,S.; Güngören Madenoğlu,T.
    Increase in fossil fuel consumption and rapid industrialization over the past century have contributed significantly to global warming. Alternatives to fossil fuels are being sought. Fuel cells (FC) are one of the most promising new technologies for reducing emissions of CO2, CO, SOx, and NOx. The storage and conversion of energy is a critical link between energy production and consumption. There is a need for a more suitable option to store and exploit the green and renewable energies of the future, as traditional fossil fuels are inherently unsustainable energy storage media with finite reserves and pollution problems. Moreover, in light of pressing energy and environmental concerns, clean and efficient fuel use is necessary. FC is an electrochemical device that converts the chemical energy of a fuel and an oxidant into electricity, along with heat, water, and steam as byproducts. In this chapter, brief descriptions of the various types of FCs and their primary components are provided, along with a discussion of the relevant material issues. Then, the potential modifications to the presented FCs are presented. Finally, future trends and current challenges associated with nonmicrobial FCs are addressed. © 2024 Elsevier Inc. All rights reserved.
  • Article
    Citation - WoS: 8
    Citation - Scopus: 10
    Spray Analysis of Biodiesels Derived From Various Biomass Resources in a Constant Volume Spray Chamber
    (American Chemical Society, 2022) Ulu, Anılcan; Yıldız, Güray; Rodriguez, Alvaro Diez; Özkol, Ünver
    This research aimed to analyze the spray characteristics of various biodiesels, which have rarely been investigated in terms of spray analysis in the literature compared to fossil diesel. For this purpose, four different methyl ester-type biodiesels were produced from canola, corn, cottonseed, and sunflower oils. These feedstocks were selected due to their wide availability in Turkey and being among the significant resources for biodiesel production. Measured physical properties of biodiesel samples showed that biodiesel fuels had, on average, 1.7 to 1.9 times higher viscosities, 5.3 to 6.6% larger densities, and 37 to 39.1% higher contact angle values than the reference diesel fuel. Spray characteristics of all fuels were experimentally examined in a constant volume spray chamber under chamber pressures of 0, 5, 10, and 15 bar and injection pressures of 600, 800, and 1000 bar. All tested biodiesels performed, on average, 3 to 20% longer spray penetration lengths, 5 to 30% narrower spray cone angles, and 5-18% lesser spray areas than the reference diesel fuel under chamber pressures of 5 and 10 bar. No significant differences occurred at 15 bar ambient pressure between biodiesels and diesel. In addition, analytical and empirical predictions showed that biodiesels had around 21.2-35.1% larger SMD values and approximately 7% lower air entrainment.