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Evaluation of Rheological and Lubrication Properties of Selected Alcohol Fuels

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  • Leszek Chybowski

    (Department of Marine Propulsion Plants Operation, Faculty of Marine Engineering, Maritime University of Szczecin, ul. Willowa 2, 71-650 Szczecin, Poland)

  • Wojciech Wójcik

    (Laboratory of Marine Propulsion Plants, Faculty of Marine Engineering, Maritime University of Szczecin, ul. Wały Chrobrego 1-2, 70-500 Szczecin, Poland)

  • Marcin Szczepanek

    (Department of Power Engineering, Faculty of Marine Engineering, Maritime University of Szczecin, ul. Willowa 2, 71-650 Szczecin, Poland)

Abstract

This article presents the results of a study on the rheological and lubricating properties of selected alcohol fuels. Methanol, ethanol, and 2-propanol are investigated, for which density, kinematic, and dynamic viscosity are determined at selected temperatures in the range of 15–60 °C. In addition, the water content of the studied fuels is determined. Based on the measurements, the coefficient of temperature change for density and the relative percentage decrease in kinematic viscosity with increasing temperature are calculated. Subsequently, regression models are built to describe the value of density and viscosity of the tested liquid alcohol fuels as a function of temperature. Next, the fuels under study are subjected to the evaluation of antiwear properties using a high-frequency reciprocating rig (HFRR). For each fuel, the corrected wear scar size WS 1.4 , which is a measure of lubricity, the average coefficient of friction, and the relative percentage decrease in oil FILM thickness during the conduct of the HFRR test under standardized conditions, are determined. The measurements are carried out at a standardized temperature of 25 °C in accordance with standardized methods for a time equal to 75 min. Due to the low lubricity of the tested fuels, additional tests are performed at a reduced time equal to 30 min. In this case, all fuels show a similar WS 1.4 value, which ranges from 384 μm for methanol through 422 μm for 2-propanol to 426 μm for ethanol. The wear marks on the samples after the execution of the test are used to draw additional qualitative conclusions about the lubricating properties of the tested alcohols. The results obtained are summarized, and possibilities for their use in further research are provided.

Suggested Citation

  • Leszek Chybowski & Wojciech Wójcik & Marcin Szczepanek, 2025. "Evaluation of Rheological and Lubrication Properties of Selected Alcohol Fuels," Energies, MDPI, vol. 18(5), pages 1-18, February.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:5:p:1038-:d:1596283
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    References listed on IDEAS

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    1. Calam, Alper & Ali, Radhwan & Solmaz, Hamit & Yücesu, H. Serdar, 2024. "An experimental evaluation of TiO2 nanoadditive for HCCI engines running on ABE fuel," Energy, Elsevier, vol. 313(C).
    2. Leszek Chybowski & Przemysław Kowalak & Piotr Dąbrowski, 2023. "Assessment of the Impact of Lubricating Oil Contamination by Biodiesel on Trunk Piston Engine Reliability," Energies, MDPI, vol. 16(13), pages 1-30, June.
    3. Yang, Shichen & Wan, Mingding & Shen, Lizhong & Wang, Zhengjiang & Huang, Fenlian & Ma, Yuting & Xiao, Yuhan, 2024. "Investigation of the impacts of regeneration temperature and methanol substitution rate on the active regeneration of diesel particulate filter in a diesel-methanol dual-fuel engine," Energy, Elsevier, vol. 301(C).
    4. Leszek Chybowski & Marcin Szczepanek & Konrad Ćwirko & Konrad Marosek, 2024. "Analytical Method for Determining the Viscosity Index of Engine Lubricating Oils," Energies, MDPI, vol. 17(19), pages 1-15, September.
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