A Study of the Relationship between the Dynamic Viscosity and Thermodynamic Properties of Palm Oil, Hydrogenated Palm Oil, Paraffin, and Their Mixtures Enhanced with Copper and Iron Fines
Dzindziora A. Dzienniak D. Rokita T. Wojciechowski J. Sułowski M. Nurkusheva S. Bembenek M.
April 2024Multidisciplinary Digital Publishing Institute (MDPI)
Materials
2024#17Issue 7
The article presents the results of phase transition studies in which the following substances and their mixtures were tested: 100% palm oil, 100% paraffin, 100% hydrogenated palm oil, 50% palm oil + 50% paraffin, 50% hydrogenated palm oil + 50% palm oil, 33% hydrogenated palm oil + 33% palm oil + 33% soft paraffin, 20% hydrogenated palm oil + 30% palm oil + 50% soft paraffin, 50% hydrogenated palm oil + 50% palm oil + copper, and 50% hydrogenated palm oil + 50% palm oil + iron. The measurements were carried out on a station for testing phase-change materials (PCMs) designed specifically for the analysis of phase changes. Viscosity values were also determined for the tested materials, and their potential impact on heat accumulation was assessed. The primary goal of the experiment was to determine some key thermodynamic parameters, including transition time, transition heat, specific heat, and dynamic viscosity at 58 °C. A one-way ANOVA test confirmed the statistical significance of minimum transition temperature, maximum transition temperature, and phase transition time, validating the reliability and utility of the results. The melting point, crucial for applications involving phase changes, was identified as an important factor. The careful selection of components allows for the customization of properties tailored to specific applications. A significant result is that the analyzed substances with higher specific heat values tend to have a higher average dynamic viscosity. The Pearson correlation coefficient of 0.82 indicated a strong positive association between the average dynamic viscosity and the heat of fusion of the substances examined. This suggests that changes in the heat of fusion significantly influence alterations in dynamic viscosity. Substances with higher specific heat values tend to exhibit higher average dynamic viscosity, emphasizing the direct impact of composition on viscosity.
palm oil , paraffin , PCMs , phase transition , phase-change materials
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Department of Manufacturing Systems, Faculty of Mechanical Engineering and Robotics, AGH University of Krakow, A. Mickiewicza 30, Krakow, 30-059, Poland
Departament of Mechinery Engineering and Transport, Faculty of Mechanical Engineering and Robotics, AGH University of Krakow, A. Mickiewicza 30, Krakow, 30-059, Poland
Department of Power Systems and Environmental Protection Facilities, Faculty of Mechanical Engineering and Robotics, AGH University of Krakow, A. Mickiewicza 30, Krakow, 30-059, Poland
Department of Physical Metallurgy and Powder Metallurgy, Faculty of Metals Engineering and Industrial Computer Science, AGH University of Krakow, A. Mickiewicza 30, Krakow, 30-059, Poland
Department of Organization of Transport, Traffic and Transport Operations, L. N. Gumilyov Eurasian National, University, Satbaev 2, Astana, 010000, Kazakhstan
Department of Transport Equipment and Technologies, S. Seifullin Kazakh Agrotechnical Research University, Zhenis 62B, Astana, 010011, Kazakhstan
Department of Manufacturing Systems
Departament of Mechinery Engineering and Transport
Department of Power Systems and Environmental Protection Facilities
Department of Physical Metallurgy and Powder Metallurgy
Department of Organization of Transport
Department of Transport Equipment and Technologies
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