Highly accurate photopyroelectric measurement of thermal diffusivity of vegetable oils |
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| Authors: | Dorin Dadarlat Camelia Neamtu Mihaela Streza Carmen Socaciu Constantin Bele Francisc Dulf |
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| Affiliation: | 1. National R&D Institute for Isotopic and Molecular Technologies, Cluj‐Napoca, Romania;2. Email:streza.mihaela@ gmail.com;5. University of Agricultural Sciences and Veterinary Medicine, Faculty of Agricultural Sciences, Cluj‐Napoca, Romania |
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| Abstract: | ![]()
High‐accuracy photopyroelectric measurements, in the thermal‐wave‐resonator‐cavity configuration, were performed in order to measure the thermal diffusivity of some vegetable oils. The high resolution (relative error ±0.5%) of the above method allows for the detection of small changes in the values of this dynamic thermal parameter. The accuracy of the results is mainly due to the possibility to precisely control the variation (30‐nm step) of sample thickness, a proper selection of the range of the thickness scan (2 µm < Lm < 4 µm ? 5 µm), and an iterative procedure of data analysis. A correlation between thermal diffusivity and the fatty acid composition (obtained via gas chromatography) is suggested for some fresh (sunflower, hemp, flax, and soybean) oils and for hemp oil exposed to a microwave field: Thermal diffusivity appears to be determined by the overall content of polyunsaturated fatty acids. |
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| Keywords: | Fatty acid Photopyroelectric calorimetry Thermal diffusivity Vegetable oil |
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