Abstract
Aerodynamic levitation (ADL) is a widely used contactless technique for evaluating the thermophysical properties of molten materials. During data analysis, these molten samples are typically assumed to be bubble-free and to adopt an oblate spheroid shape. However, these assumptions have not been empirically validated. The presence of trapped bubbles and potential deformation at the bottom of the levitated sample, which is obscured from view by the levitation nozzle, can lead to an underestimation of the sample’s density. These factors could also interfere with the sample’s damped oscillation, thereby affecting the reliability of the measured surface tension and viscosity. Consequently, in this study, we address these issues by using smaller alumina samples to minimize sample deformation and by inspecting each sample’s cross-section after cooling for trapped bubbles. This approach enabled us to mitigate the impact of these potential distortions on the measured thermophysical properties of molten alumina. Our findings reveal that the density of dense molten alumina can be expressed as 2.917\(-\)1.228\(\times 10^{-4}\)(T-2327) [g \(\cdot \hbox {cm}^{-3}\)] from 1978 K to 2789 K. Additionally, between 2375 K and 2770 K, we determined the surface tension of alumina to be 0.632\(-\)2.310\(\times 10^{-5}\)(T-2327)[N \(\cdot \hbox {m}^{-1}\)] and the viscosity to be \(0.577e^{9.743 \times 10^{3}/\hbox {T}}\)[m \(\cdot\) Pa \(\cdot\) s].
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Data Availability
The datasets generated during and/or analysed during the current study are available from the corresponding author, Y. Sun, on reasonable request.
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This work was partially supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) Innovative Nuclear Research and Development Program Grant Number JPMXD0220354598.
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YO conceptualized the project and secured the necessary funding. YS drafted the main body of the manuscript. TT was responsible for data collection. YS and TT jointly analyzed the collected data, with YS also preparing all figures included in the manuscript. HM, SF, and YO oversaw the experimental work. TK, SK, FK, and YO offered constructive feedback on experimental procedures and contributed to data analysis. All authors participated in manuscript review.
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Sun, Y., Takatani, T., Muta, H. et al. Thermophysical Properties of Dense Molten \({\text{Al}}_{2}{\text{O}}_{3}\) Determined by Aerodynamic Levitation. Int J Thermophys 45, 11 (2024). https://doi.org/10.1007/s10765-023-03302-2
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DOI: https://doi.org/10.1007/s10765-023-03302-2