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High-speed synchrotron X-ray imaging of glass foaming and thermal conductivity simulation

Østergaard, MB; Zhang, M; Shen, X; Petersen, RR; König, J; Lee, PD; Yue, Y; (2020) High-speed synchrotron X-ray imaging of glass foaming and thermal conductivity simulation. Acta Materialia , 189 pp. 85-92. 10.1016/j.actamat.2020.02.060. Green open access

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Abstract

Glass foams are attractive thermal insulation materials, thus, the thermal conductivity (λ) is crucial for their performance. Understanding the foaming process is critical for process optimization. Here, we applied high-speed synchrotron X-ray tomography to investigate the change in pore structure during the foaming process, quantifying the foam structures and porosity dynamically. The results can provide guidance for the manufacturing of glass foams. The 3D pore structures were also used to computationally determine λ of glass foams. We used the simulated λ to develop a new analytical model to predict the porosity dependence of λ. The λ values predicted by the new model are in excellent agreement with the experimental data collected from the literature, with an average error of only 0.7%, which performs better than previously proposed models.

Type: Article
Title: High-speed synchrotron X-ray imaging of glass foaming and thermal conductivity simulation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.actamat.2020.02.060
Publisher version: https://doi.org/10.1016/j.actamat.2020.02.060
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Glass foam, Thermal conductivity, 3D image analysis, Simulation, Porosity
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10093139
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