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

Research output: Contribution to journalArticlepeer-review

Authors

  • Martin B. Østergaard
  • Manlin Zhang
  • Xiaomei Shen
  • Rasmus R. Petersen
  • Jakob König
  • Peter D. Lee
  • Yuanzheng Yue

Colleges, School and Institutes

Abstract

Glass foams are attractive thermal insulation materials, thus, the thermal conductivity (λ) is crucial for their insulating 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 using image-based modelling. We then used the simulated λ to develop a new analytical model to predict the porosity dependence of λ. The λ values of the glass foams when the porosity is within 40% to 95% 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.

Details

Original languageEnglish
Pages (from-to)85-92
Number of pages8
JournalActa Materialia
Volume189
Early online date1 Mar 2020
Publication statusPublished - 1 May 2020

Keywords

  • 3D image analysis, Glass foam, Porosity, Simulation, Thermal conductivity