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.

中文翻译：

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玻璃发泡的高速同步加速器 X 射线成像和热导率模拟

摘要 玻璃泡沫是一种极具吸引力的隔热材料，因此其热导率 (λ) 对其隔热性能至关重要。了解发泡工艺对于工艺优化至关重要。在这里，我们应用高速同步加速器 X 射线断层扫描来研究发泡过程中孔隙结构的变化，动态量化泡沫结构和孔隙率。研究结果可为玻璃泡沫的制造提供指导。3D 孔结构还用于使用基于图像的建模来计算确定玻璃泡沫的 λ。然后我们使用模拟的 λ 来开发新的分析模型来预测 λ 的孔隙度依赖性。