高孔隙率碳泡沫热建模中的挑战
Challenges in the thermal modeling of highly porous carbon foams
AI总结：
本文利用Guyer-Krumhansl方程解析解评估两种开孔碳泡沫的热脉冲实验，发现高孔隙率并非非傅里叶“过扩散”行为的充分条件。
摘要：
热脉冲实验是测定热扩散率的一种著名方法。然而，对于非均质、高孔隙率材料，测量方法和评估方法都并不直接。本文聚焦于两种开孔碳泡沫，它们尺寸相同但孔隙率不同。近期实验表明，在这种复杂结构中可能存在一种被称为“过扩散”传播的非傅里叶行为。（连续介质）Guyer-Krumhansl方程是模拟这种瞬态热行为的有前景候选模型。为了获得可靠的评估以及由此得到可靠的热参数，我们采用了近期开发的一种新颖、先进的评估程序，该程序使用Guyer-Krumhansl方程的解析解。根据我们的观察，结果表明，仅存在高孔隙率对于非傅里叶行为而言是必要但不充分的。此外，上述非傅里叶效应依赖于孔隙率。然而，多孔样品也可以遵循傅里叶定律。这些数据为正确识别导致当前非傅里叶行为的特征传热机制及其相应时间尺度提供了基础。关键词：闪光实验、非傅里叶热传导、高孔隙率碳泡沫。
英文摘要：
The heat pulse experiment is a well-known method for determining thermal diffusivity. However, neither the measurement nor the evaluation methodologies are straightforward for heterogeneous, highly porous materials. In the present paper, we focus on two open-cell carbon foam types, differing in their porosity but having the same size. Recent experiments showed that a non-Fourier behaviour, called 'over-diffusive' propagation, is probably present for such a complex structure. The (continuum) Guyer-Krumhansl equation stands as a promising candidate to model such transient thermal behaviour. In order to obtain a reliable evaluation and thus reliable thermal parameters, we utilize a novel, state-of-the-art evaluation procedure developed recently using an analytical solution of the Guyer-Krumhansl equation. Based on our observations, it turned out that the presence of high porosity alone is necessary but not satisfactory for non-Fourier behaviour. Additionally, the mentioned non-Fourier effects are porosity-dependent. However, porous samples can also follow the Fourier law. These data serve as a basis to correctly identify the characteristic heat transfer mechanisms and their corresponding time scales, which altogether result in the present non-Fourier behaviour. Keywords: flash experiments, non-Fourier heat conduction, highly porous carbon foams.
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