期刊
JOURNAL OF NON-EQUILIBRIUM THERMODYNAMICS
卷 46, 期 4, 页码 403-411出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/jnet-2021-0033
关键词
non-Fourier heat conduction; size-dependent thermal conductivity; over-diffusive propagation
资金
- National Research, Development and Innovation Office (NKFIH) [FK 134277, K 124366]
- NRDI Fund
- Ministry for Innovation and Technology
- Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences
- New National Excellence Program of the Ministry for Innovation and Technology from the source of the National Research, Development and Innovation Fund [UNKP-20-3-II-PTE-624]
Understanding heat conduction phenomena beyond Fourier has been a long-lasting task. Recent studies have shown that heterogeneous materials with macro-scale size can exhibit thermal effects that cannot be modeled by the Fourier equation, known as over-diffusive propagation. This phenomenon, different from low-temperature observations, has been found in various samples such as metal foam, rocks, and composites. The study also reveals a size-dependent thermal behavior for both Fourier and non-Fourier situations, and proposes an empirical relation between Fourier and non-Fourier parameters based on experimental data for a more robust and reliable evaluation procedure in future experiments.
It is a long-lasting task to understand heat conduction phenomena beyond Fourier. Besides the low-temperature experiments on extremely pure crystals, it has turned out recently that heterogeneous materials with macro-scale size can also show thermal effects that cannot be modeled by the Fourier equation. This is called over-diffusive propagation, different from low-temperature observations, and is found in numerous samples made from metal foam, rocks, and composites. The measured temperature history is indeed similar to what Fourier's law predicts but the usual evaluation cannot provide reliable thermal parameters. This paper is a report on our experiments on several rock types, each type having multiple samples with different thicknesses. We show that size-dependent thermal behavior can occur for both Fourier and non-Fourier situations. Moreover, based on the present experimental data, we find an empirical relation between the Fourier and non-Fourier parameters, which may be helpful in later experiments to develop a more robust and reliable evaluation procedure.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据