Emergence of non-Fourier hierarchies

TL;DR

This paper investigates non-Fourier heat conduction at room temperature through experimental, theoretical, and modeling approaches, highlighting size effects and proposing pseudo-temperature modeling as an interpretative tool.

Contribution

It introduces a comprehensive analysis of non-Fourier heat conduction phenomena at room temperature, including experimental validation, thermomechanical interpretation, and pseudo-temperature modeling.

Findings

Guyer-Krumhansl equation models room temperature non-Fourier heat conduction.

Size dependency is significant in non-Fourier heat transfer.

Pseudo-temperature modeling can replicate non-Fourier temperature histories.

Abstract

The non-Fourier heat conduction phenomenon on room temperature is analyzed from various aspects. The first one shows its experimental side, in what form it occurs and how we treated it. It is demonstrated that the Guyer-Krumhansl equation can be the next appropriate extension of Fourier's law for room temperature phenomena in modeling of heterogeneous materials. The second approach provides an interpretation of generalized heat conduction equations using a simple thermomechanical background. Here, Fourier heat conduction is coupled to elasticity via thermal expansion, resulting in a particular generalized heat equation for the temperature field. Both of the aforementioned approaches show the size dependency of non-Fourier heat conduction. Finally, a third approach is presented, called pseudo-temperature modeling. It is shown that non-Fourier temperature history can be produced by mixing different solutions of Fourier's law. That kind of explanation indicates the interpretation of underlying heat conduction mechanics behind non-Fourier phenomena.