Complexity matters: highly-accurate numerical models of coupled radiative-conductive heat transfer in a laser flash experiment

TL;DR

This paper emphasizes the importance of using highly accurate coupled radiative-conductive models for laser flash experiments to improve thermal diffusivity measurements, especially at high temperatures in oxide ceramics.

Contribution

It introduces detailed computational techniques for coupled radiative-conductive models, highlighting their significance over traditional unconstrained diathermic models.

Findings

Coupled models yield significantly different results at high temperatures.

Accurate implementation of computational techniques is crucial.

The study improves the reliability of thermal diffusivity measurements.

Abstract

Thermal diffusivity measurements of samples transmitting thermal radiation require adjustments to the data treatment procedures in laser flash analysis. Conventionally, an unconstrained diathermic model is used. Current results show that the alternative coupled radiative-conductive models produce substantially different results -- for instance, at high temperatures in oxide ceramics. However, care must be taken to ensure accurate implementations of each constituent computational technique. The latter are presented in this work.