Examination of Thermal Diffusivity Measurement Method of Sample in Contact with Transparent Plate by Flash Method Considering Thermal Radiation

Kazuya Hosono; Tsuyoshi Nishi; Hiromichi Ohta

doi:10.2963/jjtp.34.117

January 1, 2020Netsu BusseiOpen Access

Examination of Thermal Diffusivity Measurement Method of Sample in Contact with Transparent Plate by Flash Method Considering Thermal Radiation

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Key Points

To determine how contact with a rear-side transparent plate influences radiative heat flux and the accuracy of thermal diffusivity measurements using the flash method.
Modeled a two-layer system consisting of an opaque sample (layer 1) pulse-heated on its front surface in contact with a transparent backing plate (layer 2).
Calculated the radiative heat flux emitted from the rear of the transparent plate and analyzed the apparent thermal diffusivity using the standard half-time method without transparent plate corrections.
Thermal diffusivity can be measured within approximately 5% accuracy using the half-time method when the optical thickness of the transparent layer is about 0.1 or less.
Accurate determination requires keeping the product of the characteristic time ratio and heat capacity ratio between layers sufficiently small.
Because transparent layer distortion worsens over time, limiting analytical evaluation to roughly 1.5 times the sample's characteristic time minimizes measurement error.

Implication

Analytical study evaluates transparent plate thermal radiation effects during flash measurements, highlighting conditions needed for accurate thermal diffusivity determination.

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Cite This Study

Hosono et al. (2020) studied this question.

synapsesocial.com/papers/6a8c015ae066a6a97ec46491 https://doi.org/10.2963/jjtp.34.117

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Examination of Thermal Diffusivity Measurement Method of Sample in Contact with Transparent Plate by Flash Method Considering Thermal Radiation

Key Points

Implication

Abstract

Discussion

Cite This Study

Examination of Thermal Diffusivity Measurement Method of Sample in Contact with Transparent Plate by Flash Method Considering Thermal Radiation

Key Points

Implication

Abstract

Discussion

Cite This Study

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