Effect of radiative heat loss on thermal diffusivity evaluated using normalized logarithmic method in laser flash technique
Source abstract
Abstract
Abstract The laser flash technique is a standard method to measure the thermal diffusivity of solid samples especially at high temperatures. To understand the reliability of thermal diffusivity evaluation at high temperature for solid samples with low-thermal-diffusivity values, we analyzed the effect of radiative heat loss using the logarithmic method. The results revealed that when the Biot number was 0.1, the deviation from the input thermal diffusivity value was approximately −1.6%. In addition, when an aluminum silicate (AS) sample was heated to 1,273 K, the maximum deviation was approximately −0.35%. In contrast, the difference between the input value and the thermal diffusivity evaluated by the halftime method when AS was heated to 1,273 K was approximately 2.38%. Thus, since the effect of radiative heat loss was found to be negligible, it is concluded that the normalized logarithmic method should be very useful for the thermal diffusivity analysis of low-thermal-diffusivity solid samples at high temperature.
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Research context
OpenAlex topics: Thermography and Photoacoustic Techniques · Thermal properties of materials · Thermal and Kinetic Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Institute of Quantum Beam Science, Graduate School of Science and Engineering, Ibaraki University , Hitachi , Ibaraki 316-8511 , Japan
Product Development Division, Photonic Component Business Group, NTT Electronics, Naka , Ibaraki 311-0122 , Japan
References (16)
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