Local measurement of thermal conductivity and diffusivity
Simultaneous measurement of local thermal diffusivity and conductivity is demonstrated on a range of ceramic samples. This was accomplished by measuring the temperature field spatial profile of samples excited by an amplitude modulated continuous wave laser beam. A thin gold film is applied to the samples to ensure strong optical absorption and to establish a second boundary condition that introduces an expression containing the substrate thermal conductivity. The diffusivity and conductivity are obtained by comparing the measured phase profile of the temperature field to a continuum based model. A sensitivity analysis is used to identify the optimal film thickness for extracting the both substrate conductivity and diffusivity. Proof of principle studies were conducted on a range of samples having thermal properties that are representative of current and advanced accident tolerant nuclear fuels. It is shown that by including the Kapitza resistance as an additional fitting parameter, the measured conductivity and diffusivity of all the samples considered agree closely with literature values. Lastly, a distinguishing feature of this technique is that it does not require a priori knowledge of the optical spot size which greatly increases measurement reliability and reproducibility.
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- The Ohio State Univ., Columbus, OH (United States). Mechanical and Aerospace Engineering Dept.
- Idaho State Univ., Pocatello, ID (United States). Nuclear Science and Engineering
- Publication Date:
- OSTI Identifier:
- Report Number(s):
Journal ID: ISSN 0034-6748; RSINAK
- Grant/Contract Number:
- Accepted Manuscript
- Journal Name:
- Review of Scientific Instruments
- Additional Journal Information:
- Journal Volume: 86; Journal Issue: 12; Journal ID: ISSN 0034-6748
- American Institute of Physics (AIP)
- Research Org:
- Idaho National Laboratory, Idaho Falls, ID (United States)
- Sponsoring Org:
- USDOE Office of Nuclear Energy (NE)
- Country of Publication:
- United States
- 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS thermal conductivity; metallic thin films; dispersion relations; gold; laser materials
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