Effect of Sample-Shape Imperfection on Uncertainty in Measurements of the Thermal-Conductivity by the Laser-Flash Method
- Authors: Asach A.V.1, Isachenko G.N.1,2, Novotelnova A.V.1, Fomin V.E.1, Samusevich K.L.1, Tkhorgevskii I.L.1
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Affiliations:
- ITMO University
- Ioffe Institute
- Issue: Vol 53, No 6 (2019)
- Pages: 723-726
- Section: XVI International Conference “thermoelectrics and Their Applications–2018” (Iscta 2018,) St. Petersburg, October 8–12, 2018
- URL: https://journals.rcsi.science/1063-7826/article/view/206228
- DOI: https://doi.org/10.1134/S1063782619060022
- ID: 206228
Cite item
Abstract
The effect of the geometric shape of the samples on the uncertainty in measurements of the thermal conductivity coefficient of materials by the laser-flash method is investigated. A mathematical model simulating the process of measuring the thermal conductivity of samples made of graphite, Mg2Si0.4Sn0.6, and bismuth telluride by the laser-flash method is created in the Comsol Multiphysics software. Cylindrical samples with plane-parallel sides, samples shaped as a truncated cylinder, as well as parallelepiped-shaped samples with a square base are investigated. It is shown that the uncertainty in the measurements does not exceed 2% for the samples with plane-parallel sides and sizes up to 12.7 mm. For the samples shaped as a truncated cylinder with a diameter of 3 mm and at an inclination angle of φ = 1.5°, the measurement uncertainty does not exceed 3%. With increasing sample diameter and angle φ, the measurement uncertainty increases significantly.
About the authors
A. V. Asach
ITMO University
Email: vladdisslav.fomin@yandex.ru
Russian Federation, St. Petersburg, 197101
G. N. Isachenko
ITMO University; Ioffe Institute
Email: vladdisslav.fomin@yandex.ru
Russian Federation, St. Petersburg, 197101; St. Petersburg, 194021
A. V. Novotelnova
ITMO University
Email: vladdisslav.fomin@yandex.ru
Russian Federation, St. Petersburg, 197101
V. E. Fomin
ITMO University
Author for correspondence.
Email: vladdisslav.fomin@yandex.ru
Russian Federation, St. Petersburg, 197101
K. L. Samusevich
ITMO University
Email: vladdisslav.fomin@yandex.ru
Russian Federation, St. Petersburg, 197101
I. L. Tkhorgevskii
ITMO University
Email: vladdisslav.fomin@yandex.ru
Russian Federation, St. Petersburg, 197101