Int. J. Metrol. Qual. Eng.
Volume 10, 2019
|Number of page(s)||8|
|Published online||12 December 2019|
Modelling of thermal effects in a slim tin fixed-point cell
Temperature and Humidity Laboratory, Instituto Nacional de Metrología de Colombia − INM, Bogotá D.C 111321, Colombia
2 Departamento de Ingeniería Química y Ambiental, Universidad Nacional de Colombia, Bogotá 11001, Colombia
* Corresponding author: firstname.lastname@example.org
Accepted: 18 November 2019
Slim fixed-point cells are an economic and suitable alternative for calibration of industrial platinum resistance thermometers, which are widely used in research and industrial applications. The most relevant disadvantage of slim cells is related with thermal effects produced by interactions between the cell and the furnace used for the realization of the fixed-points. This work presents the implementation of a two-dimensional numerical model that considers the transient heat transfer due to conduction, radiation and latent heat. The main goal was to evaluate different geometrical parameters in the design of slim fixed-point cells. Results show that thermal effects are mitigated when the annular distance between interior and exterior walls of the crucible is maximum, while the length of the cell and the thermo-well must be setup according to the temperature gradients in the furnace to avoid undesirable heat fluxes.
Key words: Slim fixed-point / modeling / thermal effects / ITS-90
© S.A. Carvajal et al., published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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