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Method of determining thermal diffusivity on the basis of measurements of linear displacements.

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Title: Method of determining thermal diffusivity on the basis of measurements of linear displacements.
Authors: Pawlik, Kamil1 (AUTHOR), Kucharczyk, Andrzej1 (AUTHOR) a.kucharczyk@po.edu.pl, Podpora, Michal2 (AUTHOR)
Source: Measurement (02632241). Apr2023, Vol. 211, pN.PAG-N.PAG. 1p.
Subjects: Thermal diffusivity, Length measurement, Displacement (Mechanics), Thermal conductivity, Specific heat, Measuring instruments
Abstract: [Display omitted] • Determination of the thermal properties of a material is possible by measuring only the shortening of the sample during cooling. • Determination of thermal diffusivity does not require monitoring of sample temperature changes or heat fluxes. • The proposed method allows to simultaneously determine the thermal diffusivity and the coefficient of thermal expansion. An innovative, relatively simple method of non-stationary determination of thermal diffusivity with the use of linear displacement measurements is proposed. This method is dedicated mostly to materials with an extensive internal structure (porous building materials, i.e. concrete, ceramics, wood, etc.), where the thermal parameters should take into account the heterogeneity of the structure (relatively large samples are required). The main difference between the proposed method and the methods known from the literature is that in order to determine the thermal diffusivity, it is only necessary to measure changes in the length of the sample during cooling or heating. This is an alternative to methods based on direct or indirect measurement of the surface temperature of the sample. The proposed method was tested on samples made of plexiglass. The obtained results were compared with the reference results obtained from measurements with the use of commercial measuring equipment (Netzsch HFM 446), which allows to determine the thermal conductivity coefficient and specific heat with high accuracy. Good agreement of the obtained results was obtained. The uncertainty analysis of the proposed method showed that it is at the level of 3 %, which is sufficient in the case of building materials. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:[Display omitted] • Determination of the thermal properties of a material is possible by measuring only the shortening of the sample during cooling. • Determination of thermal diffusivity does not require monitoring of sample temperature changes or heat fluxes. • The proposed method allows to simultaneously determine the thermal diffusivity and the coefficient of thermal expansion. An innovative, relatively simple method of non-stationary determination of thermal diffusivity with the use of linear displacement measurements is proposed. This method is dedicated mostly to materials with an extensive internal structure (porous building materials, i.e. concrete, ceramics, wood, etc.), where the thermal parameters should take into account the heterogeneity of the structure (relatively large samples are required). The main difference between the proposed method and the methods known from the literature is that in order to determine the thermal diffusivity, it is only necessary to measure changes in the length of the sample during cooling or heating. This is an alternative to methods based on direct or indirect measurement of the surface temperature of the sample. The proposed method was tested on samples made of plexiglass. The obtained results were compared with the reference results obtained from measurements with the use of commercial measuring equipment (Netzsch HFM 446), which allows to determine the thermal conductivity coefficient and specific heat with high accuracy. Good agreement of the obtained results was obtained. The uncertainty analysis of the proposed method showed that it is at the level of 3 %, which is sufficient in the case of building materials. [ABSTRACT FROM AUTHOR]
ISSN:02632241
DOI:10.1016/j.measurement.2023.112624