A New Efficient Formula for the Thermal Diffusivity Estimation from the Flash Method Taking into Account Heat Losses in Rear and Front Faces

Chihab, Yassine; Garoum, Mohammed; Laaroussi, Najma

doi:10.1007/s10765-020-02704-w

Cited by 9 publications

(2 citation statements)

References 36 publications

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“…between the experimental curve T exp (t) and the theoretical curve T mod (t) by the relation (14). The minimization of the sum is performed using the Levenberg-Marquardt algorithm.…”

Section: Resultsmentioning

confidence: 99%

“…Porous materials may contain air, which can interfere with the measurement of thermal conductivity by affecting heat propagation through the material. Secondly, the assumption of equal exchange coefficients between the front and back faces is contestable for a highly insulating or even super-insulating material, and separating these coefficients in the model generally leads to correlations with thermal properties that are therefore difficult to estimate separately [14]. The three-layer method is suitable only for low-density insulating materials, and is difficult to apply to materials with high conductivity.…”

Section: T Ambmentioning

confidence: 99%

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Numerical modeling of the asymmetric hot plate method considering lateral convective losses

Dia

Diallo

Faye

et al. 2023

Preprint

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In this study, a numerical model of the asymmetric hot plate method was developed to determine the thermal properties of materials. The proposed model considers the convective heat loss around the device. First, a numerical calculation code is developed to determine the temperature evolution at the measurement points. This calculation code is then used to perform a reduced sensitivity study on various parameters. The Levenberg-Marquardt algorithm was used to identify the thermal properties of different materials from the thermogram. The impacts of the convection coefficient h and insulation thickness on the calculation of the estimates were studied. Finally, an experimental study was conducted using several materials. The thermal properties were compared with experimental results obtained using other measurement methods. A satisfactory agreement was obtained.

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“…between the experimental curve T exp (t) and the theoretical curve T mod (t) by the relation (14). The minimization of the sum is performed using the Levenberg-Marquardt algorithm.…”

Section: Resultsmentioning

confidence: 99%

Section: T Ambmentioning

confidence: 99%