Simultaneous estimation of thermal properties via measurements using one active heating surface and Bayesian inference

Santos, José Wendel dos; Oliveira, José Ricardo Ferreira; Nascimento, Jefferson Gomes do; Fernandes, Ana Paula; Guimarães, Gilmar

doi:10.1016/j.ijthermalsci.2021.107304

Cited by 11 publications

(2 citation statements)

References 35 publications

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“…Evaluating material thermal properties has always been of great interest to researchers. Novel methods have been developed to measure properties such as material thermal diffusivity for various materials with different geometries [11]- [18]. One of the most popular methods is the half-rise equation developed by Parker et al [23].…”

Section: Introductionmentioning

confidence: 99%

A theoretical investigation into material characterisation using pulsed thermography in the reflection and transmission modes

Ali

Addepalli

Zhao

2023

Thermosense: Thermal Infrared Applications XLV

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Recent years have seen substantial growth of pulsed thermography as a popular non-destructive testing tool to characterise surface and near-surface defects for both metals and composites. The current research focus is on material characterisation to determine material thermal properties such as thermal diffusivity. However, most of these studies have focused on using the reflection mode of pulsed thermography where data is captured from the front wall of the specimen at which the heat flux is applied. The transmission mode, where the heat flux is applied on the front wall and data is acquired at the back wall, has not been investigated as comprehensively as the reflection mode. Research has indicated that the transmission mode is able to detect defects deeper into the specimen when compared to the reflection mode however, it has mainly been used as an indicator to detect defects and not to quantify the depth of subsurface defects within the specimen. This study develops a finite element model using the commercially available software COMSOL to investigate material characterisation using both the reflection and transmission modes of pulsed thermography. A finite element model of a thin steel plate was first created followed by the application of a heat flux to the front surface for the model. The solvers from the software were used to record the temperature variation on both the front and back surfaces. Results show that the thermal contrast curves on the backwall were less sensitive to changes in depth compared to changes in defect size. Furthermore, this study provides motivation for conducting a more in-depth study of the through transmission thermography to better understand its capabilities.

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Section: Introductionmentioning

confidence: 99%

A theoretical investigation into material characterisation using pulsed thermography in the reflection and transmission modes

Ali

Addepalli

Zhao

2023

Thermosense: Thermal Infrared Applications XLV

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show abstract

“…Direct problems are easy to solve but these are difficult if the nature is nonlinear and needs further investigation. Inverse problems as compared to direct problems are very interesting and few contributions are available in the literature [1][2][3][4]. The inverse source problems in heat transfer have been a concern for many researchers during the past decade years.…”

Section:  Introductionmentioning

confidence: 99%

A wavelet-based collocation technique to find the discontinuous heat source in inverse heat conduction problems

et al. 2022

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This paper is devoted to an inverse problem of determining discontinuous space-wise dependent heat source in a linear parabolic equation from the measurements at the ﬁnal moment. In the existing literature, a considerable accurate solution to the inverse problems with unknown space-wise dependent heat source is impossible without introducing any type of regularization method but here we have determine the unknown discontinuous space-wise dependent heat source acutely using Haar wavelet collocation method (HWCM) without applying the regularization technique. This HWCM is based on ﬁnite-diﬀerence and Haar wavelets approximation to the inverse problem. In contrast to other numerical techniques, in HWCM, we use Haar functions that create a well-conditioned system of algebraic equations. The proposed method is stable and convergent because the numerical solution converges to the exact solution without observing any diﬃculty. Finally, some numerical examples are presented to verify the validity of the HWCM for diﬀerent cases of source term.

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Heat flux in machining processes: a review

Figueiredo

Guimarães

Pereira

2022

Int J Adv Manuf Technol

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Simultaneous estimation of thermal properties via measurements using one active heating surface and Bayesian inference

Cited by 11 publications

References 35 publications

A theoretical investigation into material characterisation using pulsed thermography in the reflection and transmission modes

A theoretical investigation into material characterisation using pulsed thermography in the reflection and transmission modes

A wavelet-based collocation technique to find the discontinuous heat source in inverse heat conduction problems

Heat flux in machining processes: a review

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