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Type: Artigo
Title: Experimental Identification of Thermophysical Properties in Heterogeneous Materials with Integral Transformation of Temperature Measurements from Infrared Thermography
Author(s)/Inventor(s): Knupp, Diego Campos
Naveira-Cotta, Carolina Palma
Orlande, Helcio Rangel Barreto
Cotta, Renato Machado
Abstract: Indisponível.
Abstract: This work deals with the experimental estimation of spatially variable thermal conductivity and diffusivity in heterogeneous media, with temperature measurements obtained via infrared thermography being used in the inverse analysis. The direct problem solution for a one-dimensional heat conduction experiment is analytically obtained via integral transforms, and the related eigenvalue problem is solved by the generalized integral transform technique. The inverse problem is handled by Bayesian inference through a Markov chain Monte Carlo algorithm. The functional representation and estimation is based on the eigenfunction expansion of the thermal conductivity and diffusivity themselves, and the unknown parameters become the corresponding expansion coefficients. The inverse analysis is performed on the transformed experimental temperature field instead of employing the actual local temperature measurements, thus promoting a significant data reduction through the integral transformation of the experimental measurements. A demonstration experiment is built involving partially heated thin plates made of bakelite and polystyrene, including a variable thickness plate to simulate spatially variable thermophysical properties.
Keywords: Heterogeneousmedia
Inverse problem
Bayesian inference
Markov chain Monte Carlo method
Infrared thermography
Integral transforms
Production unit: Núcleo Interdisciplinar de Dinâmica dos Fluidos
Publisher: Taylor & Francis
In: Experimental Heat Transfer
Volume: 26
Issue: 1
Issue Date: 16-Jan-2013
DOI: 10.1080/08916152.2011.631079
Publisher country: Brasil
Language: eng
Right access: Acesso Aberto
ISSN: 0891-6152
Appears in Collections:Engenharias

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