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COBEM 2021
26th International Congress of Mechanical Engineering
AN EXPERIMENTAL TECHNIQUE FOR THE SIMULTANEOUS ESTIMATION OF THERMAL PROPERTIES OF METALS AS FUNCTIONS OF TEMPERATURE
Submission Author:
Sandro Metrevelle Marcondes de Lima e Silva , MG , Brazil
Co-Authors:
Mariana de Melo Antunes, Nícolas Pinheiro Ramos, Sandro Metrevelle Marcondes de Lima e Silva
Presenter: Mariana de Melo Antunes
doi://10.26678/ABCM.COBEM2021.COB2021-0683
Abstract
In this work, a simple experimental approach for the simultaneous estimation of temperature-dependent specific heat and thermal conductivity of metallic materials is presented. The thermal model developed is based on a one-dimensional, nonlinear and transient metal plate, which receives a constant heat flux at the top surface and is insulated at the bottom surface. The study is carried out in a 316 stainless steel sample. The inverse problem is solved by comparing temperature measurements from the sample with the numerical solution of the heat diffusion equation achieved in COMSOL software. The Levenberg–Marquardt method is applied for each time step of the experiment in order to simultaneously evaluate the thermal properties of the material for every slight change in temperature. By performing a sensitivity analysis, a priori information about the viability of the estimation can be obtained and the experimental aspects can be set. A reducing factor is considered on the experimental heat flux due to the imperfect contact between the heater and the metallic sample. In addition, the statistical study of the confidence intervals for each property and the comparison with the literature show the reliability of the outcomes. Lastly, the developed method is validated by analyzing the errors produced in the numerical and experimental processes.
Keywords
heat conduction, Inverse problem, temperature-dependent thermal properties, metals, Optimization
