Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
THERMAL PROPERTIES ESTIMATION OF METALS USING DIFFERENT THERMAL MODELS
Submission Author:
Sandro Metrevelle Marcondes de Lima e Silva , MG , Brazil
Co-Authors:
Nícolas Pinheiro Ramos, Sandro Metrevelle Marcondes de Lima e Silva, Luís Felipe dos Santos Carollo
Presenter: Nícolas Pinheiro Ramos
doi://10.26678/ABCM.ENCIT2018.CIT18-0525
Abstract
This work presents two models for the simultaneous estimation of thermal conductivity, λ, and volumetric heat capacity, ρcp, in a sample of AISI 304 stainless steel. The thermal models used are based on a transient one-dimensional heat diffusion equation. Based on the analysis of the sensitivity coefficients, two different intensities of heat flux are used on the top surface. On the bottom surface, each model has a different condition: the first one has an insulation condition and the other one has a constant temperature condition. To estimate these properties, an error function is minimized by applying the Broyden-Fletcher-Goldfarb-Shanno (BFGS) algorithm. The numerical temperature is obtained by the solution of proposed thermal model using the Finite Difference Method with an implicit formulation. The simulated experimental temperature is obtained by the addition of residual in the numerical data. For both models, the estimated properties are in agreement with literature and presented differences around 9 %.
Keywords
thermal conductivity, volumetric heat capacity, simultaneous estimation, heat conduction, Optimization
