Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
DEVELOPMENT OF AN EXPERIMENTAL DEVICE FOR THERMAL DIFFUSIVITY IDENTIFICATION OF METALLIC ALLOYS USING A PERIODIC TEMPERATURE FIELD
Submission Author:
José Ricardo Ferreira Oliveira , MG
Co-Authors:
José Ricardo Ferreira Oliveira, Luiz Roberto Rocha de Lucena, Romulo Pierre Batista dos Reis, Carlos Jose de Araujo, Celso Rosendo Bezerra Filho
Presenter: José Ricardo Ferreira Oliveira
doi://10.26678/ABCM.ENCIT2018.CIT18-0444
Abstract
Thermophysical characterization of materials used in engineering is very important for realization of projects in a most areas of knowledge, where the phenomena linked to process of heat transfer have a great role. Thermal diffusivity is a very important thermophysical property in analysis of thermal energy diffusion problems. The objective of this work is the development of an experimental device for thermal diffusivity identification of metallic alloys, with operating principle based in Angstrom´s Method, which makes use of a periodic heat flow controlled by a power source, generating a periodic temperature field in the sample. The profiles of temperature field at certain points of the sample were captured by thermocouples, whose installation position in the sample are derived from the evaluating of sensitivity coefficients. Amplitude and phase of temperature-captured signals were obtained using graphic analysis software. A thermocouple is adopted as a reference. Ratio of the amplitude and phase lag between the thermal signals captured by the others thermocouples and by the reference thermocouple is therefore calculated. These results were inserted in mathematical models for thermal diffusivity identification. Samples used in this work were AISI 304 stainless steel and AISI 316 stainless steel. Thermal diffusivity values obtained for these materials, when compared with literature values, have a good agreement, within uncertainties range adopted.
Keywords
Angstrom's Method, Experimental device, thermophysical properties, Thermal Diffusivity, Periodic Temperature Field
