Step-wise transient method for analysis of thermal properties of materials Part 2. Experimental investigations

Publication date: Available online 13 August 2019Source: Thermochimica ActaAuthor(s): P. Koniorczyk, J. Zmywaczyk, M. WielgoszAbstractThe subject of the paper which is a continuation of part 1 are issues related to the implementation of the stepwise transient plane source method. Both the measuring device and the testing methodology were developed. Measurements of thermophysical properties k, a and cp of selected materials from the group of thermal insulating foams (polyurethanes, polystyrenes), organic glass polymers and metals, including high thermal conductivity ones, i.e. duralumin at one measurement, were carried out. The measurement time was on the order of a few to several hundred seconds. Procedures for calculating thermal effusivity b and thermal diffusivity a were illustrated. Parameters of the thin-layer heater used in the measurement system were studied, i.e. measurements of the resistance change of the heater in the function of the voltage of the power supply and examination of the heater homogeneity were performed using a thermal imaging camera. The method requires that the thermocouples should be mounted on the faces of the samples. According to authors, this is an advantage of the method, because it allows to limit the applied pressure of the measuring stack on the accuracy of materials thermophysical properties measurements, especially metals. The measurements confirmed the suitability of the method for testing the thermophysical parameters of different group...

Source: Thermochimica Acta - August 14, 2019 Category: Chemistry Source Type: research