A numerical model for a heat flux DSC: Determining heat transfer coefficients within a DSC

Abstract

The differential scanning calorimeter (DSC) is often used to determine the transition temperature and enthalpy change in alloys, and the accuracy of measurements is significantly affected by the details of the heat transfer within the DSC. A numerical programme has been developed to simulate the complete heat flow path within a DSC and to enable more accurate interpretation of the measured data. In the programme, heat exchange is calculated between various parts of the calorimeter, including the sample, reference, containers, thermocouples and furnace. By fitting measured data for a pure metal with known enthalpy and melting temperature, heat transfer coefficients between the various parts of a calorimeter can be determined through an iterative process. With the known heat transfer coefficients, accurate enthalpy change and transition temperature can be calculated from experimental data.