DOI: 10.1615/ICHMT.1985.AdvCourseMeasTechHeatMassTransf
ISBN Print: 978-0-89116-381-7
Simultaneous Measurement of the Thermal Properties of Phase-Change Material and Complex Liquids Using a Nonlinear Thermokinetic Model
SINOPSIS
We present a new method and an experimental device for the simultaneous measurement of the thermal conductivity, the specific heat and the latent heat of phase-change materials or of non-newtonian complex fluids. It is a method using a non-linear model. The temperature interval (T1,T2) is divided into several intervals (Ti, Ti+δТ). A steady state corresponds to each of them. This regime is used to measure the thermal conductivity λ(Ti + δT/2). The transcient regime between two stationary regimes is used to obtain the variation of the variation of the specific versus temperature by identification of parameter. The latent heat of melting is obtained in the temperature interval in which the two phases (liquid and solid) exist. We describe the automatic mode of operation and we show an example of results for a cytoparaffin for which melting occurs over a range of temperature and a pure substance with a latent heat of melting (n-octadecane) .