This work reports on an analysis of thermophysical properties (thermal conductivity, thermal diffusivity, and specific heat capacity) measurements of solids using dynamic methods. The influence of temperature measurement uncertainty on the parameter estimation uncertainty is studied using a leastsquares procedure. The standard and difference analyses are used for optimizing the experiment with respect to the data window or time interval of measurements. The analysis is applied to the extended dynamic plane source method, and the results of numerical computations are illustrated in the form of contour plots.

No abstract

No abstract

The paper reports on the measurement of thermophysical properties (thermal conductivity and diffusivity) of PMMA (polymethylmethacrylate). The theory of the dynamic plane heat source method and the experimental apparatus are discussed. Both the sensitivity coefficients and difference analysis are used for searching the time interval in which the measured data can be evaluated. Besides, the influence of the heater and heat losses from the lateral sides of the sample and also the influence of the noise are studied. The estimated measurement uncertainties are 3.6% for thermal conductivity and 2.7% for thermal diffusivity.

The authors proposed and experimentally verified a new method of measurements of thermal conductivity and thermal diffusivity of homogeneous and isotropic materials with thermal conductivities of <2 W · m −1 · K −1 . The theoretical model and the experimental arrangement of the method, referred to as the modified dynamic plane source method, are described. The influence of the floating temperature of the heat sink was analyzed and included into the evaluation. The method was both theoretically and experimentally compared with other transient methods, namely, transient plane source and extended dynamic plane source methods. Two different polymethylmethacrylate materials were measured at laboratory temperature using all three methods, obtaining results with coefficients of variation of <2 % and 5 % for the thermal conductivity and thermal diffusivity, respectively. In addition, the sensor calibration and the sources of measurement uncertainty are outlined.Keywords Modified dynamic plane source method · Polymethylmethacrylate · Thermal conductivity · Thermal diffusivity · Transient plane source method