On the solid state heat transport phenomena measurement Wärmeleitfähigkeitsmessungen im festen Zustand P. Kos ˇ tial 1, 2 , I. Špic ˇ ka 1 , Z. Janc ˇ íková 1 , V. Rusnák 1 The paper deals with theoretical and experimental aspects of lumped capacitance model (LCM) application for the study of heat transport in different materials. Pa- tented construction of the measuring chamber together with special software the fundamental features of which are presented here allows evaluating thermal con- ductivity k, specific heat capacity c p and thermal diffusivity α. Obtained results are in relatively very good agreement with those obtained from independent measurement or table values. Keywords: Thermal conductivity / specific heat capacity / diffusivity / measurement Schlüsselwörter: Wärmeleitfähigkeit / spezifische Wärmekapazität / Diffusionskoeffizient / Messung 1 Introduction Specific properties of materials demand a large spec- trum of measuring methods suitable for thermal parameters measurements. Some of them are based on a photoacoustic effect and they are described in [1]. The cooling of objects is often described by a law, attributed to Newton, which states that the tempera- ture difference of a cooling body with respect to the surroundings decreases exponentially with time. Such behaviour has been observed during many la- boratory experiments, which led to a wide accep- tance of this approach. However, the heat transfer from any object to its surrounding is not only due to conduction and convection but also due to radiation. The latter does not vary linearly with temperature difference, which leads to deviations from Newton’s law. A discussion of this topic is provided in work [2–4]. The work is devoted to a thermal engine model for which adheres to Newton’s cooling law during the heat transfer processes [5]. The thermal effi- ciency and its bounds at maximum output power are derived and discussed. The study consists of a numerical investigation of transient heat transfer in channel flow of an electri- cally conducting variable viscosity Boussinesq fluid in the presence of a magnetic field and thermal ra- diation [6]. The temperature dependent nature of viscosity is assumed to follow an exponential model and the system exchanges heat with the ambient fol- lowing Newton’s law of cooling. Specific properties of materials demand a large spectrum of measuring methods suitable for thermal parameters measurements. Some of them are based on a photoacoustic effect and they are described in [7]. Another group of experiments is based on the ap- plication of thermal impulse on the sample surface and its propagation through a sample. These impulse applications either have contact of the heat source with the sample or they are in a contactless (flash) Corresponding author: Pavel Kos ˇ tial, Department of Material Engineering, VŠB – Technical University of Ostrava, 17. listopadu 15, Ostrava, 708 33, Czech Republic, E-Mail: pavel.kostial@vsb.cz 1 Department of Material Engineering, VŠB – Techni- cal University of Ostrava, 17. listopadu 15, Ostrava, 708 33, Czech Republic 2 Institute of Physics, Faculty of Mining and Geology, VŠB – Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava, Czech Republic Mat.-wiss. u. Werkstofftech. 2015, 46, No. 11 DOI 10.1002/mawe.201400380 © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim www.wiley-vch.de/home/muw 1110