Thermal conductivities of molten semiconductors (Si, Ge, GaSb and InSb) near their melting points are reviewed. Measured thermal conductivities show different values depending on measurement methods. This is mainly due to natural convection during measurements. In order to reduce this convection, two approaches can be considered; utilization of microgravity environment and magnetic field. Thermal conductivity measurements in micro-gravity, some of which were already carried out and the others in future, are also summarized in this review. Recent results of thermal conductivity measurement for mercury in a magnetic field are shown.
This report describes a thermophisical properties which were researched for solved the thermal problem on thermal power plant and for development of new thermal power plant of Japan. Investigated materials are scale deposit on boiler tube inner surface, boiler tube, gas turbine blade, fireproof materials and ceramics.
In this review, the studies on the effective thermal conductivity of dispersed materials which consist of substances with different thermal properties are discussed systematically comparing with author's papers and many other existing ones. The effectiveness of the factors affecting effective thermal conductivity is cleared by employing unit-cell model and random model. The estimation on the predicting equations are made by using previous measuement results.
Four Japanese Industrial Standars on testing methods (DSC, DTA and TG) for thermal properties of plastic materials were established as JIS K7120 (thermogravimetry), K7121 (transition temperatures), K7122 (heat of transitions) and K7123 (specific heat capacity). A back ground on the establishment of these JISs, a relationship between results of round robin tests for the testing methods and these JISs, and an outline of these JISs are described.
ISO·TC 163 (Thermal Insulation) is one of the 191 technical committees which belong to Technical Division 3 (architecture). In this TC international standardization of mesuring method, calculation method and insulation materials for buildings is proceeding. The outline of TC 163 is reported here.
This paper described the method of temperature with thermocouple as a typical measurment of temperature. Thermocouples are basic measurment of temperature, therefore in this article explained some important things, making of thermocouples, kinds of thermocouples, erros in the measurment and so on.
Ruby lasers usually employed in the laser flash method for measuring thermal diffusivity of various inorganic substances are known to have the inhomogeneous energy distribution and their particular spatial intensity structure significantly effects the quantitative accuracy of the resultant thermal diffusivity data in some cases. Random packed fiber bundle made of plastic optical fiber with plastic optical guiding rod has been developed for homogenizing the energy distribution in a laser beam on the specimen surface. The usefulness of this new device has been well approved by measuring the energy distribution and the thermal diffusivity of nickel disc.
Experiments have been carried out to measure the thermal conductivity of epoxy resins filled with several types of fillers. Effects of volume fraction, shapes, orientation of fillers on thermal conductivity of the resins are discussed Experimental data were compared with the results predicted by Maxwell, Fricke, Bruggeman and Jhonson equations. The shape of irregular particles are approximated to an ellipsoid. The predicted results by Bruggeman and Jhonson equations are in good agreement with the experimental data.