Abstract
Analyses were developed using a finite element method of the experimental measurement system for thermal conductivity of solid materials, used by the Centro Nacional de Metrología (CENAM), which operates under a condition of permanent heat flow. The CENAM implemented a thermal conductivity measurement system for solid materials limited in its operating intervals to measurements of maximum 300 ° C for solid conductive materials. However, the development of new materials should be characterised and studied to know their thermophysical properties and ensure their applications to any temperature conditions. These task demand improvements in the measurement system, which are proposed in the present work. Improvements are sought to achieve high-temperature measurements in metallic materials and conductive solids, and this system may also cover not only metallic materials. Simulations were performed to compare the distribution of temperatures developed in the measurement system as well as the radial heat leaks, which affect the measurement parameters for an aluminium bar, and uses copper bars as reference material. The simulations were made for measurements of an aluminium bar at a temperature of 150 ° C, in the plane and 3D, another at 175 ° C and one more known maximum temperature reached by a sample of the aluminium bar with a new heater acquired at 310 ° C.
Highlights
Thermal conductivity is a physical property of materials that measures heat conduction capacity.In other words, thermal conductivity is the ability of a substance to transfer the kinetic energy of its molecules to adjacent ones or to substances with which it is in contact
Thermal conductivity is an issue related to the second law of thermodynamics or the law of entropy, which governs most of the phenomena that occur in the universe, by which it is estimated that any process that involves work increases the entropy of the universe
The results for different temperatures of the aluminium sample selected in the experiment are described below, which were at 50 ◦ C and one at 175 ◦ C and the behaviour at an HST of 600 ◦ C
Summary
Thermal conductivity is a physical property of materials that measures heat conduction capacity.In other words, thermal conductivity is the ability of a substance to transfer the kinetic energy of its molecules to adjacent ones or to substances with which it is in contact. Thermal conductivity is a physical property of materials that measures heat conduction capacity. The determination of the thermophysical properties of materials is essential in all processes where energy exchanges occur, in particular, heat. Operation and maintenance of systems and equipment where the temperature is present, it is essential to know the value of these properties in particular of thermal conductivity. Thermal energy always flows spontaneously from highest to lowest concentration, or from hot to cold This implies that heat transfer by conduction occurs from one body to another at a lower temperature or between areas of the same material but with a different temperature. The potential energy is the result that the system of forces that affects a given body is conservative, the total work on a particle is zero
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