thermal conductivity monitoring Articles
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A Model Study of the Influence of Stress on the Thermal Conductivity of Dry Sand
An equivalent resistor model was investigated to determine its suitability for describing the thermal conductivity of dry granular soils. The suitability of the model for incorporating the influence of stress on thermal conductivity was also examined. The parameters necessary to specify the model were determined experimentally by fitting the model to measured values of thermal conductivity from ...
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Calibration of Thermal Conductivity Sensors for Measuring Soil Suction
The accuracy of suction measurements using thermal conductivity sensors is dependent upon their calibration. Therefore, a calibration study was undertaken by using a modified, commercially available, pressure plate extractor. The experimental setup along with the calibration procedure are described. Typical calibration results are presented. In general, results showed reasonable agreement between ...
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Numerical Modeling of a Thermal Conductivity Matric Suction Sensor
Thermal conductivity matric suction sensors appear to be a promising device for the measurement of suction in soil. The technique indirectly measures matric suction by measuring the thermal conductivity of a ceramic block. This paper uses both a spherical and a cylindrical porous medium to simulate the heat flow in a thermal conductivity matric suction sensor. It is found that, although the ...
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New in situ Catalyst Characterization System Delivers Novel Test Capabilities for Heterogeneous Catalysts
Micromeritics Instrument Corp., a global leader in material characterization technology, has launched the new in situ Catalyst Characterization System (ICCS) to deliver novel test capabilities for the reliable and industrially representative investigation of catalyst behavior. The new system is the product of the combined expertise of Micromeritics and PID Eng & Tech, a company recently ...
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The Thermal Probe—Measurement of the Thermal Conductivity and Drying Rate of Soil in the Field
The thermal probe is a metal rod with an internal heating element and temperature sensor. In the field it is pushed into a predrilled hole in otherwise undisturbed soil, and the thermal properties of the soil are estimated from the temperatures recorded at intervals after a constant power is supplied to the heating element. The following are discussed in this paper: the theory behind the methods ...
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Ensuring a vacuum jacket is working properly
The technique of using a vacuum guard or barrier to thermally insulate a cryogenic or refrigerant tank is straightforward: remove the air from around an object and eliminate conductive heat transfer. However, in practice, the method is only effective if the less than 1/1000th of the air remains in the space! In other words, if the pressure is only slightly above 1 Torr, the insulating value of ...
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Measurement of In Situ Density of Sand in a Chamber by Using a Thermal Conductivity Penetrometer
Reliable in situ testing during soil exploration is of great help to geotechnical engineers in design considerations. This paper describes the theory and the laboratory test results for determination of the density of a sand with a quasi-static penetrometer by measuring its thermal conductivity. Effects of disturbance caused by the penetrometer have been studied. It is shown that it is possible ...
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Piezoresistive Pressure Sensors and the HPM-760S
Piezoresistive Pressure Sensors - Direct Vacuum Gauges In the vacuum world, gauges can be characterized as being either “Direct” or “Indirect”. Direct gauges are so-called because they directly measure the force imparted on some surface. And since P = F /A (pressure equals force per unit area), the gauge is directly measuring the pressure. Some examples of direct ...
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Analysis on influential factors of loose coal thermal conductivity test accuracy
According to the status that the improved measurement system of loose coal thermal conductivity had more device error sources, which were not conducive to ensured test accuracy, the influence of system hardware error, coal sample self–oxidation exothermic, data processing error and other factors on test accuracy of the thermal conductivity were comprehensively analysed, and then corresponding ...
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Sustainability and Hydrogen: Gas Analysers for Green Energy Solutions
Introduction to Green Energy Solutions In our current global landscape, where the urgency for sustainable energy is more pronounced than ever, hydrogen is emerging as a key player in the arena of green energy solutions. This article sets out to explore the critical role of hydrogen in fostering sustainable energy systems. It also highlights the indispensable role of gas analysers in ensuring the ...
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