Wo in einem Thermoelement herrscht die gemessene Temperatur? Analyse mittels FE-Simulation

Javurek, Mirko; Mittermair, Andreas

doi:10.1515/teme-2016-0028

Cited by 5 publications

(2 citation statements)

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“…Temperature gradients along the homogeneous conductors have no effect on the measured thermoelectric emf since the resulting differential partial voltages along the two conductors cancel each other. [6,7]. On the other hand, however, an additional thermoelectric voltage occurs when the Seebeck coefficient changes, e.g.…”

Section: Fundamentals Of Temperature Measurement With Thermocouplesmentioning

confidence: 99%

“…The temperature curves of the thermocouples (TE1 -TE4) also shown in Figure 7, which should be used to validate the results of the direct thermoelectric voltage measurement (referred to as Tweld_ThermV in the diagram), always indicate a maximum below the temperature curves. This can be attributed both to a positioning slightly below the surface [7] and to the delay periods of the thermocouples. It was determined after the measurement that thermocouple 3 was not positioned exactly, which can be used to justify the deviating temperature curve.…”

Section: Measurements At the Robotized Fsw Welding Unitmentioning

confidence: 99%

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Challenges of Temperature Measurement During the Friction Stir Welding Process

Augustin¹,

Fröhlich²,

Krapf³

et al. 2020

MEM

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The exact determination of the process zone temperature can be considered as an increasingly important role in the control and monitoring of the friction stir welding process (FSW). At present, temperature measurement is carried out with the aid of a temperature sensor integrated into the tool (usually thermocouples). Since these cannot be attached directly to the joining area, heat dissipation within the tool and to the environment cause measurement deviations as well as a time delay in the temperature measurement. The article describes a process and the challenges that arise in this process, how a direct temperature measurement during the process can be achieved by exploiting the thermoelectric effect between tool and workpiece, without changing the tool by introducing additional temperature sensors.

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Section: Fundamentals Of Temperature Measurement With Thermocouplesmentioning

confidence: 99%

Section: Measurements At the Robotized Fsw Welding Unitmentioning

confidence: 99%

Challenges of Temperature Measurement During the Friction Stir Welding Process

Augustin¹,

Fröhlich²,

Krapf³

et al. 2020

MEM

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Continuous Casting Secondary Cooling: Laboratory Heat Transfer Measurements and Accuracy Considerations by Comparison with the Real Situation

Javurek

Mittermair

2020

steel research int.

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In secondary cooling of continuous casting, it is very important to know the cooling heat flux for the actual spray cooling situation with respect to various parameters like the local position, the nozzle types, distances, and the water and air flow rates, to be able to control the cooling conditions precisely. As heat flux measurements on a casting machine are too challenging, experimental laboratory test rigs are designed and used for measurements by different research groups. Therefore, metal probes of different dimensions and materials are heated up to the desired temperature and then exposed to spray nozzles. The heat flux is usually measured by temperature sensors immersed in the probe body, and then determined from the measured temperature using inverse modelling methods. Herein, the differences between the real and laboratory conditions are focused on using a mathematical heat transfer simulation model. The influence of strand surface temperature, nozzle spray water flow conditions, and Leidenfrost effect are pointed out. A procedure to use heatflux data measured on a test rig for cooling control on a real caster despite the different conditions is proposed.

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C-type two-thermocouple sensor design between 1000 and 1700 °C

Guo,

Zhang,

et al. 2024

Review of Scientific Instruments

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At the present stage of transient ultra-high-temperature energy release of boron-containing warm-pressure explosives, single thermocouples are often used for multi-point measurements in the process of their temperature field changes, and the results of their temperature field reconstruction are not satisfactory due to the limited consistency of the thermocouples. Aiming at the above-mentioned problems, a C-type two-thermocouple suitable for transient temperature measurement in high-temperature environments is designed; the system characterization of the two-thermocouple is carried out by using the blind system identification method of the inter-relationships; the identification process is evaluated by a new cost function; and the optimal solution on the new cost function is realized by using the gradient descent method. The temperature reconstruction of the two-thermocouple output excited by the simulated heat source is carried out by using the auto-regressive with extra inputs model, and the feasibility of the reconstruction results is verified. In the experimental part, a thermocouple dynamic characteristic calibration system based on a high-temperature furnace is constructed and experimental validation is carried out in the high-temperature furnace to compare the effects of different exposure lengths and different wire diameters on the output of the two-thermocouple, and as a result, the outputs are corrected and analyzed. The results show that two-thermocouple methods with different combinations of wire diameters are better for temperature measurement, with a reconstructed root mean squared error of 0.0162 and a goodness of fit of 89.13%.

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Wo in einem Thermoelement herrscht die gemessene Temperatur? Analyse mittels FE-Simulation

Cited by 5 publications

References 0 publications

Challenges of Temperature Measurement During the Friction Stir Welding Process

Challenges of Temperature Measurement During the Friction Stir Welding Process

Continuous Casting Secondary Cooling: Laboratory Heat Transfer Measurements and Accuracy Considerations by Comparison with the Real Situation

C-type two-thermocouple sensor design between 1000 and 1700 °C

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