Author:
Seibold Florian,Schwab Andreas,Dubois Victor,Poser Rico,Weigand Bernhard,von Wolfersdorf Jens
Abstract
Two-wire thermocouples are often used for temperature measurements. Under transient conditions, measurement errors can occur due to capacitive inertia and heat conduction along the stem of the thermocouples. The present study presents a correction of these thermocouple measurement errors caused by transient inertia and conductive effects using a simplified analytical approach and its numerical solution. Based on an energy balance the mathematical modelling is derived and analytically solved for specific boundary conditions. Further, numerical solutions have been implemented with different model complexities. Thereby the models show the significance of the necessary correction as well as the good agreement with theoretical considerations. A corresponding experimental validation is given in Part II.
Reference26 articles.
1. Naik S., Retzko S., Gritsch M., and Sedlov A., “Impact of Turbulator Design on the Heat Transfer in a High Aspect Ratio Passage of a Turbine Blade,” in ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, Düsseldorf, Germany, Jun. 2014.
2. Accurate measurement of unsteady state fluid temperature
3. Konopka K., “Thermocouple Dynamic Errors Correction for Instantaneous Temperature Measurements in Induction Heating,” in 19th IMEKO TC 4 Symposium and 17th IWADC Workshop.
4. Terzis A., von Wolfersdorf J., Weigand B., and Ott P., “Thermocouple Thermal Inertia Effects on Impingement Heat Transfer Experiments using the Transient Liquid Crystal Technique,” Measurement Science and Technology, vol. 23, no. 11, 2012.
5. Response compensation of fine-wire thermocouples and its application to multidimensional measurement of a fluctuating temperature field