Experimental study and simulation model for determining the response time of thermocouples with different insulation thicknesses
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Universidade Federal de Minas Gerais
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The aim of this paper is to determine the temporal response of T-type and K-type thermocouples with different
coating thicknesses. In applications with high thermal gradients, the thermocouple can experience thermal fatigue
caused by its exposure to high temperature levels and severe thermal cycling involving heating and cooling of the sensor.
Repeated expansions and contractions can lead to the appearance of micro-cracks, affecting the accuracy of temperature
measurements and eventually causing sensor failure. In these circumstances, thermocouples with greater sheath
thicknesses are more suitable. However, thicker thermocouples have a high response time, so that, in processes under
transient conditions, the delay will generate a temperature error at every instant of time. The present study focuses on
how different coating thicknesses affect the thermocouple's ability to accurately measure temperature changes over time,
especially in transient conditions. Experimental tests were carried out with a T-type thermocouple, with a 0.5 and 1.5
mm sheath, and K-type thermocouples of thickness 6mm and 8mm sheath. An equation for prediction of delay time of
thermocouples is presented and validated experimentally with mean error of 3.57%.
Abstract
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Engenharia mecânica, Modelagem matemática
Palavras-chave
Thermocouple, Temporal response, Mathematical modeling, Time constant.
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https://eventos.abcm.org.br/cobem2023/