NDLI: The Effects of Thermocouple Materials and Insulating Mica in an Erodable Surface Thermocouple

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Grech, Alan Sant, Tonio Farrugia, Mario
Copyright Year	2008
Abstract	A finite-difference model of a surface thermocouple (erodable-ribbon type) of a heat flux sensor was built to analyze the transient response of the thermal junction and the two-dimensional effects created by the insulation between the thermocouple materials and the body material of the sensor. Such transient heat flux sensors have previously been used for measurements in internal combustion engines. It is commonly assumed that the heat transfer within these devices is one-dimensional even though the sensors are constructed from at least two different materials. It is common practice to calculate the transient heat flux using properties of body material and this leads to a substantial error as demonstrated by the model. With these sensors, low thermal capacity thermocouple junctions are formed near the surface by abrasion and response times as low as 30μs have been reported. Experiments were performed on an E type surface thermocouple heated at 11W by means of a copper vapor laser pulsating at 10kHz. Measurement of surface thermocouple temperature was performed at a 100kHz sampling rate. A finite-difference model was used to analyze the response of these sensors to the pulsed laser heating operating at 10 kHz. The insulation between the thermocouples and the body material was mica and the body material was AISI 316 stainless steel. The experimental measurements and simulation results are reported in this work. The analysis and comparison of experimental and simulation results showed that for such thermocouples two-dimensional effects exist due to the presence of mica sheets. The temperature decay between pulses was better matched using thermal properties of mica sheets rather than the thermal properties of the body material. However the body material still dominates the temperature swing of the thermocouple junction.
Sponsorship	Heat Transfer Division
Starting Page	685
Ending Page	697
Page Count	13
File Format	PDF
ISBN	9780791848494
DOI	10.1115/HT2008-56090
e-ISBN	0791838323
Volume Number	Heat Transfer: Volume 3
Conference Proceedings	ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences
Language	English
Publisher Date	2008-08-10
Publisher Place	Jacksonville, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Surface thermocouple Transient response Eroding-type thermocouple Finite-difference equations Heat flux Thermocouples Transients (dynamics)
Content Type	Text
Resource Type	Article

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