Eroding ribbon thermocouples: impulse response and transient heat flux analysis

Buttsworth, David R. and Stevens, Robert and Stone, C. Richard (2005) Eroding ribbon thermocouples: impulse response and transient heat flux analysis. Measurement Science and Technology, 16 (7). pp. 1487-1494. ISSN 0957-0233

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Abstract

We have investigated a particular type of fast-response surface thermocouple to determine if it is appropriate to use a one dimensional transient heat conduction model to derive the transient surface heat flux from the measurements of surface temperature. With these sensors, low thermal inertia thermocouple junctions are formed near the surface by abrasive wear. Using laser excitation, we obtained the impulse response of these commercially available devices. The response of particular sensors can vary if new junctions are created by abrasive wear. Furthermore, the response of these sensors was found to deviate substantially from the one dimensional model and varied from sensor to sensor. The impulse response was simulated with greater fidelity using a two dimensional finite element model, but three dimensional effects also appear to be significant. The impact of these variations on the derived heat flux is assessed for the case of measurements in an internal combustion engine. When the measured impulse response is used to derive the surface heat flux, the apparent reversal of heat flux during the expansion stroke does not occur.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Deposited in accordance with the copyright policy of the publisher. Measurement Science and Technology Copyright 2005 IOP Publishing Ltd.
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 11 Oct 2007 00:19
Last Modified: 02 Jul 2013 22:31
Uncontrolled Keywords: transient heat flux; surface temperature measurement; fast response; eroding; surface junction thermocouples; internal combustion engine heat flux; aerothermodynamic measurements; internal ballistics research
Fields of Research (FOR2008): 02 Physical Sciences > 0203 Classical Physics > 020304 Thermodynamics and Statistical Physics
02 Physical Sciences > 0299 Other Physical Sciences > 029904 Synchrotrons; Accelerators; Instruments and Techniques
09 Engineering > 0915 Interdisciplinary Engineering > 091502 Computational Heat Transfer
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: doi: 10.1088/0957-0233/16/7/011
URI: http://eprints.usq.edu.au/id/eprint/352

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