Publication Type Journal Article
Title New portable instrument for the measurement of thermal conductivity in gas process conditions
Authors C.S.G.P. Queiros M J V Lourenco S I Vieira Joao Serra CA Nieto de Castro
Groups MTFT
Journal REVIEW OF SCIENTIFIC INSTRUMENTS
Year 2016
Month June
Volume 87
Number 6
Pages
Abstract The development of high temperature gas sensors for the monitoring and determination of thermo-physical properties of complex process mixtures at high temperatures faces several problems, related with the materials compatibility, active sensing parts sensitivity, and lifetime. Ceramic/thin metal films based sensors, previously developed for the determination of thermal conductivity of molten materials up to 1200 degrees C, were redesigned, constructed, and applied for thermal conductivity measuring sensors. Platinum resistance thermometers were also developed using the same technology, to be used in the temperature measurement, which were also constructed and tested. A new data acquisition system for the thermal conductivity sensors, based on a linearization of the transient hot-strip model, including a portable electronic bridge for the measurement of the thermal conductivity in gas process conditions was also developed. The equipment is capable of measuring the thermal conductivity of gaseous phases with an accuracy of 2\%-5\% up to 840 degrees C (95\% confidence level). The development of sensors up to 1200 degrees C, present at the core of the combustion chambers, will be done in a near future. Published by AIP Publishing.
DOI http://dx.doi.org/10.1063/1.4952745
ISBN
Publisher AMER INST PHYSICS
Book Title
ISSN 0034-6748
EISSN 1089-7623
Conference Name
Bibtex ID ISI:000379177000079
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