Study of an integrated thermal sensor in different operational modes, under laminar, transitional and turbulent flow regimes

dc.contributor.author	Σταματόπουλος, Χρήστος Η.	el
dc.contributor.author	Πετρόπουλος, Αναστάσιος	el
dc.contributor.author	Μαθιουλάκης, Δημήτριος Σ.	el
dc.contributor.author	Καλτσάς, Γρηγόριος	el
dc.date.accessioned	2015-05-27T18:25:53Z
dc.date.available	2015-05-27T18:25:53Z
dc.date.issued	2015-05-27
dc.identifier.uri	http://hdl.handle.net/11400/11271
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/us/	*
dc.source	http://www.elsevier.com/	en
dc.subject	Aerodynamics
dc.subject	Flow sensors
dc.subject	Reynolds number
dc.subject	Αεροδυναμική
dc.subject	Αισθητήρες ροής
dc.subject	αριθμός Reynolds
dc.title	Study of an integrated thermal sensor in different operational modes, under laminar, transitional and turbulent flow regimes	en
heal.type	journalArticle
heal.classification	Technology
heal.classification	Electrical engineering
heal.classification	Τεχνολογία
heal.classification	Ηλεκτρολογία Μηχανολογία
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh85133147
heal.classificationURI	http://zbw.eu/stw/descriptor/18426-4
heal.classificationURI	N/A-Τεχνολογία
heal.classificationURI	N/A-Ηλεκτρολογία Μηχανολογία
heal.identifier.secondary	DOI: 10.1016/j.expthermflusci.2008.06.003
heal.language	en
heal.access	campus
heal.publicationDate	2008-09
heal.bibliographicCitation	STAMATOPOULOS, C.H., PETROPOULOS, A., MATHIOULAKIS, D.S. & KALTSAS, G. (2008). Study of an integrated thermal sensor in different operational modes, under laminar, transitional and turbulent flow regimes. Experimental Thermal and Fluid Science. [online] 32 (8). p. 1687-1693. Available from: http://www.elsevier.com/[Accessed 20/06/2008]	en
heal.abstract	The behaviour of a thermal flow sensor attached to the wall of a square tube is examined, exposed to gas flow for Reynolds numbers in the range 0-4.1 × 10 4. Consisting of a polysilicon heater and a pair of thermopiles, the sensor's three output signals (heater power, its electric resistance and the thermopile signal) are analyzed as a function of Re. Employing three different modes of operation (constant power (CP), constant voltage (CV) and constant temperature (CT)), it was found that the sensor sensitivity maximizes in CT mode. Heater power and its resistance vary with Re a where a changes significantly for Re > 2000. The thermopile signal, which corresponds to the streamwise temperature gradient across the heater, in contrast to the other two signals, is more sensitive in detecting flow disturbances. Its fluctuations increase with a high rate close to Re = 1800, a value which is smaller than the corresponding increase of the other two signals. The probability density function (pdf) of its fluctuations is negatively skewed consistently for the range 1500 < Re < 11,000 while for Re > 11,000 it turns to a symmetric one. The pdf of the other two signals do not show any systematic trends with Re. The most striking difference of the thermopile signal behaviour compared to the other two is its multivalued relationship with Re in the range 2000 < Re < 11,000.	en
heal.publisher	Elsevier	en
heal.journalName	Experimental Thermal and Fluid Science	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true