Mixed convection flow investigation in a rectangular horizontal tube stenosis via liquid crystal thermography and planar PIV

Stamatopoulos, C; Mathioulakis, DS; Katsamouris, A

dc.contributor.author	Stamatopoulos, C	en
dc.contributor.author	Mathioulakis, DS	en
dc.contributor.author	Katsamouris, A	en
dc.date.accessioned	2014-03-01T01:36:18Z
dc.date.available	2014-03-01T01:36:18Z
dc.date.issued	2011	en
dc.identifier.issn	0894-1777	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21281
dc.subject	Mixed convection	en
dc.subject	Tube-stenosis	en
dc.subject	Secondary flow	en
dc.subject	Liquid crystals	en
dc.subject	Intracoronary thermography	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Physics, Fluids & Plasmas	en
dc.subject.other	HEAT-TRANSFER	en
dc.subject.other	VORTEX FLOW	en
dc.subject.other	ENTRANCE REGION	en
dc.subject.other	SECONDARY FLOW	en
dc.subject.other	TOP PLATE	en
dc.subject.other	CHANNEL	en
dc.subject.other	INSTABILITY	en
dc.subject.other	DUCT	en
dc.subject.other	AIR	en
dc.subject.other	STABILIZATION	en
dc.title	Mixed convection flow investigation in a rectangular horizontal tube stenosis via liquid crystal thermography and planar PIV	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.expthermflusci.2010.10.008	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.expthermflusci.2010.10.008	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	The temperature and velocity field in a horizontal convergent-divergent rectangular channel heated from below is studied experimentally for a Reynolds range 8-120. Grashof numbers from 0.44 x 10(5) to 2.56 x 10(5) and Richardson numbers from 3 to 4000, using water as working fluid. The duct aspect ratio (width/height) varies from 1 at its inlet to 2.28 at the stenosis neck, and both the upper and bottom walls are tilted with an angle of +/- 15.7 degrees with respect to the horizontal. The temperature of the bottom wall is kept constant above that of the issuing fluid. The temperature field is recorded by liquid crystals in the vertical mid plane whereas the velocity field is measured in this plane as well as in four cross sections of the divergent passage by planar Ply, revealing the characteristics of the secondary velocity field. For all the examined cases the flow in the convergent passage is free of thermal plumes, and the thermal boundary layer is thin. In contrast, the divergent passage is characterized by a thermal plume which is shifted upstream with increasing Gr or reducing Re. Both transversal and longitudinal rolls emerge in this diffuser the strength of which depend on Re and Cr influencing the streamwise distribution of Nusselt which for low Re presents a minimum. (C) 2010 Elsevier Inc. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE INC	en
heal.journalName	EXPERIMENTAL THERMAL AND FLUID SCIENCE	en
dc.identifier.doi	10.1016/j.expthermflusci.2010.10.008	en
dc.identifier.isi	ISI:000286708800012	en
dc.identifier.volume	35	en
dc.identifier.issue	2	en
dc.identifier.spage	375	en
dc.identifier.epage	386	en