An experimental and numerical study of a 90 degrees bifurcation

Mathioulakis, DS; Pappou, T; Tsangaris, S

dc.contributor.author	Mathioulakis, DS	en
dc.contributor.author	Pappou, T	en
dc.contributor.author	Tsangaris, S	en
dc.date.accessioned	2014-03-01T01:46:22Z
dc.date.available	2014-03-01T01:46:22Z
dc.date.issued	1997	en
dc.identifier.issn	0169-5983	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24891
dc.subject.classification	Mechanics	en
dc.subject.classification	Physics, Fluids & Plasmas	en
dc.subject.other	FLOW	en
dc.subject.other	JUNCTIONS	en
dc.title	An experimental and numerical study of a 90 degrees bifurcation	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	The how held of a 90 degrees square duct bifurcation was examined both experimentally and numerically for a Reynolds number of 1200 and equal branch flow rates. Velocity measurements were carried out with a one-component LDV, recording, besides the time mean streamwise velocity component, its time variation due to vortex shedding which took place in the extension of the main duct, as well as secondary flow velocities in the 90 degrees branch. Flow visualization provided additional information about the three-dimensional character of the how field by recording the paths of neutrally buoyant solid particles. The experimental data were compared with the results of a numerical method, constituting an extension of the well-known SOLA method to a 3-D generalized coordinate system, presented here for the first time. These comparisons were very successful in the vertical branch but less satisfactory in the horizontal branch where unsteadiness was very strong. The characteristic frequency of the velocity fluctuations in the detached shear layer of the horizontal branch was very well predicted but the velocity amplitudes were underestimated. The predicted secondary flow in the vertical branch was compared well with the experimental data presenting maximum values close to the inlet mean velocity.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	FLUID DYNAMICS RESEARCH	en
dc.identifier.isi	ISI:A1997VW08900001	en
dc.identifier.volume	19	en
dc.identifier.issue	1	en
dc.identifier.spage	1	en
dc.identifier.epage	26	en