Experimental flow study within a self oscillating collapsible tube

Kounanis, K; Mathioulakis, DS

dc.contributor.author	Kounanis, K	en
dc.contributor.author	Mathioulakis, DS	en
dc.date.accessioned	2014-03-01T01:14:37Z
dc.date.available	2014-03-01T01:14:37Z
dc.date.issued	1999	en
dc.identifier.issn	0889-9746	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13168
dc.subject	Flow Field	en
dc.subject	Flow Visualization	en
dc.subject	Oscillations	en
dc.subject	Phase Difference	en
dc.subject	Pressure Measurement	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.subject.other	STEADY FLOW	en
dc.subject.other	MODEL	en
dc.subject.other	PRESSURE	en
dc.subject.other	AREA	en
dc.title	Experimental flow study within a self oscillating collapsible tube	en
heal.type	journalArticle	en
heal.identifier.primary	10.1006/jfls.1998.0191	en
heal.identifier.secondary	http://dx.doi.org/10.1006/jfls.1998.0191	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	The flow field within a self-excited flexible tube was studied by employing flow visualization, velocity and pressure measurements. Under low positive tansmural pressures at the tube inlet (of the order of 50 mm H2O) the tube was set to an oscillatory motion, the initiation of which was due to a flow asymmetry. Namely, although initially the flow was separated from both sides of the formed divergent nozzle close to the tube outlet, at an arbitrary instant this became attached to one side, but stayed separated in the remaining part of the nozzle. When this flow asymmetry occurred, the walls approached each other and the tube neck formed there by started oscillating streamwise, setting the tube to an oscillatory motion. During the downstream motion of the tube neck, it was shrunk, causing a twofold increase of the local velocities compared to the inlet ones, which remained almost constant. On the contrary, when moving upstream, the tube neck expanded, causing a flow reversal in this area and a flow deceleration in the remaining part of the tube. The pressure signals upstream and downstream of the tube exhibited a phase difference, the latter leading, taking an order of magnitude higher values than the first one. © 1999 Academic Press.	en
heal.publisher	ACADEMIC PRESS LTD	en
heal.journalName	Journal of Fluids and Structures	en
dc.identifier.doi	10.1006/jfls.1998.0191	en
dc.identifier.isi	ISI:000079016900003	en
dc.identifier.volume	13	en
dc.identifier.issue	1	en
dc.identifier.spage	61	en
dc.identifier.epage	73	en