DC Field | Value | Language |
---|---|---|
dc.contributor.author | Syed, Anwar ul Hasson | ko |
dc.contributor.author | Sung, Hyung Jin | ko |
dc.date.accessioned | 2009-11-30T02:40:15Z | - |
dc.date.available | 2009-11-30T02:40:15Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 2009-04 | - |
dc.identifier.citation | FLOW TURBULENCE AND COMBUSTION, v.82, pp.391 - 406 | - |
dc.identifier.issn | 1386-6184 | - |
dc.identifier.uri | http://hdl.handle.net/10203/13649 | - |
dc.description.abstract | The effects of exit-wedge angle on evolution, formation, pinch-off, propagation and diffusive mass entrainment of vortex rings in air were studied using digital particle image velocimetry. Vortex rings were generated by passing a solenoid-valve-controlled air jet through a cylindrical nozzle. Experiments were performed over a wide range of exit-wedge angles (10A degrees a parts per thousand currency signaEuro parts per thousand alpha a parts per thousand currency sign 90A degrees) of the cylindrical nozzle, initial Reynolds numbers (450 a parts per thousand currency sign Re a parts per thousand currency sign 4,580) and length-to-diameter ratios (0.9 a parts per thousand currency sign L/D a parts per thousand currency sign 11) of the air jet. For sharp edges (alpha a parts per thousand currency sign 10A degrees), a secondary ring may emerge at high Reynolds numbers, which tended to distort the vortex ring if ingested into it. For blunt edges (alpha a parts per thousand yen 45A degrees), by contrast, stable vortex rings were produced. The formation phase of a vortex ring was found to be closely related to its evolution pattern. An exit-wedge angle of 45A degrees was found to be optimal for rapid pinch-off and faster propagation and better stability of a vortex ring. Diffusive mass entrainment was found to be between 35% and 40% in the early stages of a vortex ring propagation and it gradually increased throughout the course of vortex ring propagation. Entrainment fraction was found to be sensitive to the L/D ratio of the initial jet and decreases when the L/D ratio is increased. | - |
dc.language | English | - |
dc.language.iso | en_US | en |
dc.publisher | SPRINGER | - |
dc.subject | UNIVERSAL TIME-SCALE | - |
dc.subject | PISTON VORTEX | - |
dc.subject | CIRCULATION | - |
dc.subject | STABILITY | - |
dc.subject | VELOCITY | - |
dc.title | Effect of an Exit-Wedge Angle on Pinch-off and Mass Entrainment of Vortex Rings in Air | - |
dc.type | Article | - |
dc.identifier.wosid | 000264519900006 | - |
dc.identifier.scopusid | 2-s2.0-63049112035 | - |
dc.type.rims | ART | - |
dc.citation.volume | 82 | - |
dc.citation.beginningpage | 391 | - |
dc.citation.endingpage | 406 | - |
dc.citation.publicationname | FLOW TURBULENCE AND COMBUSTION | - |
dc.identifier.doi | 10.1007/s10494-008-9184-9 | - |
dc.embargo.liftdate | 9999-12-31 | - |
dc.embargo.terms | 9999-12-31 | - |
dc.contributor.localauthor | Sung, Hyung Jin | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | Vortex ring | - |
dc.subject.keywordAuthor | Evolution | - |
dc.subject.keywordAuthor | Pinch-off | - |
dc.subject.keywordAuthor | Mass entrainment | - |
dc.subject.keywordPlus | UNIVERSAL TIME-SCALE | - |
dc.subject.keywordPlus | PISTON VORTEX | - |
dc.subject.keywordPlus | CIRCULATION | - |
dc.subject.keywordPlus | STABILITY | - |
dc.subject.keywordPlus | VELOCITY | - |
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