0101 Observation of vortex ring with swirl by using successive 3-D images

Kato, Yusuke; Naitoh, Takeshi; Okura, Nobuyuki

doi:10.1299/jsmefed.2009.5

Cited by 1 publication

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“…The previous studies (Kato et al, 2009;Naitoh et al, 2007) found the nature of vortex rings with swirl as follows. 1) The thickness of a vortex core with swirl becomes thin relative to that without swirl.…”

Section: Vortex Rings With Swirl ( = 02 Rad/s)mentioning

confidence: 96%

“…4 is wider than that without swirl in 2, because the decrease of the propagation velocity is small. The direction of the second vortex ring and the following are slightly deflected by the disturbance which is due to the vorticity left behind the preceding vortex ring caused by the "peeling" (Kato, 2009). The space between vortex rings with swirl (t = 50 s) increases because of the deflection, and the mutual interactions of rings are reduced.…”

Section: Vortex Rings With Swirl ( = 02 Rad/s)mentioning

confidence: 99%

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Mass transport using the series of vortex rings with swirl

Naitoh

Okura

Sumitomo

2014

JFST

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Behavior of the series of laminar vortex rings with circumferential flow, so-called swirl, were investigated using flow visualization, to evaluate the transport efficiency of the ejected fluid as vortex rings. In this study, the interval time of the vortex ring ejection, the formation number of vortex ring L O /D O (the normalized length of the ejected slug of fluid), and the angular velocity of the ejected fluid  are changed, while the mean ejection velocity is fixed. When vortex rings were generated at a short time interval, independent of L O /D O and , they were broken, and most of the fluid included in them was diffused near the orifice. When the vortex rings with little mutual interference were generated at an appropriate interval time, the breakdown of vortex ring structure is suppressed with moderate swirling flow. In those cases, each vortex ring moves separately for a long distance and the distribution area becomes wider as L O /D O increases.

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Section: Vortex Rings With Swirl ( = 02 Rad/s)mentioning

confidence: 96%

Section: Vortex Rings With Swirl ( = 02 Rad/s)mentioning

confidence: 99%