A Note on Vortex Breakdown in a Cylindrical Tube

Bellamy-Knights, P. G.

doi:10.1115/1.3448299

Cited by 12 publications

(4 citation statements)

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“…Visual evidence of the inner cell may also be found in Figure 6 or Sarpkaya (l971a), and in a short note by Bellamy-Knights (1976). Bellamy-Knights concludes that flow on the axis of inner structure is not reversed, in agreement with Faler & Leibovich (l977b), but does not observe a stagnation point terminating the inner cell.…”

Section: Time Averaged Streamlinesmentioning

confidence: 60%

The Structure of Vortex Breakdown

Leibovich¹

1978

Annu. Rev. Fluid Mech.

608

266

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Section: Time Averaged Streamlinesmentioning

confidence: 60%

The Structure of Vortex Breakdown

Leibovich¹

1978

Annu. Rev. Fluid Mech.

608

266

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“…The two predominant forms of vortex breakdown, the (axisymmetric) bubble and (non-axisynimetric) spiral, were first identified in the leading-edge vortices generated by flow over delta wings a t incidence and their qualitative features clearly described by Lambourne & Bryer (1961). Subsequent experiments on vortex breakdown, performed for the more controlled situation of flow in cylindrical or flared tubes with swirl introduced by upstream guide vanes, have been reported by Harvey (1962), Kirkpatrick (1964), Lambourne (1965), Cassidy & Falvey (1970), Sarpkaya (1971Sarpkaya ( a , b, 1974, Ikeda, Sakata & Kikuchi (1974), Bellamy-Knights (1976), Leibovich (1977, 19781, andGarg &Leibovich (1979). Sarpkaya ( 1 9 7 1~) identified a third form of breakdown, the double helix, and Faler & Leibovich (1 977) describe a total of six distinct modes of disruption of a vortex core (including vortex breakdown) as the Reynolds number a,nd circulation number are varied.…”

Section: Introductionmentioning

confidence: 94%

Vortex-flow regimes

1982

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Analysis of a considerable body of new data, based upon flow-visualization experiments, reveals a simple criterion for the occurrence of vortex breakdown at a fixed location in a tube: ReB ∼ Ω-3 R−1, where Ω is the circulation number, R the ratio of the radial to tangential velocities in the inflow region, and ReB the pipe Reynolds number at which vortex breakdown occurs. The constant of proportionality is found to be practically independent both of the pipe flare angle α and the type of breakdown observed (bubble, spiral, etc.) although the latter is shown to depend on ReB. Theoretical support for the experimental results is derived from the analysis of Benjamin (1962) combined with similarity arguments.

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“…This occurred randomly in time. This type of bubble was observed by Bellamy Knights [20] and also noticed by Faler and Leibovich [5] and Bayomi [22] . Bellamy Knights reported that worm is extended until the lower of bubble while Faler and Leibovich showed that the worm only extended to two thirds of the bubble length.…”

Section: Bubble Modementioning

confidence: 62%

“…Under controlled phenomenon circumstances, experiments on vortices confined in tubes were devised by Harvey [18][19] , Sarpkaya [3] , Bellamy Knights [20] , Faler and Leibovich [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] , Bayomi [22] and Heikal et al [23] , Althaus et al [24] , Hourigan et al [25] , Bhattachavyya & Pal [26] , Hussain et al [27] and Said [28] , and so many others. Most investigators used a horizontal divergent tube as a test section to study the different modes of vortex breakdown phenomena but Harvey [19] and Bayomi [22] used constant diameter vertical cylindrical tube.…”

Section: Introductionmentioning

confidence: 99%

An Investigation on Vortex Breakdown Phenomena in a Vertical Cylindrical Tube

Bayomi¹,

Said²,

Sedrak³

et al. 2011

eng

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Abstract. Vortex flows are subject to a number of major structural changes involving very large disturbances when a characteristic ratio of azimuthal to axial velocity components is varied. Vortex breakdowns are among the structural forms that may occur. This phenomenon is one of the hydrodynamic instability problems and it is encountered in many practical application, such as, aerodynamics (in aeronautics), combustion chamber, diffusers and nozzle.The objectives of the present research are to investigate the effect of Reynolds number (Re) and circulation number (Ω) on the observed modes of the vortex breakdown. The position of the vortex breakdown with two vertical cylinder tube length as well as for clockwise and anti-clockwise flow direction is also investigated.The results revealed that there are a total of six distinct modes of the disruption of the vortex core as Re and Ω of the flow were varied. The breakdown position was found to be dependent on both Re and Ω of the flow. Whereas, for all Re values an increase in Ω always results in moving the breakdown position upstream for all Re values. The breakdown position is smaller for anti-clockwise flow direction than that, when vanes were set at clockwise flow direction for long and short tube.

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A Note on Vortex Breakdown in a Cylindrical Tube

Cited by 12 publications

References 0 publications

The Structure of Vortex Breakdown

The Structure of Vortex Breakdown

Vortex-flow regimes

An Investigation on Vortex Breakdown Phenomena in a Vertical Cylindrical Tube

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