Experimental Study on Structure of Gas Flow in Tube Banks with Tube Axes Normal to Flow : Part 1, Karman Vortex Flow from Two Tubes at Various Spacings

Ishigai, Seikan; Nishikawa, Eiichi; Nishimura, K.; Cho, Katsuzo

doi:10.1299/jsme1958.15.949

Cited by 167 publications

(112 citation statements)

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“…On the other hand, the gap flow deflection is bi-stable in the two side-by-side cylinder arrangement (T/dϷ1.2-2.2), and spontaneously changes over in a random manner from one side to another. 4,5 Time scale for the change-over is several orders of magnitude longer than that of vortex shedding and also several orders of magnitude longer than that for the instability of the separated shear flows. 7 The bi-stable gap flow is well known but the mechanism is not well understood.…”

Section: Discussionmentioning

confidence: 99%

“…[2][3][4][5][6][7][8][9] It is now well established that when the cylinder center-to-center spacing ratio T/d is less than 1.2, the two cylinders act like a single bluff body, forming a single Kármán vortex street. For T/dϷ1.2-2.2, the gap flow between the cylinders is deflected, thus generating one narrow and one wide wake.…”

Section: Introductionmentioning

confidence: 99%

“…Evidently, this flow is more representative of those behind a row of circular cylinders; many of its features are shared by the latter. [10][11][12] Kumada et al 13 measured the pressure distributions, velocity distributions and vortex shedding frequencies of a three side-by-side cylinder wake at the Reynolds number Reϭ(1.0-3.2)ϫ10 4 . Four typical flow regimes were identified.…”

Section: Introductionmentioning

confidence: 99%

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Effect of unequal cylinder spacing on vortex streets behind three side-by-side cylinders

Zhang

Zhou

2001

Physics of Fluids

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Strain-vorticity induced secondary motion in shallow flows Phys. Fluids 24, 023601 (2012) Developed quantum turbulence and its decay Phys. Fluids 24, 011301 (2012) A fully resolved numerical simulation of turbulent flow past one or several spherical particles Phys. Fluids 24, 013303 (2012) Decaying versus stationary turbulence in particle-laden isotropic turbulence: Turbulence modulation mechanism Phys. The turbulent near-wake of three side-by-side circular cylinders with equal or unequal spacing has been experimentally investigated using various techniques, including the hot wire, laser Doppler anemometer, and flow visualization. The work aims to understand the effect of unequal cylinder spacing on the vortex streets behind the three cylinders. When the cylinder center-to-center spacing is identical, i.e., T 1 /dϭT 2 /dϭ1.5, the flow is symmetric about the centerline, with one wide wake behind the central cylinder and one narrow wake on each side of the wide wake. The dominant frequency in the narrow wakes is about 5.4 times that in the wide wake. The observation is consistent with previous reports, thus lending credence to the present measurement. As T 2 /d is slightly increased to 1.6, a remarkable change occurs in the flow. A comparison is made between the cases of equally and unequally spaced cylinders in terms of the pressure around the cylinders, drag, lift, dominant frequencies, and vortex formation mechanisms. The flow topology ͑vortex patterns͒ and downstream evolution are also discussed in detail.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of unequal cylinder spacing on vortex streets behind three side-by-side cylinders

Zhang

Zhou

2001

Physics of Fluids

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“…Based on the interference drag (Biermann and Herrnstein 1933), photographic studies of the wake behind the cylinders (Landweber 1942;Ishigai et al 1972), vortex shedding frequency (Spivak 1946) N.…”

Section: Flow Regimesmentioning

confidence: 99%

Flow-Induced Vibration of Circular Cylindrical Structures

Chen

1985

151

203

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A major purpose of the Technical Information Center is to provide the broadest dissemination possible of information contained in DOE's Research and Development Reports to business, industry, the academic community, and federal, state and local governments.Although a small portion of this report is not reproducible, it is being made available to expedite the availability of information on the research discussed herein. ANL-85-51 ------------------------------ 11-6References--Sec. Current DOE funding for this work is from the Office of Reactor Systems, Development and Technology within the Office of Nuclear Energy.A significant amount of material presented in this report is taken from the results of various program activities sponsored by AEC, ERDA, and DOE at ANL.The author is indebted to those who supported the program at ANL throughout the years, in particular, Messrs. Nicholas Grossman and Chet Bigelow for their interest and recognition of this important and challenging subject.The author is grateful for the support received from his colleagues of the Vibration Analysis Section of the Components Technology Division of ANL, which provides the resources necessary to perform this work.The Section Manager, Dr. M. W. Wambsganss, with his unfaltering faith in me, gave me encouragement and confidence to complete this report.Grateful appreciation is expressed to Miss Joyce Stephens for her superb typing and word-processing and to Mrs. S. K. Zussman for her expert editing of the manuscript. 28 CREDITSThe author and Argonne National Laboratory gratefully acknowledge the courtesy of the organizations aLid individuals who granted permission to use illustrations and. other information in this report.The sources of this information are listed below. Figs. 6.3, 6.4 This report summarizes the flow-induced vibration of circular cylinders in quiescent fluid, axial flow, and crossf low, and applications of the analytical methods and experimental data in design evaluation of various system components consisting of circular cylinders.

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“…Ishigai et al (1972) observed that the downstream cylinder sits inside the vortex formation region of the upstream cylinder. The Kármán vortex shedding from the upstream cylinder is suppressed.…”

Section: Extended-body Regimementioning

confidence: 97%

Flow-induced vibrations of in-line cylinder arrangements at low Reynolds numbers

Étienne

Scolan

et al. 2016

Journal of Fluids and Structures

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Oviedo-Tolentino et al. ontétudié expérimentalement les oscillations de 10 cylindres placés les uns derrière les autres pour un facteur de masse amortissement de m * ζ = 0.13. Ils ont confirmé que le troisième cylindre, c'està dire celui placé derrière les deux premiers, peut subir des oscillations transverses plus importantes encore que celles subies par le deuxième cylindre. Ces grandes oscillations peuvent non seulement causer une fatigue excessive des matériaux maiségalement provoquer des collisions entre les cylindres. Ainsi, les WIV peuvent poser de sérieux problèmes lors de la conception de nombreux systèmes en ingénierie.A la lumière de cesétudes récentes, il est donc nécessaire d'approfondir l'étude des comportements de plusieurs corps placés les uns derrière les autres dans unécoulement transverse et montésélastiquement. Miseà part les fortes oscillations observées, de nombreux aspects des WIV de plusieurs cylindres en ligne restent très mal connus : les réponses fréquentielles et les amplitudes maximales produites, l'influence du nombre de Reynolds de l'écoulement, les effets dusà des ratios de masse ou des facteurs de masse amortissement faibles, etc.Cette thèse viseà explorer numériquement les réponses d'oscillations induites par sillage de 3 cylindres circulaires disposés en ligne et ayant un nombre de masse faible et un amortissement nul pour de faibles nombres de Reynolds. Pour atteindre cet objectif de recherche, on procède en troisétapes. La premièreétape consisteà s'assurer que l'outil numérique utilisé pour effectuer les simulations est correctement implémenté. Les tests de vérification du code sont basés sur v la méthode de la solution manufacturée pour des problèmes d'interactions fluide-structure où la structure peutêtre modélisée comme un corps rigide. Aucune solution manufacturée pour de type de problèmes n'est disponible. Ainsi on a développé une procédure générique pour produire des solutions manufacturées afin de vérifier les codes de calcul d'interactions fluide-structure. Cette procédure est appliquéeà des cas bi-et tridimensionnels. Une comparaison entre les résultats obtenus et desétudes expérimentales pour un nombre de masse faible et des nombres de Reynolds modérémentélevés indique que les réponses ne sont pas identiques. Cependant, nos résultatsà bas nombres de Reynolds reproduisent l'essentiel des caractéristiques des réponses pour des nombres de Reynolds plusélevés. Par conséquent, la simulationà bas nombres de Reynolds des VIV, et par extension des WIV, permet de représenter qualitativement les caractéristiques principales des réponsesà nombres de Reynolds plusélevés.Dans une troisième partie, onétudie les réponses des vibrations induites par sillage de 3 cylindres circulaires disposés en ligne. On considère des ratios de masse faibles et un amortissement nulà bas nombres de Reynolds. On compare ces résultats avec ceux de 2 cylindres en tandem et ceux d'un seul cylindre dans les mêmes conditions. La présence du troisième cylindre induit des différences significatives par rap...

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Experimental Study on Structure of Gas Flow in Tube Banks with Tube Axes Normal to Flow : Part 1, Karman Vortex Flow from Two Tubes at Various Spacings

Cited by 167 publications

References 0 publications

Effect of unequal cylinder spacing on vortex streets behind three side-by-side cylinders

Effect of unequal cylinder spacing on vortex streets behind three side-by-side cylinders

Flow-Induced Vibration of Circular Cylindrical Structures

Flow-induced vibrations of in-line cylinder arrangements at low Reynolds numbers

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