Experimental investigation of the interaction of two cylinders in the flow pattern

Vitkovičová, Rut; Nožička, Jiří; Skala, Václav

doi:10.1051/epjconf/20159202110

Cited by 4 publications

(8 citation statements)

References 5 publications

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“…Figure 8 shows a previous visualization result [10] and the visualization result obtained in this experiment. Here, although both have some difference at experimental conditions, it is a comparatively near case.…”

Section: Comparison Of Aspect Of Flow By Different Visualization Techmentioning

confidence: 99%

“…Yokoi and Hirao [5][6][7][8][9] is reporting the result of the study shown by the streak line about the vortex shedding from the circular cylinder which is oscillating in the direction of flow using the flow visualization technique based on a pouring streak method. Rut et al [10,11] is reporting the result of study which showed the interference flow from two circular cylinders arranged staggered using the flow visualization technique based on a suspension method by the particle pass line. Then, the visualization experiment by the streak line method was performed on the same conditions as a previous experiment for the database creation in comparison with the previous experimental result [10].…”

Section: Introductionmentioning

confidence: 99%

“…Rut et al [10,11] is reporting the result of study which showed the interference flow from two circular cylinders arranged staggered using the flow visualization technique based on a suspension method by the particle pass line. Then, the visualization experiment by the streak line method was performed on the same conditions as a previous experiment for the database creation in comparison with the previous experimental result [10].…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of the mutual interference flow of two circular cylinders by flow visualization

Yokoi

Vitkovičová

2017

EPJ Web Conf.

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Abstract. In order to understand the aspect of the mutual interference flow from two circular cylinders, the visual observation experiment was performed by use a water flow apparatus. The purpose of this study is accumulation of the basic image data for comparing with numerical computation or previous experimental results. In this report, the intervals of two circular cylinders were varied, the visualization experiment was performed, and the vortex shedding characteristics and the flow pattern in each case were investigated. The cylinder setting conditions were seven kinds (the position of the rear-side circular cylinder is changed). The cylinder diameter ratios were four kinds (D/d=1.0, 1.67, 2.5 and 5.0). The variation of Reynolds number was three kinds (Re=548.7, 1200 and 2500). The dye oozing streak method was used in this visualization experiment. Although the previous PIV experimental result and present result obtained the same flow feature, the aspect of an interference flow became clear by changing the color of tracer ink.

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Section: Comparison Of Aspect Of Flow By Different Visualization Techmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of the mutual interference flow of two circular cylinders by flow visualization

Yokoi

Vitkovičová

2017

EPJ Web Conf.

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“…This article describes an experimental measurement of the influence of cylinders in the flow field in staggered configuration using the CTA method and presents the results of these measurements. This paper follows the measurements published in [7]. …”

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confidence: 63%

Interaction of two circular cylinders in the flow field at low Reynolds numbers

Vitkovičová

Skala

2016

EPJ Web of Conferences

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Abstract.A set of points of a velocity fluctuation was measured in the wake behind the two circular cylinders by CTA method. Measurements were carried out for several positions of the secondary cylinder in the wake of primary cylinder and for a set of modes of low Reynolds number (Re max 2600). The goal was to obtain a set of data and information about the influence of the secondary cylinder on the primary cylinder. ,QWURGXFWLRQInvestigating the mutual influence of two or more cylinders in the flow field is the theme of many works in the field of fluid mechanics and related fields, but nevertheless it is still an open problem which is not fully resolved. Understanding the mutual influence of cylinders in the flow field allows us among other things, to understand the phenomena taking place in geometrically similar applications in technology, e.g. construction (e.g. the chimney towers), engineering etc., and also allows to find areas affecting the wake of the dominant cylinder. M. M. Zdravkovich in his review [1] deals with an observation of an influent of two cylinders in a configuration tandem and a staggered arrangement. Hwang and Choi introduce in [2] with works that deal with a control of wake on the one hand passively and other actively. They comparing the area of influence of the secondary cylinder on primary cylinder in research Strykowski and Sreenivasan in [3] with the results of Hwang and Choi [4]. D. Sumner in his article [5] clearly summarizes several studies by authors engaged in research of wake behind a cylinder in a number of settings and gives an overview of the performed measurements, measuring apparatuses and measuring stands. Overview of the measured dependence Strouhal number ratio gap between the cylinders in a parallel arranged and comparing them with the results of other authors is given in a paper from Yokoi [6]. This article describes an experimental measurement of the influence of cylinders in the flow field in staggered configuration using the CTA method and presents the results of these measurements. This paper follows the measurements published in [7]. 0HDVXUHPHQWV ([SHULPHQWDO WXQQHO DQG PHDVXUHPHQW WHFKQLTXHVThe measurement by method CTA carried out in an Eifffel type wind tunnel which has a speed range of approximately 0-20 m / s. The intensity of turbulence in the tunnel is around 1.1%. A test section of the tunnel is closed. The length of the test section is 750 mm and its cross section is 300 mm x 200 mm. The test section is equipped with a movable system which enables automatic 3D positioning of the probe. Tunnel control, monitoring and data logging and control of movable system are performed by software written in LabView programming environment. The tunnel was fitted with a measuring system for the hot wire anemometers MiniCTA 54T30 (Dantec Dynamics) with 55P16 HW-probes for the measurements. The hot wire and cylinders are shown in Figure 1.

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“…This paper is based on measurements published in [1] and [2]. These articles outline the influence of the secondary cylinder on the wake of the primary cylinder for various combinations of staggered configuration.…”

Section: Introductionmentioning

confidence: 99%

Dominant frequencies in the wake of the two cylinders

Vitkovičová¹,

Skala²

2016

AIP Conference Proceedings

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Abstract. This article discusses the results of the spot measurement of the velocity fluctuation in the wake of two cylinders for two mutual positions and two modes of Reynolds numbers obtained using a hot wire probe (CTA method). The measurement for each setting was done at 121 points located mainly in the wake of both cylinders. The obtained fluctuations were used to evaluate the frequency spectrum, according to which the presence of the dominant frequency was ascertained. Subsequently, the maps of positions of dominant frequencies in the wake were created for both settings of the cylinders and for both modes of Reynolds numbers.

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Experimental investigation of the interaction of two cylinders in the flow pattern

Abstract: ([SHULPHQWDO LQYHVWLJDWLRQ RI WKH LQWHUDFWLRQ RI WZR F\OLQGHUV LQ WKH IORZ SDWWHUQ

Cited by 4 publications

References 5 publications

Experimental investigation of the mutual interference flow of two circular cylinders by flow visualization

Experimental investigation of the mutual interference flow of two circular cylinders by flow visualization

Interaction of two circular cylinders in the flow field at low Reynolds numbers

Dominant frequencies in the wake of the two cylinders

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