Experimental study of self-sustained oscillations in a confined jet

Maurel, Agnès; Ern, Patricia; Zielinska, B. J. A.; Wesfreid, José Eduardo

doi:10.1103/physreve.54.3643

Cited by 80 publications

(75 citation statements)

References 23 publications

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“…This critical velocity is no longer constant, which leads us to conclude that the length L is the main dimension which controls the vortex escape. This confirms that previous results [3,5,6] . From the critical velocity, we determine a critical Reynolds critique R ec for every observed mode.…”

Section: Vortex Frequency For Fifferent Cavities Shape Ratiosupporting

confidence: 83%

Characterization of Frequency Mode inside an Open Cavity for Different Shape Ratio

Khouloud¹,

Bouterra²,

Cafsi³

et al. 2008

American J. of Applied Sciences

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Abstract:A number of studies have referred to the existence of a vortex cell within an urban street canyon. The understanding of vortex dynamics or vorticity distribution is a such configuration is of great interest. This configuration was simulated by the interaction between a boundary layer and a cavity. Experimental characterization of the vortex structures evolution was developed by the technique of measure Particle Image Velocimetry (PIV). In this paper, we have studied and characterized experimentally by the technique of measure Laser Doppler Velocimetry (LDV) the vortex escape frequencies. Measurements were performed for different cavity shape ratio and for different mean velocities. Where the ratio between the shear instability process and the mechanisms of frequency selection which depend of the size of the cavity. The evolution of the system by the variation of the number of Strouhal according to the number of Reynolds, led us to a regrouping for every mode, permitting to really separate the mode the some of the other.

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Section: Vortex Frequency For Fifferent Cavities Shape Ratiosupporting

confidence: 83%

Characterization of Frequency Mode inside an Open Cavity for Different Shape Ratio

Khouloud¹,

Bouterra²,

Cafsi³

et al. 2008

American J. of Applied Sciences

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“…Figure 6 shows that the Strouhal number is independent of the Reynolds number, which is in accordance with results presented in literature. 5 …”

Section: Jet Oscillations Without Lorentz Forcing (N = 0)mentioning

confidence: 99%

“…1,2 Flows in which self-sustained oscillations occur are (amongst others): jets issuing into a thin cavity, [3][4][5][6][7][8][9] the flow over backward facing steps, 10,11 and flows over cavities. [12][13][14][15] The self-sustained oscillations have a much lower frequency than those produced by shear layer instabilities.…”

Section: Introductionmentioning

confidence: 99%

Effects of electromagnetic forcing on self-sustained jet oscillations

et al. 2014

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The influence of electromagnetic forcing on self-sustained oscillations of a jet issuing from a submerged nozzle into a thin vertical cavity (width W much larger than thickness T) has been studied using particle image velocimetry. A permanent Lorentz force is produced by applying an electrical current across the width of the cavity in conjunction with a magnetic field from three permanent magnets across its thickness. As a working fluid a saline solution is used. The magnetic field is in the north-south-north configuration, such that the Lorentz force can be applied in an up-down-up configuration or in a down-up-down configuration by switching the direction of the electrical current. A critical Stuart number Nc was found. For N < Nc, the jet oscillates with a constant Strouhal number St, independent of the Reynolds number Re. For N > Nc and an oscillation enhancing up-down-up configuration of the Lorentz force, St grows with N as St \documentclass[12pt]{minimal}\begin{document}$\propto \sqrt{\mathrm{N}}$\end{document}∝N. In contrast, for N > Nc and an oscillation suppressing down-up-down configuration of the Lorentz force, all jet oscillations are suppressed.

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“…An inherent property of the jet confined in a cavity is self-sustained oscillations due to different kind of impingements. Oscillations appear in both laminar [6,7] and turbulent [8,9] flow regimes and under various geometrical and boundary conditions [10,11]. In addition, the jet in a rectangular cavity under different conditions can be used as an excellent reference for testing and comparison of available experimental, theoretical and numerical methods and tools.…”

Section: Introductionmentioning

confidence: 99%

“…The jet controlling is of high importance in e.g., casting processes [1], chemical engineering [2,3,4], nuclear sciences [5], as a diagnostic tool for determining fluid properties, (e.g., [6] and references given therein), etc. An inherent property of the jet confined in a cavity is self-sustained oscillations due to different kind of impingements.…”

Section: Introductionmentioning

confidence: 99%