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Effects of Electromagnetic Forcing on Self-Sustained Jet Oscillations

Effects of Electromagnetic Forcing on Self-Sustained Jet Oscillations, R. Kalter, M. J. Tummers, S. Kenjeres, B. W. Righolt, and C. R. Kleijn. Physics of Fluids 2014, 26  (6), 065101.

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Abstract

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-southnorth 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 N-c was found. For N < N-c, the jet oscillates with a constant Strouhal number St, independent of the Reynolds number Re. For N > N-c and an oscillation enhancing up-down-up configuration of the Lorentz force, St grows with N as St. v N. In contrast, for N > N-c and an oscillation suppressing down-up-down configuration of the Lorentz force, all jet oscillations are suppressed. (C) 2014 AIP Publishing LLC.

BibTeX

@article{ ISI:000341175200025,
Author = {Kalter, R. and Tummers, M. J. and Kenjeres, S. and Righolt, B. W. and Kleijn, C. R.},
Title = {Effects of Electromagnetic Forcing on Self-Sustained Jet Oscillations},
Journal = {Physics of Fluids},
Year = {2014},
Volume = {26},
Number = {6},
Month = {},
Abstract = {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-southnorth 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 N-c was found. For N < N-c, the jet oscillates with a constant Strouhal number St, independent of the Reynolds number Re. For N > N-c and an oscillation enhancing up-down-up configuration of the Lorentz force, St grows with N as St. v N. In contrast, for N > N-c and an oscillation suppressing down-up-down configuration of the Lorentz force, all jet oscillations are suppressed. (C) 2014 AIP Publishing LLC.},
DOI = {10.1063/1.4880897},
Pages = {065101},
ISSN = {1070-6631},
EISSN = {1089-7666},
Unique-ID = {ISI:000341175200025},
}

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