Effects of electromagnetic forcing on self-sustained jet oscillations

Journal article (2014)
Department
ChemE/Chemical Engineering (AS) (TU Delft)
Copyright: © 2014 AIP Publishing
DOI: https://doi.org/doi:10.1063/1.4880897
Magnets Velocimetry Lorentz group Magnetic fields Velocity measurement
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Published Date

06-06-2014

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Source:

Physics of Fluids, 26, 2014

ISSN:

1070-6631

Source:

http://scitation.aip.org/content/aip/journal/pof2/26/6/10.1063/1.4880897

Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

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-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 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 ?N??? . In contrast, for N > N c and an oscillation suppressing down-up-down configuration of the Lorentz force, all jet oscillations are suppressed.

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