Effects of electromagnetic forcing on self-sustained jet oscillations

R Kalter, MJ Tummers, S Kenjeres, BW Righolt, CR Kleijn

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)1-18
Number of pages18
JournalPhysics of Fluids
Volume26
Issue numberart.nr. 065101
DOIs
Publication statusPublished - 2014

Keywords

  • CWTS 0.75 <= JFIS < 2.00

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