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Calming the waves, not the storm : measuring the Kelvin–Helmholtz instability in a tangential magnetic field

Title data

Kögel, Armin ; Völkel, Alexandra ; Richter, Reinhard:
Calming the waves, not the storm : measuring the Kelvin–Helmholtz instability in a tangential magnetic field.
In: Journal of Fluid Mechanics. Vol. 903 (2020) . - No. A47.
ISSN 0022-1120
DOI: https://doi.org/10.1017/jfm.2020.642

Abstract in another language

We measure the Kelvin–Helmholtz instability in between a layer of a diamagnetic fluid flowing in a channel and a layer of ferrofluid resting on top. When the diamagnetic fluid exceeds a critical flow velocity the interface in between both fluids becomes unstable and waves develop. It has been predicted by Sutyrin & Taktarov (J. Appl. Math. Mech., vol. 39, 1975, pp. 520–524) that a homogeneous magnetic field, oriented horizontally, stabilizes the liquid interface. To test this prediction we apply in a closed flow channel a local periodic perturbation of the interface by magnetic or mechanic means. From the measured growth and decay rates of the interface undulations we determine the critical flow velocity for various driving frequencies and applied magnetic fields. In this way we confirm quantitatively the stabilizing effect of the horizontal field. Moreover we measure the dispersion relation of the interfacial waves.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Flow Control; Instability control; MHD and Electrohydrodynamics; Magnetic Fluids
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V > Chair Experimental Physics V - Univ.-Prof. Dr. Ingo Rehberg
Profile Fields > Advanced Fields > Nonlinear Dynamics
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V
Profile Fields
Profile Fields > Advanced Fields
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V > Chair Experimental Physics V - Univ.-Prof. Dr. Oliver Bäumchen
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 06 Oct 2020 05:32
Last Modified: 29 Oct 2020 12:17
URI: https://eref.uni-bayreuth.de/id/eprint/57860