Electromagnetic control of an oscillating turbulent jet in a confined cavity

Journal article (2016)

Authors

B.W. Righolt ChemE/Transport Phenomena - AS
S. Kenjeres ChemE/Transport Phenomena - AS
R. Kalter ChemE/Transport Phenomena - AS
M.J. Tummers Fluid Mechanics - Mechanical, Maritime and Materials Engineering
C.R. Kleijn ChemE/Transport Phenomena - AS
Research Group
ChemE/Transport Phenomena (AS) (TU Delft)
Copyright: © 2016 B.W. Righolt, S. Kenjeres, R. Kalter, M.J. Tummers, C.R. Kleijn
DOI: https://doi.org/10.1016/j.ijheatfluidflow.2016.09.007
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Published Date

2016

Language

English

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Transport Phenomena

Abstract

Control of self-sustained jet oscillations in confined cavities is of importance for many industrial applications. It has been shown that the mechanism underlying these oscillations consists of three stages: (i) growth of the oscillation, (ii) amplitude limitation and (iii) delayed destruction of the recirculation zone bounding the jet. It has also been shown that oscillations may be enhanced or suppressed by applying (e.g. electromagnetic) body forces.

In the current paper we study the influence of electromagnetic forces oriented aligned with or opposite to the direction of the jet on the oscillation mechanism. The influence of the forcing is found to depend on the Stuart number N in relation to a critical Stuart number Ncrit. We demonstrate that for |N| < Ncrit , the oscillation mechanism is essentially unaltered, with moderate modifications in the jet oscillation amplitude and frequency compared to N=0N=0. For N > Ncrit, electromagnetic forcing leads to total suppression of the self-sustained oscillations. For N < Ncrit , electromagnetic forces dominate over inertia and lead to strongly enhanced oscillations, which for N≪−NcritN≪−Ncrit become irregular.

As was earlier demonstrated for N=0,N=0, the present paper shows that for −6Ncrit