Electromagnetic flow control of a bifurcated jet in a rectangular cavity. Kalter, R., Tummers, M., Kenjere?, S., Righolt, B., & Kleijn, C. International Journal of Heat and Fluid Flow, 2014.
abstract   bibtex   
The effect of Lorentz forcing on self-sustained oscillations of turbulent jets (Re=3.1?103) issuing from a submerged bifurcated nozzle into a thin rectangular liquid filled cavity was investigated using free surface visualization and time-resolved particle image velocimetry (PIV). A Lorentz force is produced by applying an electrical current across the width of the cavity in conjunction with a magnetic field. As a working fluid a saline solution is used. The Lorentz force can be directed downward (F L < 0) or upward (F L > 0), to weaken or strengthen the self-sustained jet oscillations. The low frequency self-sustained jet oscillations induce a free surface oscillation. When F L < 0 the amplitude of the free surface oscillation is reduced by a factor of 6 and when F L > 0 the free surface oscillation amplitude is enhanced by a factor of 1.5.A large fraction of the turbulence kinetic energy k=12ui'ui'[U+203E] is due to the self-sustained jet oscillations. A triple decomposition of the instantaneous velocity was used to divide the turbulence kinetic energy into a part originating from the self-sustained jet oscillation k osc and a part originating from the higher frequency turbulent fluctuations k turb. It follows that the Lorentz force does not influence k turb in the measurement plane, but the distribution of k osc can be altered significantly. The amount of energy contained in the self-sustained oscillation is three times lower when F L < 0 compared to the situation with F L > 0. ? 2014 Elsevier Inc.
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 title = {Electromagnetic flow control of a bifurcated jet in a rectangular cavity},
 type = {article},
 year = {2014},
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 keywords = {[Cavity flow, Continuous steel casting, Electrohyd},
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 abstract = {The effect of Lorentz forcing on self-sustained oscillations of turbulent jets (Re=3.1?10<sup>3</sup>) issuing from a submerged bifurcated nozzle into a thin rectangular liquid filled cavity was investigated using free surface visualization and time-resolved particle image velocimetry (PIV). A Lorentz force is produced by applying an electrical current across the width of the cavity in conjunction with a magnetic field. As a working fluid a saline solution is used. The Lorentz force can be directed downward (<inf>F L</inf> < 0) or upward (<inf>F L</inf> > 0), to weaken or strengthen the self-sustained jet oscillations. The low frequency self-sustained jet oscillations induce a free surface oscillation. When <inf>F L</inf> < 0 the amplitude of the free surface oscillation is reduced by a factor of 6 and when <inf>F L</inf> > 0 the free surface oscillation amplitude is enhanced by a factor of 1.5.A large fraction of the turbulence kinetic energy k=12ui'ui'[U+203E] is due to the self-sustained jet oscillations. A triple decomposition of the instantaneous velocity was used to divide the turbulence kinetic energy into a part originating from the self-sustained jet oscillation <inf>k osc</inf> and a part originating from the higher frequency turbulent fluctuations <inf>k turb</inf>. It follows that the Lorentz force does not influence <inf>k turb</inf> in the measurement plane, but the distribution of <inf>k osc</inf> can be altered significantly. The amount of energy contained in the self-sustained oscillation is three times lower when <inf>F L</inf> < 0 compared to the situation with <inf>F L</inf> > 0. ? 2014 Elsevier Inc.},
 bibtype = {article},
 author = {Kalter, R. and Tummers, M.J. and Kenjere?, S. and Righolt, B.W. and Kleijn, C.R.},
 journal = {International Journal of Heat and Fluid Flow}
}

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