Modeling of the dynamics of a slug of liquid oxygen in a magnetic field and experimental verification

Boulware, Jeffrey C.; Ban, Heng; Jensen, Scott; Wassom, Steven R.

doi:10.1016/j.cryogenics.2010.03.004

Cited by 4 publications

(6 citation statements)

References 13 publications

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“…The lack of correlation implied that as the physical scale of the experiment increased, the uncertainties could not be extrapolated. A previous study [25] showed that the amplitude of the oscillations were more significantly affected by the damping factor than the hidden slug length, which likely remained fairly constant during the set of runs. As the initial position of the slug deviated from the center of the solenoid, the maximum velocity of the slug increased as well.…”

Section: Resultsmentioning

confidence: 96%

“…While the process allowed for precise measurement of the slug length within 0.8 mm, an unknown amount of LOX remained in the steel sections. The mass of LOX that could not be seen was dubbed the hidden slug length but could be precisely calculated through the frequency of the pressure oscillations [25].…”

Section: Methodsmentioning

confidence: 99%

“…A short slug could experience the same amount of magnetic force for much less damping and inertia than a long column. The experiments were verified with a theoretical model which, when implemented in a numerical simulation, demonstrated the effects of experimental uncertainty and measurement errors [25]. The experiment and theoretical model provided valuable data on the viability of LOX as a magnetic working fluid, but did not address the importance of the influence of geometry on its dynamics.…”

Section: Liquid Oxygenmentioning

confidence: 99%

“…The oscillatory motion, finite slug length, and unknown magnetoviscous effects complicate the damping force on the one-dimensional analysis. These effects were treated as having a combined effect on the wall shear stress through a damping factor, f. Using data from one experimental run, the damping factor could be calculated through the decaying amplitude of the oscillations and then applied to every run performed within the same time frame as long as no changes to the experiment were made [25]. The use of the damping factor allows the development of the current theoretical model before a comprehensive multi-dimensional model accounting for all the contributing factors can be developed.…”

Section: Theory and Numerical Simulationmentioning

confidence: 99%

See 3 more Smart Citations

Influence of geometry on liquid oxygen magnetohydrodynamics

Boulware¹,

Ban²,

Jensen³

et al. 2010

Experimental Thermal and Fluid Science

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Section: Resultsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Liquid Oxygenmentioning

confidence: 99%

Section: Theory and Numerical Simulationmentioning

confidence: 99%

See 2 more Smart Citations

Influence of geometry on liquid oxygen magnetohydrodynamics

Boulware¹,

Ban²,

Jensen³

et al. 2010

Experimental Thermal and Fluid Science

Self Cite

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“…For example, the liquid-vapor density ratios, latent heats and surface tensions of liquid oxygen and nitrogen are much smaller than those of water. Moreover, liquid oxygen is paramagnetic, and has a positive and high susceptibility [8], which makes it easier to be controlled by the magnetic field [9]. Because of these specific physical properties, the atomization, phase change and interface evolution characteristics of the cryogenic two-phase flow under magnetic field may have certain particularity, which up to now have not been well understood.…”

Section: Introductionmentioning

confidence: 99%

Free-surface flow of liquid oxygen under non-uniform magnetic field

et al. 2017

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The paramagnetic property of oxygen makes it possible to control the two-phase flow at cryogenic temperatures by nonuniform magnetic fields. The free-surface flow of vapor-liquid oxygen in a rectangular channel was numerically studied using the two-dimensional phase field method. The effects of magnetic flux density and inlet velocity on the interface deformation, flow pattern and pressure drop were systematically revealed. The liquid level near the high-magnetic channel center was lifted upward by the inhomogeneous magnetic field. The interface height difference increased almost linearly with the magnetic force. For all inlet velocities, pressure drop under 0.25 T was reduced by 7-9% due to the expanded local cross-sectional area, compared to that without magnetic field. This work demonstrates the effectiveness of employing nonuniform magnetic field to control the free-surface flow of liquid oxygen. This non-contact method may be used for promoting the interface renewal, reducing the flow resistance, and improving the flow uniformity in the cryogenic distillation column, which may provide a potential for enhancing the operating efficiency of cryogenic air separation.

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The effect of magnetic field on the dynamics of gas bubbles in water electrolysis

Chen

2021

Sci Rep

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This study determines the effect of the configuration of the magnetic field on the movement of gas bubbles that evolve from platinum electrodes. Oxygen and hydrogen bubbles respectively evolve from the surface of the anode and cathode and behave differently in the presence of a magnetic field due to their paramagnetic and diamagnetic characteristics. A magnetic field perpendicular to the surface of the horizontal electrode causes the bubbles to revolve. Oxygen and hydrogen bubbles revolve in opposite directions to create a swirling flow and spread the bubbles between the electrodes, which increases conductivity and the effectiveness of electrolysis. For vertical electrodes under the influence of a parallel magnetic field, a horizontal Lorentz force effectively detaches the bubbles and increases the conductivity and the effectiveness of electrolysis. However, if the layout of the electrodes and magnetic field results in upward or downward Lorentz forces that counter the buoyancy force, a sluggish flow in the duct inhibits the movement of the bubbles and decreases the conductivity and the charging performance. The results in this study determine the optimal layout for an electrode and a magnetic field to increase the conductivity and the effectiveness of water electrolysis, which is applicable to various fields including energy conversion, biotechnology, and magnetohydrodynamic thruster used in seawater.

show abstract

Modeling of the dynamics of a slug of liquid oxygen in a magnetic field and experimental verification

Cited by 4 publications

References 13 publications

Influence of geometry on liquid oxygen magnetohydrodynamics

Influence of geometry on liquid oxygen magnetohydrodynamics

Free-surface flow of liquid oxygen under non-uniform magnetic field

The effect of magnetic field on the dynamics of gas bubbles in water electrolysis

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