Fundamental Investigation of an Electromagnetic Degasser.

Okusawa, Tsutomu; Kojima, Yoshio; Tsubouchi, Kota; Takagi, Yuusuke; Hamano, Nobuo

doi:10.1299/kikaic.58.3543

Cited by 7 publications

(4 citation statements)

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“…The measured values of b u decrease slightly in the z direction due to the Coanda effect and are much smaller than the value calculated from Eq. (14). The ratio of b a to b u was approximately 0.7.…”

Section: Axial and Horizontal Mean Velocity Componentsmentioning

confidence: 89%

“…[6][7][8][9][10][11][12][13][14] For example, Inoue et al 15) and Mizuno et al 16) proposed a bubble removal method by focusing on the fact that small bubbles in a water-air two-phase flow in a pipe of poor wettability are likely to attach to the inner wall of the pipe. Accordingly, bubbles in a molten metal bath can also be removed by trailing a solid body of poor wettability in the bath because the bubbles are trapped on it.…”

Section: Introductionmentioning

confidence: 99%

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The Coanda Effect on Bubbling Jet behind a Horizontally Placed Circular Cylinder.

et al. 2002

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The motions of bubbles and liquid behind a circular cylinder placed horizontally in a vertical water-air bubbling jet were experimentally investigated. Bubbles approaching the cylinder were separated by the cylinder in the two ways along the side wall of the cylinder, and they gathered together again at a certain distance from the cylinder due to the Coanda effect. This situation was confirmed from the measurements of gas holdup and mean water velocity components. The mean bubble diameter behind the cylinder became small because disintegration of bubbles took place around the cylinder. The mean bubble rising velocity also became very low behind the cylinder. The horizontal spreading of the bubbling jet was significantly suppressed by the cylinder.

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Section: Axial and Horizontal Mean Velocity Componentsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

The Coanda Effect on Bubbling Jet behind a Horizontally Placed Circular Cylinder.

et al. 2002

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“…The present study shows the potential use of magnetic buoyancy to control bubbles in space applications. Several investigators have reported methods of controlling bubbles by using Lorentz forces, 15 centrifugal forces, and electrostatic forces. 16 The first method is only applicable to conducting fluids.…”

Section: Discussionmentioning

confidence: 99%

Magnetic buoyancy force acting on bubbles in nonconducting and diamagnetic fluids under microgravity

Wakayama

1997

Journal of Applied Physics

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The magnetic buoyancy force acting on a bubble in a one-dimensional magnetic field can be represented as Fϭ( G Ϫ L )͐H(dH/dx)dVol B , where G and L are the volume magnetic susceptibilities of the gas and liquid, respectively, and H is the magnetic field strength. Since ͉ L ͉ ӷ͉ G ͉ and most liquids are diamagnetic, this expression indicates that the magnetic buoyancy forces act in the direction of increasing magnetic field strength. Because the magnetic buoyancy force in a diamagnetic fluid is small, the motion of bubbles under normal gravity is difficult to study, but microgravity offers the possibility of detailed observations. Using a compact permanent magnet under microgravity conditions, N 2 bubbles in pure water ͑0.01 dyne s/cm 2 ) and in a 69:31 glycerol/ water mixture ͑0.21 dyne s/cm 2 ) were found to move in the direction of increasing H, and to be held stationary at the point of maximum H. The motion of the bubbles was also simulated with a theoretical model and was found to agree with measurements made under microgravity conditions. These results indicate that magnetic buoyancy can be used to control bubble motion. Since most fluids are diamagnetic, magnetic buoyancy can be used to control bubbles in many fluidic devices used in space applications.

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“…( 1 ) Centrifugal force method (1), (2) , ( 2 ) Ultrasonic method (3), (4) , ( 3 ) Surface tension difference method (5) - (7) , ( 4 ) Electrostatic force method (8) , ( 5 ) Electromagnetic force method (9) - (11) , ( 6 ) Y-junction of different branch angle (12), (15) , ( 7 ) Y-junction of different wettability (16) - (18) .…”

Section: Introductionmentioning

confidence: 99%

Separation of Gas from Downward Gas-Liquid Two-Phase Flow Using a Y-Junction of Poor Wettability

Ishiguro

Iguchi

Mizuno

et al. 2004

JSME international journal. Ser. B, Fluids and thermal engineer

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A Y-junction made of transparent acrylic resin was placed vertically downward. One side of the Y-junction was coated with repellent to change its wettability. As a result, the wettability of that side became poor, while the wettability of the other side was originally good. Straight pipes were connected to the main pipe and two branches of the Y-junction. A downward air-water two-phase flow was introduced into the main pipe. The air attached preferably to the poorly wetted side of the main pipe and entered into the poorly wetted branch. When the superficial velocities of air and water, j g and j w , were less than their respective critical values, air was completely distributed into the poorly wetted branch, and thus, the gas separation efficiency was 100%. An empirical equation was proposed for predicting the critical values of j g and j w .

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Fundamental Investigation of an Electromagnetic Degasser.

Cited by 7 publications

References 0 publications

The Coanda Effect on Bubbling Jet behind a Horizontally Placed Circular Cylinder.

The Coanda Effect on Bubbling Jet behind a Horizontally Placed Circular Cylinder.

Magnetic buoyancy force acting on bubbles in nonconducting and diamagnetic fluids under microgravity

Separation of Gas from Downward Gas-Liquid Two-Phase Flow Using a Y-Junction of Poor Wettability

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