Liquid-metal magnetohydrodynamics with strong magnetic fields: a report on Euromech 70

Hunt, J. C. R.; Moreau, R.

doi:10.1017/s0022112076002449

Cited by 25 publications

(14 citation statements)

References 20 publications

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“…Equations [13] and [14] show that the motion of particle 1 Ϫ 0.75857 k 5 1 Ϫ 2.1050 k ϩ 2.0865 k 3 Ϫ 1.7068 k 5 ϩ 0.72603 k 6 is determined by five nondimensional parameters: Re, R H , ␥, k, and Fr. Among them, Re and R H are related to the flow field.…”

Section: Resultsmentioning

confidence: 99%

“…Leenov and Kolin [15] magnetic separation [3,4] and its application to the design of derived the electromagnetic force on a spherical particle split tundish in continuous casting to move the inclusions whose electrical conductivity is different from that of the to the wall of the heating system [5] and to conventional surrounding liquid. Shilova [1] studied the motion of nonconcasting mold to move inclusions to the boundary of the ducting particles suspended in a stagnant conducting liquid solidifying shell, [6] the filtration of non-metallic inclusions contained within a cylindrical tube through which a uniform by pumping the melt through a bundle of current-applied electric current flows along the axis. He found that the thin pipes in aluminum scrap recycling, [7] as well as the pinch force generated by the electric current and its induced on-line liquid metal cleanliness analyzer (LiMCA) [8,9] by magnetic field was directed along the radius toward the measuring the voltage pulse produced when a particle with center of the tube and was balanced by a radial pressure different electrical conductivity from that of liquid metal gradient, resulting in an outward radial motion of the particle passes through an electric sensing zone (ESZ), [10] a small towards the tube wall.…”

Section: Introductionmentioning

confidence: 99%

“…Wall be calculated from Ohm's law, which is described in Eqs. effects of the pipe inner surface on the particle trajectory [5] and [6], because the secondary current induced by the were also considered. The model developed in this work convective motion of the liquid metal is negligible.…”

Section: Introductionmentioning

confidence: 99%

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Numerical studies of the motion of particles in current-carrying liquid metals flowing in a circular pipe

Guthrie

2000

Metall Mater Trans B

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A mathematical model has been developed to describe the motion of particles in current-carrying liquid metals flowing through a cylindrical pipe. The fluid velocity field was obtained by solving the Navier-Stokes equations, and the trajectories of particles were calculated using equations of motion for particles. These incorporate the drag, added mass, history, electromagnetic, and fluid acceleration forces. The results show that particle trajectories are affected by the magnetic pressure number R H , the Reynolds number Re, the blockage ratio k, and the particle-fluid density ratio ␥ according to the relative importance of associated force terms. In the axial direction, the particles follow the fluid velocity closely and will move further axially before reaching the wall as the fluid velocity (Re) increases. In the radial direction, the outwardly directed electromagnetic force on the particle increases with radial distance from the axis, with increasing electric current (R H ), and increasing size (k) of particle. The competition between the electromagnetic force and the radial fluid acceleration force in the entrance region results in particle movement toward the central axis before moving toward the wall for small electric current (low R H ) and directly toward the wall for large current (high R H ). The low inertia (␥) bubbles move faster toward the wall than heavier particles do. The radial velocity of the particle movement as it approaches the wall is predicted to decrease due to wall effects. This model has been applied to the movement of inclusions within the electric sensing zone (ESZ) of the liquid metal cleanliness analyzer (LiMCA) system in molten aluminum, and it was proved that LiMCA system could be used in aluminum industries.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical studies of the motion of particles in current-carrying liquid metals flowing in a circular pipe

Guthrie

2000

Metall Mater Trans B

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“…Then, a Euromech colloquium was organised in Villard de Lans, France, gathering representatives of the most established groups of specialists and aiming at detecting potential applications of MHD. For the first time, the conclusions of such a meeting [1] clearly focused on metallurgical applications. They were the basis on which the joint research program MADYLAM (MAgnetoDYnamics of Liquids, Appli-cations to Metallurgy), gathering three groups from different research units (mechanical engineering, metallurgy and electrical engineering), supported by CNRS, the French Ministry for Industry, and industrial partners such as Pechiney and IRSID, was launched in France, in 1978.…”

Section: Introduction: History and Backgroundmentioning

confidence: 99%

Magnetohydrodynamics applied to materials processing

Fautrelle

Ernst

Moreau

2009

International Journal of Materials Research

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In the processing of liquid materials various operations are performed, e. g., alloying, homogenisation of the composition, refining or inclusion removal. As was realised early on by Charles Crussard, electromagnetic effects can be used to process electrically conducting materials without any contact. When alternating magnetic fields are used, the material is directly heated and melted thanks to the induced electric currents. The induced electromagnetic forces are capable of shaping the free surface, levitating a liquid blob and stirring the liquid bulk or its surface. The latter principle may be applied to electrically conducting liquids such as metallic alloys, but also to poorly conducting materials such as oxides, glasses or plasmas. Those effects are used in many processes such as induction furnaces for liquid metals or glasses, refining ladles, electromagnetic levitation, continuous casting of aluminium or steel. In this paper, typical effects based on the use of electromagnetic systems are reviewed, as well as the corresponding applications.

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“…Innovative electro-magnetic energy conversion device has been developed based on the insights from the previous theoretical and experimental researches on liquid metal magnetohydrodynamic (MHD) power generator (Hunt and Moreau, 1976, Kobayashi et al, 2012, Hu et al, 2015, Yamaguchi et al, 2008, Niu et al, 2012 and also on MHD viscous coupler or hydrostatic thrust bearing utilizing liquid metal (Kamiyama and Sato, 1973). The developed device has coaxial configuration with liquid metal filled inside under applied magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Development and fundamental characteristics of co-axial MHD energy conversion device

Takana

Tanida

2017

Mechanical Engineering Journal

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Innovative electro-magnetic energy conversion device has been developed. This device has co-axial configuration with liquid metal filled inside under applied magnetic field. The azimuthal liquid metal flow is decelerated by Lorentz force acting as a body force. The rotational torque continuously increases with excessive kinetic energy converted into electric energy by increasing magnetic field. The static and dynamic characteristics of the device have experimentally investigated with AC servo-motor as a driving source. The experimental results show that the rotational torque can be controlled with electric power extraction by applied magnetic field and external load resistance. The liquid metal inside the device is driven in the azimuthal direction directly by the electrically insulated propeller on the shaft and the electric power is extracted with proportionally to the square of shaft rotational speed. The required rotational torque increases with applied magnetic flux density due to dominant eddy current induced by non-uniform magnetic field in azimuthal direction. The constant rotational speed can be maintained with power generation by controlling applied magnetic flux density even for increasing input torque. It was clarified that the time constant for the control of the rotational speed becomes smallest when the changing time of applied magnetic flux density and that of input torque are equal. IntroductionInnovative electro-magnetic energy conversion device has been developed based on the insights from the previous theoretical and experimental researches on liquid metal magnetohydrodynamic (MHD) power generator (Hunt and Moreau, 1976, Kobayashi et al., 2012, Hu et al., 2015, Yamaguchi et al., 2008, Niu et al., 2012 and also on MHD viscous coupler or hydrostatic thrust bearing utilizing liquid metal (Kamiyama and Sato, 1973). The developed device has coaxial configuration with liquid metal filled inside under applied magnetic field. As described later, the rotating shaft and outer electrode are in direct contact with liquid metal and the liquid metal is driven in the a azimuthal direction directly by the electrically insulated propeller on the shaft under magnetic field applied in perpendicular to the liquid metal flow. Therefore, the friction loss between liquid metal and outer electrode remains low, which could be a merit of using liquid metal instead of solid metal.In this device, the kinetic energy is directly transfered to electric energy according to the Faraday's law and shaft rotational torque increases with magnetic field by Lorentz force acting against the liquid metal flow. Since Lorentz force is acting liquid metal flow as a body force and the shaft is directly in contact with the liquid metal, the rotational torque responses rather fast to the magnetic field. This could be a great merit for the industrial application where quick control of the rotational torque is required. Because of the advantage of fast response and co-axial configuration of the device, this device can be applied to ...

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Liquid-metal magnetohydrodynamics with strong magnetic fields: a report on Euromech 70

Cited by 25 publications

References 20 publications

Numerical studies of the motion of particles in current-carrying liquid metals flowing in a circular pipe

Numerical studies of the motion of particles in current-carrying liquid metals flowing in a circular pipe

Magnetohydrodynamics applied to materials processing

Development and fundamental characteristics of co-axial MHD energy conversion device

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