Direct Observation of the Free Surface Behavior of a Molten Metal under the Imposition of an Intermittent Alternating Magnetic Field

2000 ◽  
Vol 86 (8) ◽  
pp. 514-518
Author(s):  
Yueming ZHOU ◽  
Kazuhiko IWAI ◽  
Shigeo ASAI
Keyword(s):  
Magnetic Field ◽  
Free Surface ◽  
Molten Metal ◽  
Direct Observation ◽  
Alternating Magnetic Field ◽  
Surface Behavior

scholarly journals Excitation of Waves on a Molten Metal by an Intermittent Alternating Magnetic Field

1996 ◽  
Vol 82 (12) ◽  
pp. 1047-1052 ◽  
Author(s):  
Yasumasa CHINO ◽  
Yoshio TOYAMA ◽  
Kazuhiko IWAI ◽  
Shigeo ASAI
Keyword(s):  
Magnetic Field ◽  
Molten Metal ◽  
Alternating Magnetic Field

Liquid Metal Free Surface Motion Submerged in an AC Magnetic Field

2007 ◽  
Vol 561-565 ◽  
pp. 1071-1074
Author(s):  
Kazuhiko Iwai ◽  
Shigeo Asai
Keyword(s):  
Magnetic Field ◽  
Free Surface ◽  
Liquid Metal ◽  
Standing Wave ◽  
Skin Layer ◽  
Alternating Magnetic Field ◽  
Liquid Gallium ◽  
Field Frequency ◽  
Surface Motion ◽  
The Magnetic Field

Free surface motion of a liquid metal submerged in an alternating magnetic field has been examined. A copper vessel filled with a liquid gallium is set in a coil for the imposition of the alternating magnetic field. The alternating magnetic field penetrates into a liquid gallium only from an upper free surface because thickness of the copper vessel is larger than the electromagnetic skin layer of copper. Time variation of displacement of the standing wave loop excited on the free surface is detected by a laser level sensor. The standing wave was suppressed not only by intensification of the magnetic field magnitude but also increase of the magnetic field frequency.

Oscillation Characteristics of Molten Metal Free Surface Under Compound Magnetic Field

2011 ◽  
Vol 18 (5) ◽  
pp. 25-30 ◽  
Author(s):  
An-yuan Deng ◽  
En-gang Wang ◽  
Yong-yi Xu ◽  
Xing-wu Zhang ◽  
Ji-cheng He
Keyword(s):  
Magnetic Field ◽  
Free Surface ◽  
Molten Metal ◽  
Metal Free ◽  
Oscillation Characteristics

scholarly journals Instability of a plane conducting free surface submitted to an alternating magnetic field

1998 ◽  
Vol 375 ◽  
pp. 65-83 ◽  
Author(s):  
Y. FAUTRELLE ◽  
A. D. SNEYD
Keyword(s):  
Magnetic Field ◽  
Free Surface ◽  
Growth Rates ◽  
Critical Magnetic Field ◽  
Hill Equation ◽  
Alternating Magnetic Field ◽  
Time Averaging ◽  
Weak Formulation ◽  
Field Frequency ◽  
The Stability

This paper considers the stability of a horizontal liquid-metal free surface in the presence of a horizontal alternating magnetic field. A weak formulation is used to derive a generalized Mathieu–Hill equation for the evolution of surface perturbations. Previous studies which rely on time-averaging the electromagnetic force over one field cycle have predicted a generally weak instability, but we find much larger growth rates near the resonances, where the surface wave frequency is an integral multiple of the field frequency. The method can be extended to include viscous and ohmic damping; the former has little effect, while the latter damps all waves except those whose frequency is close to the field frequency. Growth rates can be closely approximated by simple algebraic formulae, as can the critical magnetic field strength for the onset of instability.

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