Dynamics of electromagnetic particle chains in an electromagnetic field

Nakayama, Nobuyuki; Kawamoto, Hiroyuki; Yamada, Satoshi; Sasakawa, Akiko

doi:10.1299/jsmeiip.2002.246

Cited by 1 publication

(2 citation statements)

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“…We conducted a numerical simulation by the Distinct Element Method based on the Paranjpe's formulation to clarify the mechanism of the chain formation and to calculate the three-dimensional chain configuration, the stiffness of the chain, and the resonant frequency of the chain vibration. (5)(6)(7) Model experiments were also conducted using a solenoid coil for generating the magnetic field and it was demonstrated that the calculation agreed fairly well with the experiment. In the experiment, however, the magnetic field for the chain formation was restricted to less than 0.01 T by the temperature rise of the solenoid coil due to the Joule's loss.…”

Section: Introductionmentioning

confidence: 70%

“…5,2007 density was less than 0.08 T. This result coincided with the preceding experimental result with the conventional solenoid coil. (5,6) When the field was further increased, however, the chain length was saturated at up to 0.4 T and then it was decreased at 1.2 T. This feature at the high magnetic field is an interesting new finding. The interval between chains became large in accordance with the increase of the chain length, because a total number of particles was constant.…”

Section: Journal Of Advanced Mechanical Design Systems and Manufactmentioning

confidence: 82%

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Formation of Magnetic Particle Chains in Ultra High Magnetic Field

Kawamoto

Teshima

Takahashi

et al. 2007

JAMDSM

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Magnetic particles form chain-like clusters in the magnetic field. This phenomenon is of interest in two separate fields, one is a development system of the laser printer and another is an electromagnetic manipulation of biological cells. Experiments on the chain formation in air and oil have been performed in the ultra high magnetic field created by a superconducting magnet. It has been clarified that the chain length first increased and then decreased in accordance with the increase of the magnetic field. The result has been confirmed by a numerical calculation with the Distinct Element Method that included the mechanical contact force between particles and the magnetic force due to the field created by the coil and adjacent magnetized particles. A periodic boundary condition was employed to perform realistic calculation in a reasonable calculation time. The effect of the density and the diameter of particles was investigated experimentally. The effect of the dry friction between particles was also examined by comparing experimental results performed in air and oil. Lastly, it has been discussed that the static stability of the chain was determined by a minimization principle of the potential energy that consists of the gravitational and magnetic potential energy.

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Section: Introductionmentioning

confidence: 70%