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Quasi-2D Monte Carlo Simulations of Phase Transitions and Internal Aggregate Structures in a Highly Dense Suspension Composed of Magnetic Plate-Like Particles

[+] Author Affiliations
Yasuhiro Sakuda, Akira Satoh

Akita Prefectural University, Yurihonjo, Akita, Japan

Paper No. IMECE2009-10981, pp. 103-110; 8 pages
doi:10.1115/IMECE2009-10981
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

We have investigated phase transitions and internal aggregate structures of a highly dense suspension composed of magnetic plate-like particles with a magnetic moment normal to the particle axis, by means of the Monte Carlo method. In the present study, we have considered a quasi-2D system in order to clarify the influences of volumetric fraction of particles and magnetic field strength on particle aggregations and phase transitions. Internal structures of particle aggregates have been discussed quantitatively in terms of pair correlation and orientational pair correlation functions. The main results obtained here are summarised as follows. When the influence of magnetic interactions between particles is of the same order of the magnetic field strength, the particles form column-like clusters, and the internal structure of a suspension shows solid-like structures. For the case of strong applied magnetic field, the internal structure is transformed from solid-like structures into isotropic ones. However, as the volumetric fraction increases, the particles form brick wall-like structures under circumstances of a strong applied magnetic field, and the internal structure exhibits solid-like ones.

Copyright © 2009 by ASME

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