Control of thermal convection in water by strong gradient magnetic fields

Iwao Mogi, Chiyoki Umeki, Kohki Takahashi, Satoshi Awaji, Kazuo Watanabe, Mitsuhiro Motokawa

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23 Citations (Scopus)


Heat transfer in water was visually observed using a liquid-crystal sheet with thermochromism under strong gradient magnetic fields. Upward thermal convection was significantly suppressed by the magnetic force, however, it remained to a small extent even under magnetic levitation conditions with a gradient field of B(dB/az) = 1360 T2·m-1. A thermal conduction state without convection was realized under a stronger gradient field of B(dB/dz) = 2880 T2·m-1 at 35-40°C, and surprisingly the downward magnetic convection was observed under the same field at 40-45°C. The temperature dependence of the magnetic susceptibility of water is responsible for the convection behavior in the gradient fields.

Original languageEnglish
Pages (from-to)L715-L717
JournalJapanese Journal of Applied Physics
Issue number6 B
Publication statusPublished - 2003 Jun 15


  • Magnetic force
  • Magnetic levitation
  • Thermal convection
  • Water


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