The Range of Validity for the Kelvin Force

Details The Range of Validity for the Kelvin Force The Range of Validity for the Kelvin Force

2000-10-18

arxiv.org/abs/cond-mat/0010262v1

PRL 84, 2762, (2000)

Physics

Condensed Matter

Soft Condensed Matter

1 page

Scientific paper

10.1103/PhysRevLett.84.2762

In a recent Letter, Luo, Du and Huang reported a novel convective instability driven by a force rarely studied before -- that exerted by an external magnetic field on a strongly magnetizable liquid. The associated physics is surprisingly rich and promises many more interesting results for the future. Unfortunately, the analysis starts from a misconception and employs the Kelvin force outside its range of validity. Since few would recognize this as a mistake, and since its consequence in the given experiment is particularly direct and critical, this is a point well worth being clarified, and clearly understood.

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