Effective magnetic permeability of a turbulent fluid with macroferroparticles

摘要

A fully developed turbulent flow is capable to mix and homogenize a suspension of heavy macroscopic particles even at a high concentration of particles. If the particles are ferromagnetic, a kind of "turbulent ferrofluid" can be obtained. In the present work, we present a direct measurements of the effective magnetic permeability in a turbulent fluid with suspended ferromagnetic particles of typical size 0.01-0.1 mm and volume fraction c up to 25%. We show that the effective permeability can be fitted by the linear law μ_(eff) = 1 + 5.3c for c ≤ 10%. For higher volume fractions the permeability exceeds this linear relation.