Abstract
Thermomagnetic convection has been investigated for two kerosene-based magnetic fluids (EMG905
and NF4000C) with a focus on the determination of the critical Rayleigh numbers for the onset of
convective instability in a fluid layer. A comparison with published data for the ester-based APG513A-fluid and
theoretical predictions yield similar critical magnetic Rayleigh numbers for the EMG and APG-fluids around
Ram,c≈ 2500, which is near the expected value, but Ram,c=856
for the NF-fluid. As the
latter differs from the other two fluids mainly in the particle size distribution, it is assumed that the size
of the particles has an important and yet uninvestigated impact on the convective behavior of magnetic
fluids.
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