Surface waves and wave resistance in magnetic fluids - Archive ouverte HAL
Article Dans Une Revue Brazilian Journal of Physics Année : 2001

Surface waves and wave resistance in magnetic fluids

Résumé

We present here the experimental determination of the dispersion relation of surface waves of a ferrofluid submitted to a steady vertical magnetic field. The results are compared to a linear theory where all the magnetic characteristics of the fluid have been taken into account. The knowledge of the dispersion equation is then used to analyse the capillary-wave resistance, that is the drag force associated to the emission of waves by a moving disturbance at a free fluid surface. It undergoes a transition from zero to a finite value as the speed of the disturbance reaches a certain critical value. The effect of viscosity is explored, and a magnetic fluid is shown to allow controlling the critical speeds. Contrary to the theoretical model, however, the measured wave resistance reveals a non monotonic speed dependence after the threshold.

Dates et versions

hal-03195280 , version 1 (10-04-2021)

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Julien Browaeys, Régine Perzynski, Jean-Claude Bacri, Mark Shliomis. Surface waves and wave resistance in magnetic fluids. Brazilian Journal of Physics, 2001, 31 (3), pp.441-445. ⟨10.1590/S0103-97332001000300016⟩. ⟨hal-03195280⟩
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