Capillary-gravity wave resistance in ordinary and magnetic fluids

Details Capillary-gravity wave resistance in ordinary and magnetic fluids Capillary-gravity wave resistance in ordinary and magnetic fluids

1999-09-15

arxiv.org/abs/physics/9909025v1

Europhysics Letters 53 (2001) 209-215

Physics

Fluid Dynamics

12 pages, 4 figures, 1 table, submitted to Physical Review Letters

Scientific paper

10.1209/epl/i2001-00138-7

Wave resistance is the drag force associated to the emission of waves by a moving disturbance at a fluid free surface. In the case of capillary-gravity waves it undergoes a transition from zero to a finite value as the speed of the disturbance is increased. For the first time an experiment is designed in order to obtain the wave resistance as a function of speed. The effect of viscosity is explored, and a magnetic fluid is used to extend the available range of critical speeds. The threshold values are in good agreement with the proposed theory. Contrary to the theoretical model, however, the measured wave resistance reveals a non monotonic speed dependence after the threshold.

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