Volume 53, Number 2, January 2001
|Page(s)||209 - 215|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 December 2003|
Capillary-gravity wave resistance in ordinary and magnetic fluids
Groupe Ferrofluide associé à l'Université Denis
Diderot, Laboratoire des Milieux Désordonnés et
Hétérogènes, UMR CNRS 7603 Université Pierre et Marie Curie
case 86, 4 place Jussieu, 75231 Paris Cedex 05, France
2 Department of Mechanical Engineering, Ben-Gurion University of the Negev P.O.B. 653, Beer-Sheva 84105, Israel
Corresponding author: email@example.com
Accepted: 8 November 2000
Wave resistance is the drag force associated to the emission of waves by a moving disturbance at a free fluid surface. In the case of capillary-gravity waves it undergoes a transition from zero to a finite value as the speed of the disturbance reaches a certain critical value. For the first time an experiment is designed in order to obtain the capillary-gravity 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.
PACS: 47.35.+i – Hydrodynamic waves / 68.10.-m – Fluid surfaces and fluid-fluid interfaces / 75.50.Mm – Magnetic liquids
© EDP Sciences, 2001
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