Surface waves and wave resistance in magnetic fluids
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| Natura: | Artículo científico |
| Lingua: | en |
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Sociedade Brasileira de Física
2001
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| _version_ | 1876467453789208576 |
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| author | J. Browaeys |
| author_facet | J. Browaeys |
| contents | Surface waves and wave resistance in magnetic fluids J. Browaeys R. Perzynski J.-C. Bacri M. I. Shliomis Física, Astronomía y Matemáticas 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. 2001 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46413502016 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3 Vol.31 |
| format | Artículo científico |
| id | redalyc_46413502016 |
| institution | Redalyc |
| language | en |
| publishDate | 2001 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | Surface waves and wave resistance in magnetic fluids J. Browaeys Física, Astronomía y Matemáticas Surface waves and wave resistance in magnetic fluids J. Browaeys R. Perzynski J.-C. Bacri M. I. Shliomis Física, Astronomía y Matemáticas 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. 2001 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46413502016 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3 Vol.31 |
| title | Surface waves and wave resistance in magnetic fluids |
| topic | Física, Astronomía y Matemáticas |
| url | https://www.redalyc.org/articulo.oa?id=46413502016 |