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Experimental Realization of Stokes Modes of the Pipe by Lorentz Excitation

Abstract The complete set of the Stokes modes of the pipe was first given by Brösa and Böberg. Two of these modes for an incompressible fluid were now realized in a transparent tube and detected by a laser light cut. Their velocity fields and lifetimes were compared with the theoretical predictions, and good agreement was found. The modes were generated by Lorentz force fields of appropriate symmetry induced by an electrical current through the fluid and external magnetic fields. For higher excitation intensities effects of mode coupling could be observed