Large-amplitude ferrofluid surface waves and jets

A non-mechanical technique for investigating fluid surface waves and jets i s presented. The method uses a ferrofluid driven by electromagnets, elimina ting complicated mechanical wave generating systems. The waves are imaged b y a fast digital camera, and associated diagnostics. Experimental results, with accompanying modelling, are presented for cylindrical standing waves, with the maximum amplitude wave being investigated. Exceeding the maximum a mplitude results in a dramatic jet, with a maximum acceleration exceeding 7 0g.