DYNAMICS OF A BIDIMENSIONAL NETWORK COUPLED WATER JETS

In the present experiment, we investigate the dynamics of a bidimensio nal network of coupled water jets impinging from below on a water/air interface. A transition is observed in the dynamics of the jets. Above a critical flow rate value, the bumps at the vertical of the jets exh ibit a monoperiodic oscillatory mode. We infer that this mode is the m aterialization of helical instabilities in the submerged laminar jets. When coupled together, the water jets exhibit monoperiodic collective modes with spatial arrangements similar to those encountered in cryst als. Diagrams of stability are constructed for the different modes and considerations of symmetry are used to explain some features of the s patial arrangements.