Controlling the electrostatic Faraday instability using superposed electric fields

We present an experimental study of the electrostatic Faraday instability at interface between a dielectric and conducting liquid. response to ac electric field, which is superposed by either second field different frequency, or dc field. An important control parameter mixing ratio, denotes relative amplitudes components driving signal. For ac/ac driving, gradual variations ratio can induce jump pattern wavelength, for ac/dc wavelength be tuned continuously adjusting ratio.