Control of the natural frequency of the (2,0) mode of liquid bridges using active electrostatic fields

We demonstrate that active stiffening of a capillary bridge through the application of an appropriate Maxwell stress projection can be used to raise the frequency of bridge oscillations. The stress projection is proportional to the mode amplitude. This approach may be useful for suppressing the response of capillary systems to ambient vibrations. The amount of stiffening has a simple dependence on a dimensionless gain and it also depends on the slenderness of the bridge. Using a Plateau tank, we demonstrate a simple method for inferring the dimensionless gain.