The effects of sheet thickness on the oscillation of an air-blasted liquid sheet

In the present work, experiments have been performed to study the influence of the sheet thickness on the oscillatory movement of an air-blasted liquid sheet, based on measurements of oscillation frequencies and wavelengths. To measure the wavelengths, a novel double-beam diffraction technique has been implemented. It has been determined that the sheet oscillation frequency depends on the inverse of the square root of the sheet thickness, while the wavelength increases linearly as sheet thickness is increased. Based on these dependencies, suitable non-dimensional groups are proposed to describe the problem. Wave propagation velocities have also been calculated and discussed.