Abstract
A planar liquid sheet jetting from a thin nozzle slot starts two-dimensional flutter in the direction normal to the sheet at a certain distance downstream from the slot. Further downstream amplitude of the flutter exceeds in the order of its wavelength and then the sheet breaks down to droplets. Recent linear stability theory suggests that viscosity of circumambient gas is one of fundamental factors of the sheet flutter. In this study, in order to control the streamwise velocity of the circumambient gas around the sheet, homogenous jets from air nozzles mounted in both sides of the water nozzle were supplied. Flow images show obvious suppression of the sheet flutter in the case where the gas velocity is equivalent to the velocity of the sheet, suggesting that the circumambient gas essentially affects growth of the flutter of the liquid sheet.
