Abstract
Instability of a thin liquid sheet, which is related to industrial applications such as atomization, has been studied experimentally. Flow visualization shows that a plane liquid sheet starts fluttering downstream with a certain streamwise wave length and breaks up into droplets. For a detail investigation of the fluttering disturbance, an initial disturbance was generated by loudspeakers that are connected to spanwise slots opened on the nozzle walls. In order to quantify frequency and growth rate of the disturbance, the gradient of the liquid surface was dynamically measured by a novel laser angle detector. The measurements indicate that the amplitude of the fluttering exponentially increases in the streamwise direction and the growth rate depends on its wave number. The frequency at the maximum growth rate corresponds to the fluttering frequency observed in the unexcited flow. These results led to the conclusion that the fluttering is caused by linear instability of the flow.
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