液体ジェット崩壊時に起こる液滴振動について

抄録

Experimental investigations of oscillatory droplet deformations during liquid jet breakup are presented. Droplets are produced using a pinhole droplet generator. The droplet diameter is roughly 100μm, and the experiments are carried out using propanol-2. The droplets may be produced under atmospheric or under vacuum conditions. Oscillations occur due to initial deformations of the droplets shortly after their separation from the jet. Oscillatory motions of the fundamental mode and of higher order modes may occur during the disintegration of the liquid jet. The periodical production of the droplets leads to a periodical repetition of the oscillation processes, Therefore, the experimental method allows the observation and evaluation of each phase of the motion under quasi-steady conditions. Oscillation modes dominating the droplet deformations are determined by comparison of observed and calculated droplet shapes. Different regimes of the disintegration process are found to be dominated by different oscillation modes. It could be shown that, besides oscillations of the fundamental mode, oscillations dominated by the first higher order mode may occur due to merging of droplets of different size.