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ICLASS 97
Proceedings of the Seventh International Conference on Liquid Atomization and Spray Systems

ISBN Druckformat: 89-950039-2-8

Effects of the Internal Flow in a Nozzle Hole on the Breakup Processes of a Liquid Jet

Abstrakt

The purpose of this study is to clarify the breakup mechanism of a high speed liquid jet, by investigating the mutual relationship between the internal flow in the nozzle hole and the disintegration behavior of the liquid jet. In order to clarify the effects of the internal flow in the nozzle hole on the spray characteristics, experiments were performed under conditions ranging from atmospheric to high ambient pressures, by using transparent nozzles with various length-to-diameter ratios of the nozzle hole L/D and the inlet shapes of the nozzle hole. The behaviors of the internal flow in the nozzle hole and the disintegration behavior of the liquid jets were observed by the photographic technique. Moreover, the vibration accelerations associated with disturbances in the nozzle hole were measured using a piezoelectric acceleration transducer, in order to quantify the magnitude of the disturbance of the liquid flow in the nozzle hole. It was shown that the vibration acceleration level VAL was proportional to the magnitude of the disturbance in the nozzle hole. As a consequence of this study, it has been determined that the important factor in the breakup processes of the liquid jet was the disturbance of the liquid flow due to cavitation phenomena.
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