Abstract
An experimental study was conducted to investigate the atomization characteristics of a circular nozzle and elliptical nozzles of small diameter (0.5mm) under the high injection pressure (1MPa∼9MPa). Furthermore, numerical simulations were attempted to investigate the internal flow structure in the circular and elliptical nozzles. This study showed that the disintegration characteristics of the liquid jet of elliptical nozzles were much different from those of the circular nozzle. In the case of the circular nozzle, the surface of liquid jet was much smooth near the nozzle exit under the injection pressures of this study. But, in the case of the elliptical nozzles, surface waves on liquid jet have been generated and grown with increase of the injection pressure. As a result, surface breakup was observed with the increase of injection pressure because a rough column surface caused by growth of surface wave is disintegrated to ligament as the relative velocity between the liquid jet and ambient air increases. Furthermore, the numerical simulations informed that the internal flow structure of elliptical nozzle was quite different from that of the circular nozzle. The internal flow structure of the elliptical nozzle in hydraulic flip was reattached to the orifice wall of the minor axis unlike the flow in the circular nozzle which is detached from orifice wall. It has been concluded that the internal flow structure of the elliptical nozzle has influence on the disintegration characteristics of the liquid jet issued from the elliptical nozzle.
| Original language | English |
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| State | Published - 2012 |
| Event | 12th International Conference on Liquid Atomization and Spray Systems, ICLASS 2012 - Heidelberg, Germany Duration: 2 Sep 2012 → 6 Sep 2012 |
Conference
| Conference | 12th International Conference on Liquid Atomization and Spray Systems, ICLASS 2012 |
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| Country/Territory | Germany |
| City | Heidelberg |
| Period | 2/09/12 → 6/09/12 |