Pattern Formation of Hollow Drops from Final Breakup of a Hollow Jet
Pattern Formation of Hollow Drops from Final Breakup of a Hollow Jet
复制标题
空心射流最终破裂形成空心滴的图案
DOI：
10.1299/jfst.6.823
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发表时间：
2011
影响因子：
0.8
通讯作者：
T. Minemoto
中科院分区：
文献类型：
--
作者：
Truong V. Vu;H. Takakura;J. Wells;T. Minemoto
本文对同轴喷嘴中空射流的形成和破碎进行了实验研究。中空射流由外部水射流和内部氩气射流组成。通过改变内射流与外射流的流量比，使用两种类型的喷嘴确定了三种不同的中空水射流破碎模式：（I）混合中空和简单液滴形成，（II）单芯中空液滴形成，和（III）多芯中空液滴形成。这些模式被映射在韦伯数与流量比的空间中，We-Q。模式（II）中的实验结果表明，增加流量比导致形成频率增加，中空液滴的外径略微增加，并且其壁厚减小。
An experimental investigation on the formation and breakup of a hollow jet issuing from a coaxial nozzle into ambient air has been carried out. The hollow jet consists of an outer jet of water that encloses an inner jet of argon gas. By varying the flow rate ratio of the inner jet to the outer jet, three different breakup patterns of hollow water jets are identified using two types of nozzles: (I) mixed hollow and simple drop formation, (II) single-core hollow drop formation, and (III) multi-core hollow drop formation. These patterns are mapped in a space of Weber number versus flow rate ratio, We-Q. Experimental results in pattern (II) show that increasing the flow rate ratio results in increasing the formation frequency, slightly increasing outer diameters of the hollow drops, and decreasing their wall thickness.