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Jet breakup in superfluid and normal liquid4He
Physical Review Fluids ( IF 2.7 ) Pub Date : 
N. B. Speirs, K. R. Langley, P. Taborek, and S. T. Thoroddsen

Past studies have shown that liquid jet breakup behavior can be classified into five regimes: Rayleigh, 1st wind, sinuous, 2nd wind, and atomization. By experimentally examining the breakup of superfluid and normal liquid 4He in an atmosphere of its own vapor we investigate the evolution of the jet behavior over a large range of the traditional three dimensional parameter space of the Ohnesorge and Reynolds numbers and the gas-liquid density ratio. Using dimensional analysis we find that the transition from Rayleigh to 1st wind breakup occurs at a constant liquid Weber number, and that the transitions from 1st wind to sinuous, and sinuous to 2nd wind occur at constant gas Weber numbers. The proposed transitions, which differ from some previous studies, are well supported by our new experimental data that extend over all three dimensions of the parameter space. We do not observe any obvious effects of superfluidity on the breakup behavior. In addition we examine the breakup length and comment on the transition of a liquid jet to a gaseous jet as the temperature passes through the critical point.

中文翻译:

超流体和普通液体中的射流破裂

过去的研究表明,液体射流的破裂行为可分为五种形式:瑞利,第一风,正弦,第二风和雾化。通过实验研究超流体和正常液体4He在其自身蒸气气氛中的分解,我们研究了在大范围内的Ohnesorge和Reynolds数的传统三维参数空间以及气液密度比下射流行为的演变。使用维分析,我们发现从瑞利到第一级风的转变是在恒定的液体韦伯数下发生的,从第一级风到正弦的,从第二级风到第二级的转变是在恒定的气体韦伯数下发生的。拟议的过渡与以往的一些研究有所不同,我们的新实验数据很好地支持了这些实验数据,这些实验数据遍及了参数空间的所有三个维度。我们没有观察到超流动对分手行为的任何明显影响。另外,我们检查了破裂长度,并评论了当温度通过临界点时液体射流向气体射流的转变。
更新日期:2020-03-05
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