Wavelength selection in the crown splash
Wavelength selection in the crown splash
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DOI：
10.1063/1.3526743
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发表时间：
2010-12
影响因子：
4.6
通讯作者：
Li V. Zhang;P. Brunet;J. Eggers;R. Deegan
中科院分区：
文献类型：
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作者：
Li V. Zhang;P. Brunet;J. Eggers;R. Deegan
液滴在液体层上的冲击产生飞溅，该飞溅是由一个或多个液体片的喷射和溶解引起的，所述液体片从冲击点径向膨胀。在树冠飞溅参数范围内，二次液滴沿片材边缘以相当规则的间隔沿着出现。通过对相同的参数值进行多次实验，我们测量了在边缘上生长的小振幅扰动的频谱。我们表明，在冠飞溅制度的参数范围内，二次液滴的产生的结果从瑞利高原的边缘，其形状几乎是圆柱形的不稳定性。在我们的理论计算中，我们包括了基态的时间依赖性。剩余的图案的不规则性解释的瑞利-高原色散关系的有限宽度。替代机制，如瑞利-泰勒不稳定性，可以排除我们的研究的实验参数。
The impact of a drop onto a liquid layer produces a splash that results from the ejection and dissolution of one or more liquid sheets, which expand radially from the point of impact. In the crown splash parameter regime, secondary droplets appear at fairly regularly spaced intervals along the rim of the sheet. By performing many experiments for the same parameter values, we measure the spectrum of small-amplitude perturbations growing on the rim. We show that for a range of parameters in the crown splash regime, the generation of secondary droplets results from a Rayleigh–Plateau instability of the rim, whose shape is almost cylindrical. In our theoretical calculation, we include the time dependence of the base state. The remaining irregularity of the pattern is explained by the finite width of the Rayleigh-Plateau dispersion relation. Alternative mechanisms, such as the Rayleigh–Taylor instability, can be excluded for the experimental parameters of our study.