Impulsive generation of jets by flow focusing
Impulsive generation of jets by flow focusing
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DOI：
10.1017/jfm.2020.270
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发表时间：
2020-04
影响因子：
3.7
通讯作者：
J. Gordillo;H. Onuki;Y. Tagawa
中科院分区：
文献类型：
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作者：
J. Gordillo;H. Onuki;Y. Tagawa
在这里，我们的特点的起源和随后解体成液滴的类型的高速射流后形成的突然内爆的局部球形空腔。这些类型的脉冲产生的射流的完整的时空演化在这里描述利用刚刚的初始值的界面法向速度在对称轴和其相应的二阶导数沿着方位角方向，直接获得从解决方案的拉普拉斯方程进行标准的边界条件。的射流尖端的半径和速度，和喷射液滴的半径的预测时间演化，示出同意与实验观察。
Here we characterize the origin and subsequent disintegration into droplets of the type of high-speed jets formed after the sudden implosion of a locally spherical cavity. The full spatio-temporal evolution of these types of impulsively generated jets is described here making use of just the initial values of the interfacial normal velocity at the axis of symmetry and of its corresponding second derivative along the azimuthal direction, obtained straightforwardly from the solution of the Laplace equation subjected to standard boundary conditions. The predicted time evolutions of the jet tip radius and velocity, and of the radii of the ejected droplets, are shown to agree well with experimental observations.