Splash formation by spherical drops
Splash formation by spherical drops
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DOI：
10.1017/s0022112000002500
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发表时间：
2001-01-25
影响因子：
3.7
通讯作者：
Leng, LJ
中科院分区：
文献类型：
--
作者：
Leng, LJ
借助于35毫米鼓形照相机，对球形水滴在水面上的冲击进行了实验研究，得到了高分辨率图像，提供了关于这种现象的定性和定量数据。已经推导出达到最大腔尺寸的时间的标度律，并提供了一个很好的拟合的实验结果。已经描绘了仅聚结、高速射流的形成和气泡截留的制度之间的过渡。发现高速射流在没有气泡截留的情况下发生。这是由于毛细波收敛到腔体底部中心形成的槽迅速收缩造成的。会聚毛细管波具有类似于克拉珀波的轮廓。一个图表显示不同的制度的空腔和冲击下降行为的韦伯弗劳德数平面已建成Fr和We小于1000。
The impact of a spherical water drop onto a water surface has been studied experimentally with the aid of a 35 mm drum camera giving high-resolution images that provided qualitative and quantitative data on the phenomena. Scaling laws for the time to reach maximum cavity sizes have been derived and provide a good fit to the experimental results. Transitions between the regimes for coalescence-only, the formation of a high-speed jet and bubble entrapment have been delineated. The high-speed jet was found to occur without bubble entrapment. This was caused by the rapid retraction of the trough formed by a capillary wave converging to the centre of the cavity base. The converging capillary wave has a profile similar to a Crapper wave. A plot showing the different regimes of cavity and impact drop behaviour in the Weber-Froude number-plane has been constructed for Fr and We less than 1000.