侵入油水界面圆盘尾迹中的夹带体积
Volume entrained in the wake of a disc intruding into an oil-water interface
摘要：
物体通过平面界面进入流体时，会使界面变形，使得界面一侧的流体被带入另一侧，这种现象称为达尔文漂移。我们研究这种现象的实验使用的光盘，这是完全在两个不混溶的流体，即油和水的界面开始。首先，我们观察到由于两种流体之间的密度差，界面的变形受到重力的影响，并表明存在一个普遍行为的时间窗口。其次，我们通过与边界积分模拟的比较表明，即使变形是普遍的，我们的结果不能完全解释的势流解。我们将这种差异归因于在圆盘尾流中产生的起始涡流。然而，由于涡的大小和强度显示出与势流解相同的普适性，因此保持了普适性。
英文摘要：
An object moving through a plane interface into a fluid deforms the interface in such a way that fluid from one side of the interface is entrained into the other side, a phenomenon known as Darwin's drift. We investigate this phenomenon experimentally using a disc which is started exactly at the interface of two immiscible fluids, namely oil and water. First, we observe that due to the density difference between the two fluids the deformation of the interface is influenced by gravity, and show that there exits a time window of universal behavior. Secondly, we show by comparing with boundary integral simulations that, even though the deformation is universal, our results cannot be fully explained by potential flow solutions. We attribute this difference to the starting vortex, which is created in the wake of the disc. Universal behavior is preserved, however, because the size and strength of the vortex shows the same universality as the potential flow solution.
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