使用后退式注射器在疏水表面上的微滴沉积
Micron-scale droplet deposition on a hydrophobic surface using a retreating syringe
摘要：
对液滴在疏水表面的沉积进行了实验和数值模拟研究。同一个注射器可以产生多种液滴尺寸，这在很大程度上取决于针头缩回速度。根据接触线的运动，确定了三种状态。在区域I中，在缓慢的回缩速度下，接触线扩展并且可以实现大的液滴。在区域II中，在中等针速下，形成准圆柱形液体桥，导致大约针的尺寸的液滴。最后，在高速下（区域III），接触线缩回，观察到比注射器直径小得多的液滴。标度参数识别在每个政权的主导机制。从非线性数值模拟的结果与实验吻合良好，虽然预测的准确性是有限的动态接触角的行为不充分的模型。
英文摘要：
Droplet deposition onto a hydrophobic surface is studied experimentally and numerically. A wide range of droplet sizes can result from the same syringe, depending strongly on the needle retraction speed. Three regimes are identified according to the motion of the contact line. In Region I, at slow retraction speeds, the contact line expands and large droplets can be achieved. In Region II, at moderate needle speeds, a quasi-cylindrical liquid bridge forms resulting in drops approximately the size of the needle. Finally, at high speeds (Region III), the contact line retracts and droplets much smaller than the syringe diameter are observed. Scaling arguments are presented identifying the dominant mechanisms in each regime. Results from nonlinear numerical simulations agree well with the experiments, although the accuracy of the predictions is limited by inadequate models for the behavior of the dynamic contact angle.
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