宏观煎饼反弹
The macroscopic pancake bounce
摘要：
我们证明了毫米水滴在疏水柱图案化的表面上的所谓煎饼反弹[Nat. Phys. 10，515（2014）]可以在更大的尺度上重现。在我们的实验中，一床钉子扮演的结构化表面和水球模型的水滴的作用。宏观的版本在很大程度上再现了微观实验的功能，包括韦伯数的依赖性和减少接触时间煎饼反弹。实验的可扩展性证实了煎饼弹跳的机制，并允许我们测量弹跳过程中施加在表面上的力。该实验简单而廉价，是学生项目可以进行一线研究的一个例子。
英文摘要：
We demonstrate that the so-called pancake bounce of millimetric water droplets on surfaces patterned with hydrophobic posts [Nat. Phys. 10, 515 (2014)] can be reproduced on larger scales. In our experiment, a bed of nails plays the role of the structured surface and a water balloon models the water droplet. The macroscopic version largely reproduces the features of the microscopic experiment, including the Weber number dependence and the reduced contact time for pancake bouncing. The scalability of the experiment confirms the mechanisms of pancake bouncing, and allows us to measure the force exerted on the surface during the bounce. The experiment is simple and inexpensive and is an example where front-line research is accessible to student projects.
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