Abstract In the present work, drag increase (DI) is obtained on superhydrophobic surface. The experiments were carried out with a Taylor-Couette rotor with their surface being coated by alternate superhydrophobic and hydrophilic strips in spanwise. The results exhibit a transition Re (ReT) dividing DI into two stages. Before ReT, the DI is very inconspicuous, but after ReT, DI rises sharply and then remains significant. The mechanism is proposed and also verified by numerical simulation. Before ReT, the deformation of air layer on superhydrophobic surface is slight and thus generates inconspicuous capillary force. After ReT, the receding contact line detaches from the edge of superhydrophobic surface leading to the air layer deforms more easily resulting in significant capillary force therefore DI is significant.

中文翻译：

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交替横向超疏水带上的瞬时阻力增加

摘要 在目前的工作中，在超疏水表面上获得了阻力增加（DI）。实验是用 Taylor-Couette 转子进行的，它们的表面在展向方向上涂有交替的超疏水和亲水条。结果显示了将 DI 分为两个阶段的过渡 Re (ReT)。在ReT之前，DI非常不显眼，但在ReT之后，DI急剧上升，然后保持显着。提出并通过数值模拟验证了该机制。在 ReT 之前，超疏水表面上的空气层变形很小，从而产生不明显的毛细管力。在 ReT 之后，后退接触线从超疏水表面的边缘脱离，导致空气层更容易变形，从而产生显着的毛细管力，因此 DI 显着。