注入润滑剂的表面的流动驱动塌陷
Flow-driven collapse of lubricant-infused surfaces
摘要：
外部液体流中的注入润滑剂的表面通常减小粘性阻力。然而，由于弯月面变形，灌注状态可能塌陷。在这里，我们讨论注入和塌陷状态的横向浅槽之间的过渡，考虑毛细管数，液体/润滑剂的粘度比和深宽比的槽作为参数诱导这种过渡。据发现，取决于凹槽的深度，发生两种不同的情况。由于弯月面从前槽边缘脱钉，可能发生润滑剂注入表面的塌陷。然而，对于非常浅的纹理，弯月面接触底壁之前，这样的脱钉可能发生。我们的解释可以帮助避免这种普遍的不利影响，在各种应用程序。
英文摘要：
Lubricant-infused surfaces in an outer liquid flow generally reduce viscous drag. However, owing to the meniscus deformation, the infused state could collapse. Here we discuss the transition between infused and collapsed states of transverse shallow grooves, considering the capillary number, liquid/lubricant viscosity ratio and aspect ratio of the groove as parameters for inducing this transition. It is found that depending on the depth of the grooves, two different scenarios occur. A collapse of lubricant-infused surfaces could happen due to a depinning of the meniscus from the front groove edge. However, for very shallow textures, the meniscus contacts the bottom wall before such a depinning could occur. Our interpretation could help avoiding this generally detrimental effect in various applications.
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