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arXiv 1502.02152cond-mat.softphysics.flu-dyn
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载荷和表面结构对剥离过程中粘性力的耦合影响

Coupled effects of applied load and surface structure on the viscous forces during peeling

Charles Dhong, Joelle Frechette

摘要:

树蛙能够利用其趾垫中上皮细胞的互连网络来调节其在干燥,潮湿和洪水环境下对表面的粘附。据推测,这些相互连接的排水通道减少了流体动力学排斥,以促进在完全淹没的环境(淹没条件)下的接触。使用一个定制的设备,我们调查的剥离力的表面结构和负载条件之间的相互作用。通过结合正常方法和剥离分离,我们可以将表面结构的影响与载荷条件隔离开来。我们调查三个表面:两个刚性的结构化表面,包括阵列的圆柱柱和一个平面作为控制。我们观察到三个制度,在工作中需要分离的结构化表面,取决于流体膜厚度之前拉出。这三个制度是基于流体力学和我们的实验结果同意一个简单的缩放参数,涉及到不同的制度观察到的表面特征。总的来说,我们发现,当考虑纯粘性贡献时,结构化表面的分离功总是小于或等于光滑表面的分离功。

英文摘要:

Tree frogs are able take advantage of an interconnected network of epithelial cells in their toe pads to modulate their adhesion to surfaces under dry, wet, and flooded environments. It has been hypothesized that these interconnected drainage channels reduce the hydrodynamic repulsion to facilitate contact under a completely submerged environment (flooded conditions). Using a custom-built apparatus we investigate the interplay between surface structure and loading conditions on the peeling force. By combining a normal approach and detachment by peeling we can isolate the effects of surface structure from the loading conditions. We investigate three surfaces: two rigid structured surfaces that consist of arrays of cylindrical posts and a flat surface as a control. We observe three regimes in the work required to separate the structured surface that depend on the fluid film thickness prior to pull out. These three regimes are based on hydrodynamics and our experimental results agree with a simple scaling argument that relates the surface features to the different regimes observed. Overall we find that the work of separation of a structured surface is always less than or equal to the one for a smooth surface when considering purely viscous contributions.

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