论文标题
流体动力学排水在湿表上的粘附中的作用
Role of Hydrodynamic Drainage in Adhesion to Wet Surfaces
论文作者
论文摘要
树蛙具有柔软的结构脚趾垫，并带有通道，有助于从脚趾垫和接触表面之间的区域挤出液体。该结构使他们能够在潮湿和粗糙的表面上行走。我们提出了旨在了解表面结构在流体动力排水力上的作用的初步结果。我们已经使用了表面力设备来测量有机硅油中的排水力（接近和缩回）。当两个表面之一具有带有通道的结构时，我们将两个平滑PMMA表面之间测量的排水力与一个度量进行了比较。我们已经观察到，当表面融合在一起并在将表面拉开时，通道的存在减少了流体动力学排水力。将我们的力量测量与雷诺理论进行了比较，我们讨论了弹性水动力变形在树蛙粘附中的可能作用。
Tree frogs possess soft structured toe pads with channels that help squeeze out fluid from the region between the toe pad and the contacting surfaces. This structure enables them to walk on wet and rough surfaces. We present our preliminary result aiming at understanding the role of surface structure on hydrodynamic drainage forces. We have used the surface forces apparatus to measure the drainage forces (approach and retraction) in silicone oil. We compare the drainage force measured between two smooth PMMA surfaces with the one measure when one of the two surfaces has a structure with channels. We have observed that the presence of channels reduces the hydrodynamic drainage forces when the surfaces come together and reduces the adhesion when the surfaces are pulled apart. Our force measurements were compared to Reynolds theory and we discuss the possible role of elastohydrodynamic deformation in tree frog adhesion.
