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首页> 外文会议>6th international conference on nanochannels, microchannels and minichannels 2008 >EFFECTS OF INTERFACIAL POSITION ON DRAG REDUCTION IN A SUPERHYDROPHOBIC MICROCHANNEL
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EFFECTS OF INTERFACIAL POSITION ON DRAG REDUCTION IN A SUPERHYDROPHOBIC MICROCHANNEL

机译：界面位置对超疏水微通道中药物还原的影响

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摘要

The use of superhydrophobic surfaces in confined flows is of particular interest as these surfaces have been shown to exhibit a drag reduction effect that is orders of magnitude larger than those due to molecular slip. In this paper we present experimental results of the pressure-driven flow of water in a parallel-plate mi-crochannel having a no-slip upper wall and a superhydrophobic lower wall. Pressure-drop versus flow-rate measurements characterize the apparent slip behavior of the superhydrophobic surfaces with varying pillar-to-pillar pitch spacing and pillar diameter. The superhydrophobic surface consists of a square array of cylindrical pillars that are fabricated by deep reactive ion etching on silicon and coated with a hydrophobic fluoropolymer.rnA major challenge, in correlating our experimental results with existing theoretical predictions, is uncertainty in the location of the gas/liquid interface and the associated gas/liquid/solid contact line within the pillar features comprising the superhydrophobic surface. We present experimental results, from laser-scanning confocal microscopy, that measure the location of the gas-liquid interface and associated contact line for fluid flowing through a parallel-plate microchannel. Knowledge of the contact line location is then used to correlate experimental pressure-drop versus flow-rate data with a theoretical model based on porous-rnflow theory that takes into account partial penetration of liquid into a superhydrophobic surface.
机译：在密闭流动中使用超疏水表面特别令人关注，因为这些表面已显示出减阻作用，其效果比分子滑移引起的效果大几个数量级。在本文中，我们介绍了压力驱动的水在平行板微通道中的实验结果，该通道具有上防滑壁和下疏水超壁。压降与流速的测量表征了超疏水性表面的表观滑移行为，其中柱到柱的节距和柱直径变化。超疏水性表面由圆柱状柱体的方形阵列组成，这些柱状体是通过在硅上进行深度反应离子刻蚀而制成的，并涂覆有疏水性含氟聚合物。包括超疏水表面的柱特征内的气/液界面和相关的气/液/固接触线。我们目前的实验结果来自激光扫描共聚焦显微镜，用于测量流经平行板微通道的气液界面和相关接触线的位置。然后将接触线位置的知识用于将实验压降与流速数据与基于多孔流理论的理论模型相关联，该模型考虑了液体向超疏水表面的部分渗透。

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