Self-comparison measurement for slippage on superhydrophobic surfaces based on the wetting transition
Self-comparison measurement for slippage on superhydrophobic surfaces based on the wetting transition
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DOI：
10.1088/0960-1317/20/11/115022
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发表时间：
2010-11
影响因子：
2.3
通讯作者：
Jian Li;M. Zhou;Xia Ye;L. Cai
中科院分区：
文献类型：
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作者：
Jian Li;M. Zhou;Xia Ye;L. Cai
提出了一种基于润湿转变的柱阵列超疏水表面滑移长度的自比较测量方法。在测量过程中，液体在超疏水表面上的润湿转变可导致滑移效应消失，从而可用于测量润湿转变前的滑移长度。根据这一特点，推导了该测量方法的滑移长度公式。然后，为了验证这种方法，70重量%的甘油溶液流在具有碳纳米管（CNT）森林的超疏水表面上的流变实验在具有板和板配置的商业流变系统上进行。结果表明，即使在能产生较小滑移长度的碳纳米管涂层表面上，实验滑移长度仍与理论滑移长度在同一尺度上。该测量方法可用于测量液体在由具有良好柔性的柱阵列组成的超疏水表面上流动的滑动长度。
This paper describes a self-comparison measuring method for the slip length of fluid flow over superhydrophobic surfaces consisting of a pillar array based on the wetting transition. The wetting transition of the liquid resting on a superhydrophobic surface in the measuring course may lead to the disappearance of the slippage effect, which can be used to measure the slip length before the wetting transition. Based on this feature, the slip length formula for this measuring method is deduced. Then, to verify this method, a rheological experiment for 70 wt% glycerin solution flow over a superhydrophobic surface with carbon nanotube (CNT) forest was carried out on a commercial rheological system with plate-and-plate configuration. Results show that even on the CNT-coated surface that can induce little slip length, the experimental slip length is still on the same scale as the theoretical one. This measuring method can be used to measure the slip length of liquid flow over the superhydrophobic surface consisting of a pillar array with good flexibility.