Flow resistance of a liquid droplet confined between two hydrophobic surfaces
Flow resistance of a liquid droplet confined between two hydrophobic surfaces
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DOI：
10.1007/s00542-005-0510-z
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发表时间：
2005-08-01
影响因子：
2.1
通讯作者：
Suzuki, K
中科院分区：
文献类型：
--
作者：
Suzuki, K
对液滴在两个疏水表面之间的流动阻力进行了实验研究，并对影响液滴流动阻力的因素进行了分析。水滴在两个疏水表面之间被剪切，并测量了剪切阻力。实验结果表明，在低剪切速度下的剪切阻力主要是由于接触角滞后引起的不对称表面张力。粗糙疏水表面上的液滴在剪切下几乎保持对称，并表现出极低的摩擦力。在高剪切速度下的剪切阻力受粘性力的影响。此外，水滴在微图案化疏水表面上的滑动角已被测量以澄清表面形貌对流动阻力的影响。具有许多凸出平面的棱柱结构的表面倾向于表现出低滑动角。
Flow resistance of a liquid droplet confined between two hydrophobic surfaces has been investigated experimentally and factors contributing to the flow resistance have been studied. A water droplet has been sheared between two hydrophobic surfaces and shear resistance has been measured. The experimental results show that the shear resistance at low shear velocities is primarily caused by asymmetrical surface tension due to the contact angle hysteresis. A droplet on a rough hydrophobic surface remains almost symmetrical under shear and exhibits extremely low friction. The shear resistance at high shear velocities is affected by viscous force. Furthermore, sliding angles of water droplets on micropatterned hydrophobic surfaces have been measured to clarify the effects of surface topography on flow resistance. Surfaces with many prismatic structures raised out of the plane tend to exhibit low sliding angles.