Apparent slip flows in hydrophilic and hydrophobic microchannels
Apparent slip flows in hydrophilic and hydrophobic microchannels
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DOI：
10.1063/1.1605425
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发表时间：
2003-10-01
影响因子：
4.6
通讯作者：
Breuer, KS
中科院分区：
文献类型：
--
作者：
Choi, CH;Westin, KJA;Breuer, KS
对深度为1微米和2微米的亲水和疏水微通道中水流的滑移效应进行了实验研究。高精度微通道经过化学处理以增强其亲水和疏水性能。针对每种表面条件，使用高精度流量测量系统测量了在不同施加压力差下的纯水流量，并与考虑固体表面滑移速度的理论模型进行了比较。发现滑移长度随剪切速率近似呈线性变化，在剪切速率为10⁵ s⁻¹时，水在疏水表面流动的滑移长度值约为30纳米。由于当前分析对通道高度的纳米级不确定性较为敏感，亲水表面是否存在滑移仍不确定。（C）2003年美国物理学会。
The slip effects of water flow in hydrophilic and hydrophobic microchannels of 1 and 2 mum depth are examined experimentally. High-precision microchannels were treated chemically to enhance their hydrophilic and hydrophobic properties. The flow rates of pure water at various applied pressure differences for each surface condition were measured using a high-precision flow metering system and compared to a theoretical model that allows for a slip velocity at the solid surface. The slip length was found to vary approximately linearly with the shear rate with values of approximately 30 nm for the flow of water over hydrophobic surfaces at a shear rate of 10(5) s(-1). The existence of slip over the hydrophilic surface remains uncertain, due to the sensitivity of the current analysis to nanometer uncertainties in the channel height. (C) 2003 American Institute of Physics.