Static Threshold Pressure Gradient Characteristics of Liquid Influenced by Boundary Wettability

被引：24

作者：

Song Fu-Quan ^{[1
]}

Wang Jian-Dong ^{[1
]}

Liu Hai-Li ^{[1
]}

机构：

[1] Zhejiang Normal Univ, Dept Phys, Jinhua 321004, Peoples R China

来源：

CHINESE PHYSICS LETTERS | 2010年 / 27卷 / 02期

基金：

中国国家自然科学基金;

关键词：

FLOW CHARACTERISTICS; SLIP; MICROTUBES; DRIVEN; WATER;

D O I：

10.1088/0256-307X/27/2/024704

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We propose an experimental setup to measure the threshold pressure gradient (TPG) of microchannels with different wettability surfaces by the static method in microchannels with diameters from 20 mu m to 320 mu m, and compare the TPG of microchannels with adsorption of cetyl trimethyl ammonium bromide (CTAB) with that without CTAB adsorption. The results show the existence of TPG in microchannels. The TPG of microchannels increases with decreasing hydrodynamic diameter, and the relation between TPG and diameter is in agreement with the single-log normalization. The TPG of a microchannel with CTAB adsorption decreases obviously as compared with the microchannel without CTAB adsorption. The TPG of microchannels with different wettabilities of boundary surface are different, and the resistance of liquid flow can be reduced by changing the wettability of boundary surfaces.

引用

页数：4

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