The Drag Reduction Performances of Surfactant in Micro-channel
The characteristics of drag reduction of surfactant for deionized water in micro-channels are analyzed by experiments in which Cetyl Trimethyl Ammonium Bromide (CTAB) was used as the adsorption in this paper. The experiments show that the flow rate of water in micro-channel without CTAB agrees with the prediction of the conventional Hagen-Poisseuille equation. However, the flow rate in micro-channel increases clearly after CTAB being adsorbed. This indicates that the friction of water flow reduces 6.3% in micro-channel after CTAB being adsorbed in micro-channel with 50 micron diameter. The reason is that the adsorption of CTAB changes the wettability of micro-channel from hydrophilic to weak hydrophobic, and there is flow slippage at the interface between solid and liquid. The relation between the efficiency of drag reduction and the time of adsorption is also studied, the results suggest that: there are a maximum in the adsorption of CTAB, and there are two steps in the course of adsorption: mono-layer adsorption and double-layers adsorption. The wettability of micro-channel changes from hydrophilic to weak hydrophobic in the course of mono-layer adsorption, and the efficiency of drag reduction will be the most value for saturated mono-layer adsorption.
surfactant drag reduction hydrophilic hydrophobic micro-channel
SONG Fu-quan ZUO Jia-chuan WANG Jian-dong
College of Mathematics, Physics and Information Engineering, Zhejiang Normal University, Jinhua Zhejiang, 321004, China
国际会议
2009 International Forum on Porous Flow and Applications(第十届全国渗流力学学术会议)
武汉
英文
459-463
2009-04-26（万方平台首次上网日期，不代表论文的发表时间）