CAJ | 학술논문

以平流泵为压力源,在不同管径的石英微管中进行流动试验,显微镜观察和拍摄水-气界面和油-水界面,在微米尺度下进行了不同流速的运动界面实验,研究了微管中非混溶两种流体运动界面的特征,以及润湿性对流体在微管中流动界面的影响.实验中观察到了润湿界面的滞后现象,即界面随流速的不同而改变的现象.实验结果表明:水在微管中流动的气液界面随着流速的不同形状发生改变,流速较小时,界面基本保持为凹液面;随着流速的增加,液面由凹液面向平液面发展,进而发展为凸液面.在表面张力的作用下,微管的尺寸越小,两种流体的性质差别越大,界面的润湿滞后现象越不明显,讨论了界面和润湿滞后存在的问题和可能的应用.
이평류빙위압력원,재불동관경적석영미관중진행류동시험,현미경관찰화박섭수-기계면화유-수계면,재미미척도하진행료불동류속적운동계면실험,연구료미관중비혼용량충류체운동계면적특정,이급윤습성대류체재미관중류동계면적영향.실험중관찰도료윤습계면적체후현상,즉계면수류속적불동이개변적현상.실험결과표명:수재미관중류동적기액계면수착류속적불동형상발생개변,류속교소시,계면기본보지위요액면;수착류속적증가,액면유요액면향평액면발전,진이발전위철액면.재표면장력적작용하,미관적척촌월소,량충류체적성질차별월대,계면적윤습체후현상월불명현,토론료계면화윤습체후존재적문제화가능적응용.
The characteristics of two liquids interface in micro channels and the influence of wettability were investigated by flow experiments in different micro channels with diameter of 75μm, 250μm and 1mm respectively, and deionized water and silicon oil were selected in this experiment. The pump was used as a pressure source, and the pictures of movable two-phase interface were observed and screened with microscopes. Some experiments were carried out at different velocity and with liquid-gas interface and water-oil interface. The phenomena of wettability hysteresis were observed. The results indicate that the styles of liquid-gas interface and water-oil interface changes with different flow velocity, which changes from concave to even until convex with the increasing velocity. The figure of interface changes more difficultly in smaller micro channels due to the surface tension. The possible prospects of two-phase interface and wettability hysteresis were discussed.