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为了进一步理解微通道内气液两相传质过程机理,利用激光全息干涉条纹与流体折射率以及折射率与流体浓度的关系,采用激光显微全息干涉测试系统对微通道入口处Taylor气泡形成过程中的液相侧浓度分布进行了测定。微通道尺寸为深100μm,宽2000μm,长4cm。气相采用CO2,液相使用无水乙醇。利用图像采集系统对干涉条纹的变化过程进行实时记录,并利用自编图像处理软件对干涉条纹图像进行处理,得到了Taylor气泡形成过程中液相侧浓度分布和近界面浓度边界层厚度。结果表明,在Taylor气泡形成过程中有较强的传质发生,液相近界面浓度和浓度边界层厚度均随着气液相流速的增大而减小。结果显示,利用激光显微全息干涉测试系统,对微观尺度通道内部的气液传质过程进行实时测定研究,可得到清晰的图像和满意的结果。
In order to further understand the mechanism of gas-liquid two-phase mass transfer in microchannels, the relationship between laser holographic interference fringes and refractive index of fluid and refractive index and fluid concentration was studied. The laser microscopic holographic interferometry system was used to analyze the formation of Taylor bubble at the inlet of microchannels The liquid-side concentration distribution was measured. The microchannel size is 100 μm deep, 2000 μm wide and 4 cm long. CO2 gas phase, anhydrous ethanol phase. The image acquisition system was used to record the change of interference fringes in real time. The interference fringe image was processed by the self-designed image processing software. The concentration distribution of the liquid side and the thickness of boundary layer near the interface were obtained. The results show that there is a strong mass transfer during the formation of Taylor bubble, and the concentration of liquid near the interface and the thickness of the boundary layer decrease with the increase of gas-liquid velocity. The results show that using the laser micro-holographic interferometry system, the gas-liquid mass transfer process in the micro-scale channel can be measured in real time, and clear images and satisfactory results can be obtained.