Effects of shear and space in a reactor channel on heat and material transfers for laminar chemical reaction field of two liquids with exothermic reaction

研究了微反应器中化学反应的促进方法。以两种不同液体（NaOH aq和HCl aq）界面的不稳定性为例。在该体系中，中和反应发生在界面处。在化学反应中，采用图像处理方法分析了pH指示剂颜色的变化。主要结论如下：(1)观察了间歇式反应器中的化学反应。Hele-Shaw细胞被用作反应器。在这种情况下，当液体的浓度几乎相同时，HCl的密度大于NaOH的密度。当NaOH（上层）和HCl（下层）同时被填充到细胞中时，液体的不稳定界面由瑞利-泰勒不稳定性形成。从图像处理来看，氢氧化钠的羽流产生、增长或相互合并，最终分裂或消失。事实表明，这种现象促进了细胞内的化学反应。另一方面，当作为细胞上层的HCl和作为细胞下层的NaOH同时被填充到细胞中时，液体的界面上会形成一些突起。这些投影要么被移动，要么相互融合，要么消失。NaOH-HCl体系的产物密度大于HCl体系。因此，似乎在产物与HCl之间的界面处发生了向下流动，然后产生了投影。2)观察了流动反应器中的化学反应。采用模拟微反应器。反应器通道高度为200 ~ 500体育馆。考察了浓度、流速和中和热对化学反应的影响

Promoting methods a chemical reaction in a micro reactor was investigated. Instability in an interface of two different liquids (NaOH aq. and HCl aq.) was selected as an example of the methods. In this system, neutralized reaction occurs at the interface. In the chemical reaction, change in colors of pH indicator was analyzed using an image processing. Main conclusions are obtained as follows1) Chemical reaction in a batch reactor was observed. The Hele-Shaw cell was utilized as the reactor. In this case, density of HCl was larger than that of NaOH when the concentrations of the liquids were almost same. When both the NaOH as an upper layer of the cell and the HCl as a lower layer were filled in the cell, the instabilized interface of the liquids was formed by Rayleigh-Taylor instabilities. From the image processing, plumes of the NaOH generated, grew or merged with each other's and finally split or vanished. The fact shows that the phenomena promote the chemical reaction in the cellOn the other hand, when both the HCl as an upper layer of the cell and the NaOH as a lower layer were filled in the cell, some projections were formed at the interface of the liquids. The projections were moved, or merged with each other's or vanished. A density of the product in NaOH-HCl system was larger than that of HCl. Therefore, it seems that down-flows occur at the interface between the product and HCl and then the projections generate. 2) Chemical reaction in a flowing reactor was observed. A simulated micro reactor was utilized. Channel height of the reactor was the range of 200 -500 gym. Effects of concentrations, flow rate and heat of neutralization on the chemical reaction were investigated