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

研究了微型反应器中化学反应的促进方法.两种不同液体界面的不稳定性(NaOH AQ.和HCl AQ.)被选为该方法的一个例子。在该体系中，中和反应发生在界面上。在化学反应中，利用图像处理技术分析了pH指示剂的颜色变化。主要结论如下：1)在间歇反应器中观察到了化学反应。采用Hele-Shaw池作为反应器。在这种情况下，在液体浓度几乎相同的情况下，盐酸的密度大于氢氧化钠的密度。当电池上层为NaOH，下层为HCl时，液体的不稳定界面由Rayleigh-Taylor不稳定性形成。在图像处理过程中，氢氧化钠的羽流产生、生长或合并，最终分裂或消失。事实表明，这些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和作为下层的NaOH同时填充到细胞中时，在液体的界面上形成了一些突起。这些投影被移动，或彼此合并，或消失。产物在NaOH-HCl体系中的密度大于在HCl体系中的密度。因此，似乎向下流动发生在产品和HCl之间的界面上，然后产生投影。2)在流动反应器中观察到化学反应。利用模拟的微型反应器。反应器的槽道高度为200~500千米。考察了浓度、流量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