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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

反应器通道内剪切和空间对两种液体放热反应层流化学反应场传热和物质传递的影响

基本信息

批准号：
14550183
负责人：
NISHIMURA Tatsuo
金额：
$ 2.5万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550183/
关键词：
Exothermic reaction Rayleigh-Taylor Instability plume diffusion channel reactor 微細機械加工

项目摘要

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

研究了微反应器中化学反应的促进方法.两种不同液体（NaOH水溶液）界面的不稳定性。和HCl水溶液）被选为方法的一个例子。在该体系中，中和反应发生在界面处。在化学反应中，使用图像处理来分析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。使用Hele-Shaw电池作为反应器。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。当氢氧化钠作为电池的上层和盐酸作为下层填充在电池中时，液体的不稳定界面由瑞利-泰勒不稳定性形成。通过图像处理，氢氧化钠烟羽的产生、增长或相互融合，最后分裂或消失。另一方面，当电池中同时填充上层HCl和下层NaOH时，在液体界面处形成一些凸起。投影被移动，或彼此合并或消失。NaOH-HCl体系中产物的密度大于HCl体系。因此，似乎在产品和HCl之间的界面处发生向下流动，然后产生突起。2)观察了流动反应器中的化学反应。利用模拟微反应器。反应器的通道高度为200 - 500 μ m。考察了浓度、流速和中和热对反应的影响