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Development of Reactors and Dialysis Devices without Damaging Fragile Emulsion

不破坏易碎乳液的反应器和透析装置的开发

基本信息

批准号：
14350410
负责人：
OHMURA Naoto
金额：
$ 9.09万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
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

项目摘要

This research aimed to develop new reactors and dialysis devices without damaging fragile materials. A low shear and laminar flow is required for the fragile materials. Hence, chaotic mixing in a laminar flow field is suitable for development of such reactors. First, this research proposed a new design method of mixing field by means of a constructive approach and to discuss applicability of this method to a two-dimensional laminar mixing field. The presented method consisted of an estimation method based on the information entropy theory and a optimization method using a genetic algorithm. A very simple rotating flow is assigned for a basic component. This method successfully searched the very near optimal configuration of the rotating flow for obtaining a well-mixing state. Next, effect of mixing on chemical reactions in circular Taylor vortex flow reactor was experimentally investigated by using a second-order reaction system. The mixing behaviors in the inside of Taylor vortex cell … More s were also observed by a flow-visualization technique. The flow-visualization experiment clearly revealed the existence of two mixing zones within a Taylor vortex cell at low Reynolds numbers. Namely, the fluid flowing near the cell boundary was axially well-mixed, while the fluid element confined to the vortex core region did not collide with cylindrical wall. This vortex, core region can be regarded as an isolated mixing region. It was found in the reaction experiment that the reaction rate was larger in laminar and singly periodic wavy Taylor vortex flow regimes having large isolated mixing region than in quasi-periodic and weakly turbulent Taylor vortex flow regimes. Mixing behaviors in a conical Taylor vortex flow reactor were investigated using flow visualization and salt-solution techniques. Three different flow modes were observed, i.e. a normal steady Taylor vortex flow, an upward motion of the Taylor vortices and helical vortex flow. In the case of the upward traveling motion, the tracer substance was transported with the traveling vortices in the main flow of cross-section and along the secondary flow streamlines at the outer-edge cell boundaries. Less

该研究旨在开发新的反应器和透析设备，而不会损坏易碎材料。脆性材料需要低剪切和层流。因此，在层流场中的混沌混合是适合于这种反应器的发展。本研究首先提出一种新的混合场设计方法，并探讨此方法对二维层流混合场的适用性。该方法由基于信息熵理论的估计方法和基于遗传算法的优化方法组成。一个非常简单的旋转流被分配给一个基本的组成部分。该方法成功地搜索到了旋转流的最佳构型，以获得良好的混合状态。其次，采用二级反应体系，研究了混合对圆形泰勒涡流反应器内化学反应的影响。Taylor涡胞内的混合行为 ...更多信息还通过流动可视化技术观察了。流动显示实验清楚地揭示了在低雷诺数下泰勒涡胞内存在两个混合区。也就是说，在单元边界附近流动的流体是轴向充分混合的，而被限制在涡核区域的流体元素不与圆柱壁碰撞。这个涡核区可以看作是一个孤立的混合区。在反应实验中发现，具有大的孤立混合区的层流和单周期波动泰勒涡流区的反应速率比准周期和弱湍流泰勒涡流区的反应速率大。采用流动显示技术和盐溶液技术研究了锥形泰勒涡流反应器中的混合行为。观察到三种不同的流动模式，即正常的稳定泰勒涡流动，泰勒涡的向上运动和螺旋涡流动。向上运动时，示踪物质在横截面主流中随运动涡运动，在外缘单元边界处沿二次流线沿着运动。少