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

这项研究旨在开发新的反应堆和透析设备，而不会损害脆弱的材料。脆弱的材料需要低剪切和层流流。因此，在层流场中的混合混合适用于此类反应器的发展。首先，这项研究提出了一种通过建设性方法进行混合场的新设计方法，并讨论了该方法对二维层流混合场的适用性。提出的方法由基于信息熵理论的估计方法和使用遗传算法的优化方法组成。为基本组件分配了非常简单的旋转流。该方法成功地搜索了旋转流的几乎最佳配置，以获得混杂状态。接下来，通过使用二阶反应系统实验研究了混合对圆形泰勒涡流反应器中化学反应的影响。泰勒涡流细胞内部的混合行为也通过流动性化技术观察到了更多。流动性实验清楚地揭示了在低雷诺数下的泰勒涡流细胞中存在两个混合区。也就是说，在细胞边界附近流动的流体被轴向混杂，而限制在涡流核心区域的流体元件不会与圆柱壁相撞。该涡流，核心区域可以视为孤立的混合区域。在反应实验中发现，在具有较大分离的混合区域的层流和单一周期性的波浪状泰勒涡流流方向上，反应速率比准周期性和弱湍流的泰勒涡流流动方案中的反应速率更大。使用流动可视化和盐分溶液技术研究了锥形泰勒涡流流动反应堆中的混合行为。观察到三种不同的流量模式，即正常稳定的泰勒涡流流，泰勒涡流的向上运动和螺旋涡流的流动。在向上的行进运动的情况下，将示踪剂物质与横截面主要流动的行进涡流一起运输，并沿外边缘边界处的二次流动线运输。较少的