Abstract: The spinning disk reactor, which uses jet to impact the rotating wall to form a high gravity and high shear film flow, is widely used in the fields of material preparation, polymerization and so on. Considering the effects of flow rate, rotational speed and viscosity of experimental materials, the effects of different groove structures on the surface of the reactor on the characteristics and transition rules of the liquid film flow pattern were studied by using the visualization platform. The flow pattern transition phase diagram was drawn and the transition conditions of the spiral broken wave were defined. The results showed that the distribution range of spiral wave in radial grooved disks was the largest among all types of disks, and the larger the number, the larger the flow range of maintaining spiral wave. With the increase of the number of circumferential grooves, the initial formation speed of spiral broken wave decreased, while the radial grooves always maintained a low speed. With the increase of the number of grooves, the operating flow range of spiral broken wave increased significantly, especially in radial grooves. The maximum Rej value of the spiral broken wave on the radial groove disk can reach 17 486, exceeding the upper limit of 12 823 on the circumferential groove disk, and the corresponding α value was 444.5 and 815, respectively, which indicated that the flow range of the spiral broken wave on the radial groove disk was wider and the centrifugal force required for spiral wave breakage was lower. When the viscosity of the experimental medium increased, the critical transition speed of the disk structure was higher than that of the disk in the lower Rej range, and the speed required for full spreading was higher. When the experimental medium was 50wt% glycerol, the Rej value of spiral broken wave maintained on smooth disk was less than 1318, indicating that the existence range of spiral broken wave was narrower than that of other structures. In the higher Rej range, the influence of groove type and distribution on flow pattern transformation was weakened, and the effect of radial groove was better than that of circumferential groove. This study provided a theoretical and applied basis for improving the micro-mixing and reaction performance of rotary reactor by regulating the liquid film flow behavior with non-flat surface.

Key words: fluid mechanics, flow pattern, disk structure, spinning disk reactor

摘要： 转盘反应器利用射流冲击旋转壁形成超重力高剪切薄膜流，广泛应用于材料制备、聚合等领域。考虑流量、转速以及实验物料黏度影响，利用可视化平台，研究了反应器表面不同沟槽结构对液膜流型特征与转变规律的影响，绘制了流动相图，明确了螺旋破碎流型转变条件。结果表明，所有转盘结构中，径向槽盘螺旋波流型分布范围相比最大，且数量越多，维持螺旋流型的流量范围越大。周向沟槽数量增加导致螺旋破碎流型初始形成转速降低，而径向沟槽始终维持在较低转速。随着沟槽数量增加，螺旋破碎流型操作流量范围显著增加，尤其是径向沟槽。径向沟槽盘上螺旋破碎流型的Rej值最大可达17 486，超过周向槽盘的上限值12 823，且相应条件下的α值分别为444.5与815，表明径向沟槽盘上的螺旋破碎流型流量范围更广，螺旋波破碎所需要的离心力更低。实验介质黏度增大后，槽盘结构在较低Rej范围内，临界转变速度相比光盘更高，完全铺展所需转速更高。实验介质为50wt%甘油时，光盘维持螺旋破碎流型的Rej值小于1318，即螺旋破碎流型存在范围相比其他结构更窄。槽盘结构在较高Rej范围内，沟槽类型与分布对于流型转变的影响减弱，径向沟槽比周向沟槽效果更好。本研究为利用非平整表面调控转盘反应器的液膜流动行为，进而改善其微观混合与反应性能提供了可借鉴的理论与应用基础。

关键词: 流体力学, 流型, 转盘结构, 转盘反应器