Abstract:

An elastic rod was vertically implemented on the bottom of the soft-elastic reactor. The mixing efficiency of the reactor was enhanced due to the motion of the elastic rod. The mixing process and the mixing time were investigated by a discoloration method based on a fast acid-base reaction and the image analysis method. The enhancing effect was quantitatively evaluated by the mixing time. The effects of the position of the elastic rod, the height of the elastic rod, the maximum-penetration depths and the penetration frequency were studied respectively. Results showed that after the elastic rod was introduced, the structure of the isolated region was changed and the mixing time was reduced. When the elastic rod was close to the impacting probe, the mixing enhancement was more obvious. When the height of the elastic rod was below the liquid level, the enhancing effect increased with increasing elastic rod height. When the height of the elastic rod was greater than the liquid level, the enhancing effect was not further improved with further increase of the elastic rod height. Choosing the best condition of the rod position (closest to the impacting probe) and the best condition of the height (just over the liquid level) with the maximum-penetration depth of 2.5cm, the mixing time was reduced by 57% compared with that without the elastic rod. In the experiments preformed, so far, increasing maximum-penetration depth is always beneficial to an increased efficiency.

Key words: mixing time, mixing, bionics, reactors, laminar flow

摘要：

在柔性反应器底部放置竖直的弹性硅胶棒（弹性棒），通过弹性棒运动对周围流体产生扰动，强化流体混合。基于酸碱中和脱色法和图像分析方法，研究了柔性反应器的混合过程和混合时间；通过混合时间定量评估了弹性棒的强化效果；并分别研究了弹性棒的位置和高度及柔性反应器系统的最大挤压深度和频率对流体混合行为的影响。结果表明：弹性棒的放置能够使柔性反应器内隔离区结构改变，混合时间减少。弹性棒位置靠近挤压头一侧时，对流体混合强化最明显。在弹性棒高度低于柔性反应器内液面时，弹性棒高度增加，强化效果增加。超过液面之后，继续增加弹性棒高度，强化效果没有进一步增加。当弹性棒靠近挤压头、高度超过液面且最大挤压深度为2.5cm，与没有弹性棒时相比混合时间减少了57%。在其他实验条件不变的前提下，最大挤压深度增加，强化效果增加。

关键词: 混合时间, 混合, 仿生, 反应器, 层流