弹性棒对仿生学柔性反应器的流体混合强化

doi:10.16085/j.issn.1000-6613.2017-2596

化工进展 ›› 2019, Vol. 38 ›› Issue (02): 826-833.DOI: 10.16085/j.issn.1000-6613.2017-2596

弹性棒对仿生学柔性反应器的流体混合强化

张广达(),刘明慧,邹超,肖杰,陈晓东()

苏州大学材料与化学化工学部化工与环境工程学院，苏州市绿色化工重点实验室，江苏苏州 215123

收稿日期:2017-12-15 修回日期:2018-01-23 出版日期:2019-02-05 发布日期:2019-02-05
通讯作者: 陈晓东
作者简介:<named-content content-type="corresp-name">张广达</named-content>（1994—），男，硕士研究生，研究方向为仿生化工。E-mail：<email>20154209233@stu.suda.edu.cn</email>。|陈晓东，教授，博士生导师，研究方向为仿生化工、食品与生物化工、功能颗粒技术等。E-mail：<email>xdchen@mail.suda.edu.cn</email>。
基金资助:
国家重点研发计划政府间国际科技创新合作重点专项(2016YFE0101200);国家自然科学基金(21676172, 21406148);江苏省自然科学基金优秀青年基金(BK20170062)

Enhancement of liquid mixing in a soft-elastic reactor based on bionics with an elastic rod

Guangda ZHANG(),Minghui LIU,Chao ZOU,Jie XIAO,Xiaodong CHEN()

Suzhou Key Laboratory of Green Chemical Engineering, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu, China

Received:2017-12-15 Revised:2018-01-23 Online:2019-02-05 Published:2019-02-05
Contact: Xiaodong CHEN

摘要/Abstract

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

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

中图分类号:

TQ027.1

张广达, 刘明慧, 邹超, 肖杰, 陈晓东. 弹性棒对仿生学柔性反应器的流体混合强化[J]. 化工进展, 2019, 38(02): 826-833.

Guangda ZHANG, Minghui LIU, Chao ZOU, Jie XIAO, Xiaodong CHEN. Enhancement of liquid mixing in a soft-elastic reactor based on bionics with an elastic rod[J]. Chemical Industry and Engineering Progress, 2019, 38(02): 826-833.

图/表 9

图1 实验装置

图2 柔性反应器的变形过程和分析区域

图3 柔性反应器的侧视和上视图

图4 在挤压频率为1.17Hz时，弹性棒在不同位置时对混合行为的影响

图5 挤压频率为1.17Hz，弹性棒高度不同时柔性反应器的混合行为

图6 挤压频率为1.83Hz，弹性棒高度不同时柔性

图7 柔性反应器混合时间和强化效果随挤压频率的变化

图8 弹性棒的强化效果随最大挤压深度的变化

符号说明

a	——	弹性棒到反应器内壁的距离， cm
b	——	弹性棒直径， cm
d ₁，d ₂	——	柔性反应器外直径和内直径， cm
h	——	模拟流体的液面高度， cm
h ₁	——	柔性反应器总高度， cm
h ₂	——	柔性反应器底部实体高度， cm
M	——	混合程度， %
$N M i x e d P i x e l s$	——	分析区域中混匀像素的个数，量纲为1
$N T o t a l P i x e l s$	——	分析区域中所有像素的个数，量纲为1
S _ef	——	强化效果，量纲为1
t	——	时间， s
$t m$	——	混合时间， s
$t m 1$ ， $t m 2$	——	柔性容器内有无弹性棒时的混合时间， s
μ	——	流体黏度， mPa?s
$β i, j R$	——	混匀像素阈值，量纲为1

符号说明

a	——	弹性棒到反应器内壁的距离， cm
b	——	弹性棒直径， cm
d ₁，d ₂	——	柔性反应器外直径和内直径， cm
h	——	模拟流体的液面高度， cm
h ₁	——	柔性反应器总高度， cm
h ₂	——	柔性反应器底部实体高度， cm
M	——	混合程度， %
$N M i x e d P i x e l s$	——	分析区域中混匀像素的个数，量纲为1
$N T o t a l P i x e l s$	——	分析区域中所有像素的个数，量纲为1
S _ef	——	强化效果，量纲为1
t	——	时间， s
$t m$	——	混合时间， s
$t m 1$ ， $t m 2$	——	柔性容器内有无弹性棒时的混合时间， s
μ	——	流体黏度， mPa?s
$β i, j R$	——	混匀像素阈值，量纲为1

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弹性棒对仿生学柔性反应器的流体混合强化

Enhancement of liquid mixing in a soft-elastic reactor based on bionics with an elastic rod

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