化工学报 ›› 2021, Vol. 72 ›› Issue (11): 5552-5562.DOI: 10.11949/0438-1157.20210845
丁国栋1,2,3(),陈家庆1,3(),李振林2,蔡小垒1,3
收稿日期:
2021-06-23
修回日期:
2021-08-17
出版日期:
2021-11-05
发布日期:
2021-11-12
通讯作者:
陈家庆
作者简介:
丁国栋(1991—),男,博士研究生,基金资助:
Guodong DING1,2,3(),Jiaqing CHEN1,3(),Zhenlin LI2,Xiaolei CAI1,3
Received:
2021-06-23
Revised:
2021-08-17
Online:
2021-11-05
Published:
2021-11-12
Contact:
Jiaqing CHEN
摘要:
尽管文丘里管式微气泡发生器的注气口位置会对气泡在文丘里流道内的碎化特征产生直接影响,但迄今缺乏针对性的深入研究。通过可视化实验方法,对比分析了注气口分别位于喉管处(结构1型)和进水管处(结构2型)时的气液流型、气泡破碎特征以及成泡特性。实验表明,气、液相流量对结构1型微气泡发生器内的气液流型影响显著,初始成泡区域随液相流量增加,环状流或泡状流向弹状流转变,而随气相流量增加则由泡状流或弹状流向环状流转变;结构2型微气泡发生器则在此过程中始终为泡状流,其对操作工况的适应范围大于结构1型。在相同工况下,结构1型微气泡发生器的成泡Sauter平均粒径小于结构2型,但随着液相Reynolds数的增大,二者间的成泡平均粒径差值随之减小。分析原因是由于弹状流流型下,延伸至扩张段区域的弹型泡的表面积更大,能量转化率更高,气泡界面失稳碎化的程度更显著。随着液相Reynolds数的增大,初始成泡体积减小,湍流破碎机理作用占据主导,掩盖了由于界面失稳引起的气泡破碎。结构1型微气泡发生器的成泡能耗高于结构2型,并且随液相Reynolds数的增大,两者之间的差值随之增大。综合来看,结构2型微气泡发生器能够在低能耗下实现高效成泡,面向工程应用将更具优势。
中图分类号:
丁国栋, 陈家庆, 李振林, 蔡小垒. 注气孔位置对文丘里管式微气泡发生器成泡特性的影响分析[J]. 化工学报, 2021, 72(11): 5552-5562.
Guodong DING, Jiaqing CHEN, Zhenlin LI, Xiaolei CAI. Analysis of the effect of air injection hole position on bubble formation characteristics of Venturi-type microbubble generator[J]. CIESC Journal, 2021, 72(11): 5552-5562.
结构 | 关系式 | R2 |
---|---|---|
结构1型 | 0.963 | |
结构2型 | 1 |
表1 不同文丘里管式微气泡发生器的成泡平均粒径(d32)与液相Reynolds数(Reth)间的拟合关系式
Table 1 Correlations of the Sauter mean diameter with respect to Reth under different Venturi-type microbubble generator
结构 | 关系式 | R2 |
---|---|---|
结构1型 | 0.963 | |
结构2型 | 1 |
结构 | 关系式 | R2 |
---|---|---|
结构1型 | 0.991 | |
结构2型 | 0.995 |
表2 两种文丘里管式微气泡发生器的压降(ΔP)与液相Reynolds数(Reth)间的拟合关系式
Table 2 Correlations of the pressure drop with respect to Reth under different Venturi-type microbubble generator
结构 | 关系式 | R2 |
---|---|---|
结构1型 | 0.991 | |
结构2型 | 0.995 |
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