非对称Y型分岔微通道内气泡破裂与分配规律

doi:10.3969/j.issn.0438-1157.2014.01.012

化工学报 ›› 2014, Vol. 65 ›› Issue (1): 93-99.DOI: 10.3969/j.issn.0438-1157.2014.01.012

非对称Y型分岔微通道内气泡破裂与分配规律

丛振霞, 朱春英, 付涛涛, 马友光

天津大学化工学院, 化学工程联合国家重点实验室, 天津 300072

收稿日期:2013-06-28 修回日期:2013-07-30 出版日期:2014-01-05 发布日期:2014-01-05
通讯作者: 马友光
作者简介:丛振霞（1988-），女，硕士研究生。
基金资助:
国家自然科学基金项目（21106093，21276175）；高等学校博士科学点专项科研基金项目（20110032120010）。

Bubble breakup and distribution in asymmetric Y-bifurcating microchannels

CONG Zhenxia, ZHU Chunying, FU Taotao, MA Youguang

State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Received:2013-06-28 Revised:2013-07-30 Online:2014-01-05 Published:2014-01-05
Supported by:
supported by the National Natural Science Foundation of China（21106093,21276175）and the Specialized Research Fund for the Doctoral Program of Higher Education of China (20110032120010).

摘要/Abstract

摘要： 利用高速摄像仪对气泡在非对称Y型微通道分岔口的破裂行为和分配规律进行了实验研究。采用氮气（N₂）作为分散相，含0.3%表面活性剂十二烷基硫酸钠（SDS）的蒸馏水-甘油（质量分数分别为20%、40%、50%）溶液为连续相。在分岔口处观察到了3种不同的气泡行为：无间隙的不对称破裂、有间隙的不对称破裂以及不破裂。考察了气泡破裂和不破裂行为之间的转变，并与文献进行了比较。考察了两相流率及物性对破裂气泡分配规律的影响。结果表明：破裂后两个子气泡的长度均随气相流量与气泡长度的增大而增大，随液相流量和黏度的增大而减小。随液相速度和黏度的增大，气泡破裂的不对称程度减弱。

关键词: 微通道, 气泡, 破裂, 分配, Y型分岔

Abstract: A high-speed camera was used to observe and record bubble breakup and distribution in bifurcating microchannels. Nitrogen and deionized water with 0.3% surfactant sodium dodecyl sulfate (SDS)-glycerol (20%, 40%,50%) were used as dispersed and continuous phases, respectively. Three different flow patterns were observed at the divergence: asymmetric breaking with permanent obstruction,asymmetric breaking with gap and non-breaking regimes. The transition between breakup and non-breakup was studied and compared with existing reports. The effects of flow rates of both phases and physical properties of fluids on the distributions of breaking bubbles were investigated. Both breakup lengths increased with increasing flow rate of gas phase and bubble length, and decreased with increasing liquid viscosity and flow rate. As the flow rate and viscosity of liquid phase increased, the degree of asymmetrical breakup decreased.

Key words: microchannels, bubble, breakup, distributions, Y-divergence

中图分类号:

TQ021.4

丛振霞, 朱春英, 付涛涛, 马友光. 非对称Y型分岔微通道内气泡破裂与分配规律[J]. 化工学报, 2014, 65(1): 93-99.

CONG Zhenxia, ZHU Chunying, FU Taotao, MA Youguang. Bubble breakup and distribution in asymmetric Y-bifurcating microchannels[J]. CIESC Journal, 2014, 65(1): 93-99.

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非对称Y型分岔微通道内气泡破裂与分配规律

Bubble breakup and distribution in asymmetric Y-bifurcating microchannels

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