非对称Y型分岔微通道内气泡破裂与分配规律.pdf

第 65 卷第 1 期化工学报
2014 年 1 月 CIESC Journal ·January93·


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)
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 %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
DOI:.0438-
中图分类号:TQ 文献标志码:A 文章编号:0438—1157(2014)01—0093—07

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)

Abstract: A high-speed camera was used to observe and record bubble breakup and distribution in bifurcating
microchannels. Nitrogen and deionized water with % 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 pared with e