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化工学报  2014 

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, PP. 93-99

Keywords: 微通道,气泡,破裂,分配,Y型分岔

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Abstract:

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。

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