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浙江大学学报(工学版)
浙江大学学报(工学版)  2020, Vol. 54 Issue (5): 1007-1013    DOI: 10.3785/j.issn.1008-973X.2020.05.019
能源与动力工程     
T型微通道内液滴形成过程及长度的实验研究
张井志1,2(),陈武铠1,周乃香3,雷丽1,梁福顺1
1. 山东大学 能源与动力工程学院，山东 济南 250061
2. 山东大学 动力工程及工程热物理博士后科研流动站，山东 济南 250061
3. 山东省城乡规划设计研究院，山东 济南 250013
Experiment study on formation and length of droplets in T-junction microchannels
Jing-zhi ZHANG1,2(),Wu-kai CHEN1,Nai-xiang ZHOU3,Li LEI1,Fu-shun LIANG1
1. School of Energy and Power Engineering, Shandong University, Jinan 250061, China
2. Power Engineering and Engineering Thermal Physics Postdoctoral Research Station, Shandong University, Jinan 250061, China
3. Shandong Urban and Rural Planning and Design Institute, Jinan 250013, China
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摘要：

利用高速摄像机研究截面为400×400 μm的正T型微通道内液-液两相流动特性，离散相（硅油）和连续相（质量分数为0.5%的十二烷基硫酸钠SDS蒸馏水）的体积流量范围分别为1~5、2~110 mL/h. 结果表明，两相流型主要为弹状流和滴状流，前者的形成机理为挤压机理，后者为剪切机理. 液滴的长度随离散相体积流量和离散相与连续相体积流量之比的增大而增大，随连续相的体积流量和毛细数的增大而降低. 液柱长度的变化规律与液滴长度相反. 液滴生成时间随离散相与连续相的体积流量的增大而逐渐降低，剪切机理生成液滴所需时间小于挤压机理. 依据实验结果，采用离散相与连续相体积流量比和连续相的毛细数，总结出无量纲液滴、液柱长度及液滴生成时间的预测关联式.
关键词： 微通道;  两相流;  液滴;  微尺度;  毛细数    
Abstract:

Flow characteristics of liquid-liquid two-phase flows in T-junction microchannels with 400×400 μm cross-section were experimentally studied using a high-speed camera. Silicon oil and distilled water with 0.5% sodium dodecyl sulfate (SDS) were used as dispersed phase and continuous phase, respectively. Volume flow rates of the disperse phase ranged from 1 to 5 mL/h, while those of the continuous phases ranged from 2 to 110 mL/h. Slug flow and droplet flow patterns were observed in the experimental work. Results show that the formation of dispersed slugs is controlled by the squeezing mechanism, while the shearing mechanism domains the liquid droplet formation process. The length of liquid droplet increases with the increase of volume flow rate of dispersed phase and the volume flow rate ratio of dispersed phase to continuous phase, and decreases with the increase of volume flow rate and capillary number of continuous phase. The change of lengths of liquid column is opposite to that of liquid droplet. The droplet generation time decreases with the increase of volume flow rates of dispersed phase and continuous phase, and the formation time for shearing mechanism is less than that of squeezing mechanism. Based on the experimental results, the volume flow rate ratio of dispersed phase to continuous phase and the capillary number of continuous phase are adopted to develop the predictive correlations of dimensionless liquid droplets, column length and droplet generation time.
Key words: microchannel    two-phase flow    droplet    microscale    capillary number
收稿日期: 2019-04-16 出版日期: 2020-05-05
CLC:  TQ 124  
基金资助: 中国博士后科学基金资助项目（2018M642655）；山东省自然科学基金资助项目（ZR2018BEE026）；山东大学基本科研业务经费资助项目（2017GN0026）
作者简介: 张井志（1989—），男，助理研究员，博士，从事微流控及多相流研究. orcid.org/0000-0001-5672-8349. E-mail： zhangjz@sdu.edu.cn
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引用本文:

张井志,陈武铠,周乃香,雷丽,梁福顺. T型微通道内液滴形成过程及长度的实验研究[J]. 浙江大学学报(工学版), 2020, 54(5): 1007-1013.

Jing-zhi ZHANG,Wu-kai CHEN,Nai-xiang ZHOU,Li LEI,Fu-shun LIANG. Experiment study on formation and length of droplets in T-junction microchannels. Journal of ZheJiang University (Engineering Science), 2020, 54(5): 1007-1013.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2020.05.019    或    http://www.zjujournals.com/eng/CN/Y2020/V54/I5/1007

图 1  微液滴实验系统及测试段示意图
图 2  微液滴实验图片处理过程
图 3  不同工况下的T型微通道内液滴形成过程
图 4  T型微通道内液-液两相流流动型图
图 5  主要因素对无量纲液滴长度的影响
图 6  主要因素对无量纲液柱长度的影响
文献 通道结构 连续相 离散相 关联式 MAD/% MADmax/% MRD/%
Xu等[20] 侧T型W=0.2 mm 水+SDS 正辛烷 ${L_{\rm{d}}}/W = 0.75{q^{1/3}}{\rm{C}}{{\rm{a}}_{\rm{c}}}^{ - 0.2}$ 22.5 55.5 ?18.7
Yao等[19] 正T型W=0.6 mm — — ${L_{\rm{d} } }/W = 1.34 + 1.623\dfrac{ { {q^{\rm{d} }_V } } }{ { {q^{\rm{c} }_V} - {q^{\rm{leak}}_V} } }$ — — —
甘油+SDS 辛烷 Case I ${ { {q}^{\rm{leak}}_{V} } }/{ { {q}_{V} }_{ {\rm{c} } } }\;=0.069\;8{\rm{C} }{ {\rm{a} }^{-0.269} }{ {q}^{0.041\;4} }$ 16.0 42.8 14.6
辛烷+ SPAN80 甘油 Case II ${ { {q}^{\rm{leak}}_{V} } }/{ { {q}_{V} }_{ {\rm{c} } } }\;=0.028\;2{\rm{C} }{ {\rm{a} }^{-0.321} }{ {q}^{0.249} }$ 13.0 41.2 7.2
魏丽娟等[22] 侧T型W=0.4 mm 水+甘油+SDS 环己烷 ${L_{\rm{d}}}/W = 0.85{\left( {{H}/{W}} \right)^{0.08}} + 1.28q{\left( {{H}/{W}} \right)^{ - 0.54}}$ 13.8 29.2 ?13.8
本研究 正T型W=0.4 mm 水+SDS 硅油 ${L_{\rm{d}}}/W = 0.522\;5{q^{0.129}}{\rm{C}}{{\rm{a}}_{\rm{c}}}^{ - 0.227}$ 6.7 17.7 5.2
水+SDS 硅油 ${L_{\rm{c}}}/W = 2.28{q^{ - 0.63}}{\rm{C}}{{\rm{a}}_{\rm{c}}}^{0.01}$ 14.5 38.2 2.1
表 1  液滴、液柱长度预测公式
图 7  实验值与新关联式预测值的对比
图 8  连续相与离散相体积流量对液滴生成时间的影响规律
图 9  实验获得的无量纲时间与关联式预测值的对比
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