Formation and size prediction of slug droplet in viscoelastic fluid in flow-focusing microchannel

ZHANG Qindan; FU Taotao; ZHU Chunying; MA Youguang

doi:10.11949/j.issn.0438-1157.20151056

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Formation and size prediction of slug droplet in viscoelastic fluid in flow-focusing microchannel

更新时间：2025-12-10

- Formation and size prediction of slug droplet in viscoelastic fluid in flow-focusing microchannel
- CIESC Journal Issue 2, Pages: 504-511(2016)
- 作者机构：
  
  天津大学化工学院, 化学工程联合国家重点实验室, 天津化学化工协同创新中心,天津,300072
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20151056
  CLC： Q021.4
- Online First：05 February 2016，
  
  Published：05 February 2016
- 稿件说明：
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ZHANG Qindan, FU Taotao, ZHU Chunying, et al. Formation and size prediction of slug droplet in viscoelastic fluid in flow-focusing microchannel[J]. CIESC Journal, 2016, (2): 504-511.
DOI：

ZHANG Qindan, FU Taotao, ZHU Chunying, et al. Formation and size prediction of slug droplet in viscoelastic fluid in flow-focusing microchannel[J]. CIESC Journal, 2016, (2): 504-511. DOI： 10.11949/j.issn.0438-1157.20151056.

摘要

利用高速摄像仪对十字聚焦微通道内液滴在黏弹性流体中的生成过程进行了实验研究。微通道截面为600μm×600 μm 的正方形结构

采用硅油作为分散相

含0.3%表面活性剂十二烷基硫酸钠(SDS)的聚环氧乙烷(PEO)水溶液(质量分数分别为0.1%

0.3%

0.6%)为连续相。实验观察到了弹状流、滴状流和喷射流3 种流型。对弹状流型下液滴生成过程的颈部动力学进行了研究

考察了两相流率、连续相毛细数及弹性数对液滴尺寸的影响。结果表明:弹状液滴尺寸随连续相流率、毛细数及弹性数的增加而减小

随分散相流率的增加而增加

连续相弹性对液滴尺寸的影响相对较小。以油水两相流率比和连续相的毛细数及Reynolds 数为变量建立了弹状液滴尺寸的预测关联式

预测值与实验值吻合良好。

Abstract

A high-speed camera was utilized to observe the formation of the droplet in viscoelastic fluid in flow-focusing microchannel. The microchannel with a square section of 600 μm×600 μm was used in the experiment. Silicone oil and polyethylene oxide (PEO) solution (0.1%

0.3%

0.6%) with 0.3% surfactant sodium dodecyl sulfate (SDS) were used as dispersed and continuous phases

respectively. Three flow patterns were observed: slug flow

dripping flow and jetting flow. The transition lines for different flow patterns were obtained. The dynamics of breakup for slug droplets was studied. The effects of two-phase flow rates

capillary number and elasticity number of the continuous phase on the size of slug droplet were investigated experimentally. The results indicated that the size of slug droplet decreased with increasing flow rate

capillary number and elasticity number of the continuous phase

but it increased with increasing flow rate of the dispersed phase. The impact of the elasticity of the continuous phase on slug droplet size was relatively small. The correlations for predicting the size of slug droplet were proposed by taking the ratio of two-phase flow rates

and the capillary number and Reynolds number of the continuous phase into account. The prediction result agreed well with the experimental data.

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