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Microfluidic technology based on microchannel two-phase flow has been widely used. The precise control of the bubble or droplet size in the channel plays a crucial role in designing the microfluidic systems. In this work, the bubble breakup behavior in Y-shaped microchannel is reconstructed based on the volume of fluid method (VOF), and the effects of bubble dimensionless size (1.2–2.7), outlet flow ratio (1–4) and main channel Reynolds number (100–600) on the bubble breakup behavior are systematically investigated. The bubble asymmetric breakup process is found to be divided into three stages: extension stage, squeeze stage, and rapid pinch-off stage. In the case of small initial bubble size or relatively high outlet flow rate, the bubble does not break, but only experiences the extension stage and the squeezing stage. Four flow patterns of bubble breakup are further revealed for the bubbles with different sizes and outlet flow ratios: tunnel-tunnel breakup, obstruction-obstruction breakup, tunnel-obstruction breakup, and non-breakup. With the increase of outlet flow ratio, the breakup process of the bubble gradually becomes asymmetrical, and the flow pattern shifts along the tunnel-tunnel breakup and the obstruction-obstruction breakup, gradually turns toward the tunnel-obstruction breakup and non-breakup. On this basis, the critical flow ratio of bubble breakup and the variation of daughter bubble volume ratio with outlet flow ratio are obtained for different Reynolds numbers and initial bubble sizes, and the corresponding criterion correlation equation is refined, which can provide theoretical guidance for accurately regulating the daughter bubble size after breakup.
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Keywords:
- outlet flow ratio /
- Y-shaped microchannel /
- bubble breakup /
- 3-dimensional numerical simulation
[1] 涂善东, 周帼彦, 于新海 2007 化工进展 26 2
Tu S T, Zhou G Y, Yu X H 2007 Chem. Ind. Eng. Prog. 26 2
[2] Teh S Y, Lin R, Hung L H, Lee A P 2008 Lab on Chip 8 198Google Scholar
[3] 王琳琳, 李国君, 田辉, 叶阳辉 2011 西安交通大学学报 45 9
Wang L L, Li G J, Tian H, Ye Y H 2011 J. Xi'an Jiaotong. Univ. 45 9
[4] 王长亮, 靳遵龙, 王永庆, 王定标 2017 化工进展 36 S1
Wang C L, Jin Z L, Wang Y Q, Wang D B 2017 Chem. Ind. Eng. Prog 36 S1
[5] 乐军, 陈光文, 袁权, 罗灵爱, Hervé L G 2006 化工学报 57 6Google Scholar
Le J, Chen G W, Yuan Q 2006 J. Chem. Ind. Eng. (China) 57 6Google Scholar
[6] 梁宏, 柴振华, 施保昌 2016 65 204701Google Scholar
Liang H, Cai Z H, Shi B C 2016 Acta Phys. Sin. 65 204701Google Scholar
[7] Wang H 2019 Langmuir 35 32
[8] Zhang J Z, Li W 2016 Int. Commun. Heat Mass Transf. 74 1Google Scholar
[9] Talimi V, Muzychka Y S, Kocabiyik S 2012 Int. J. Multiphase Flow 39 88104
[10] Seemann R, Brinkmann M, Pfohl T, Herminghaus S 2012 Rep. Prog. Phys. 75 016601Google Scholar
[11] Squires T M, Quake S R 2005 Rev. Mod. Phys. 77 977Google Scholar
[12] Stone H A, Kim S 2001 AIChE J. 47 1250Google Scholar
[13] 侯璟鑫, 钱刚, 周兴贵 2013 化工学报 64 6
Hou J X, Qian G, Zhou X G 2013 J. Chem. Ind. Eng. (China) 64 6
[14] Tan J, Du L, Xu J H, Wang K, Luo G S 2011 AIChE J. 57 2647Google Scholar
[15] 刘赵淼, 刘丽昆, 申峰 2014 机械工程学报 50 8
Liu Z M, Liu L K, Shen F 2014 Chin. J. Mech. Eng. 50 8
[16] 王维萌, 马一萍, 王澎, 陈斌 2015 工程热 36 2
Wang W M, Ma Y P, Wang P, Chen B 2015 J. Eng. Therm. 36 2
[17] Ma D F, Liang D, Zhu C Y, Fu T T, Ma Y G 2020 Chem. Eng. Sci. 10 1016
[18] Carlson A, Do-Quang M, Amberg G 2010 Int. J. Multiphase Flow 36 397Google Scholar
[19] Samie M, Salari A, Shafii M B 2013 Phys. Rev. E 87 053003Google Scholar
[20] Zheng M M, Ma Y L, Jin T M, Wang J T 2016 Microfluid Nanofluid 20 107Google Scholar
[21] 温宇, 朱春英, 付涛涛, 马友光 2016 高校化学工程学报 30 19Google Scholar
Wen Y, Zhu C Y, Fu T T, Ma Y G 2016 J. Chem. Eng. Chin. Univ. 30 19Google Scholar
[22] Calderon A J, Heo Y S, Huh D, Futai N, Takayama S, Fowlkes J B 2006 Appl. Phys. Lett. 89 299
[23] 丛振霞, 朱春英, 付涛涛, 马友光 2014 化工学报 65 93Google Scholar
Cong Z X, Zhu C Y, Fu T T, Ma Y G 2014 J. Chem. Ind. Eng. (China) 65 93Google Scholar
[24] Menetrier-Deremble L, Tabeling P 2006 Phys Rev. E 74 035303
[25] Lou Q, Li T, Yang M 2019 J. Appl. Phys. 126 034301Google Scholar
[26] Brackbill J U, Kothe D B, Zemach C 1992 J. Comput. Phys. 100 335Google Scholar
[27] Fluent, ANSYS FLUENT 17.0: User's Guide, 2016, ANSYS-Fluent Inc., Canonsburg, PA.
[28] Xu Z Y, Fu T T, Zhu C Y, Jiang S K, Wang K 2019 Electrophoresis 40 376Google Scholar
[29] Gupta R, Fletcher D F, Haynes B S 2009 Chem. Eng. Sci. 64 29
[30] Pan Z H, Weibel J A, Garimella S V 2015 Numerical Heat Transfer, Part A 67 1
[31] Wang X, Liu Z M, Pang Y 2019 Chem. Eng. Sci. 197 258Google Scholar
[32] Wang X, Zhu C, Wu Y, Fu T, Ma Y 2015 Chem. Eng. Sci. 132 128Google Scholar
[33] Jullien M C, Tsang Mui Ching M J, Cohen C, Menetrier L, Tabeling P 2009 Phys. Fluids 21 072001Google Scholar
[34] Leshansky A M, Pismen L M 2009 Phys. Fluids 21 023303Google Scholar
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表 1 水和空气的物理性质(20 ℃)
Table 1. Physical parameters of water and air (20 ℃)
流体类型 密度/(kg·m–3) 黏性系
数/(Pa·s)表面张力
系数/(N·m–1)空气 1.225 0.000018 水 998.2 0.001005 0.07275 表 2 网格无关性验证: 气泡长度对比
Table 2. Mesh-independent study: Comparison of bubble length.
算例 网格 1 网格 2 网格 3 网格 4 网格数 499890 1003170 1586530 2401453 雷诺数 100 600 100 600 100 600 100 600 气泡长度$l^* $ 2.122 2.563 2.196 2.595 2.187 2.589 2.190 2.592 |误差($l^* $)|/% 3.11 1.12 0.27 0.12 0.14 0.12 — — Re 100 200 300 400 500 600 a1 1.47 1.45 1.35 1.30 1.25 1.22 b1 5.0 ×
10–71.1 ×
10–71.0 ×
10–45.8 ×
10–34.6 ×
10–32.2 ×
10–4c1 0.42 0.57 1.15 2.08 2.25 2.65 a2 0.001 0.001 0.001 0.02 0.02 0.02 b2 9.9 ×
10–51.20 1.58 1.07 0.66 0.81 c2 0.50 0.98 1.23 2.05 2.24 2.50 a3 — 0.001 0.001 0.001 0.005 0.010 b3 — 0.47 –0.36 0.15 0.03 –0.13 c3 — 0.85 1.00 1.20 1.63 1.98 i j $V^* $= 1.7 –0.79 0.025 $V^* $= 2.2 –0.44 0.034 $V^* $= 2.7 –1.54 0.054 -
[1] 涂善东, 周帼彦, 于新海 2007 化工进展 26 2
Tu S T, Zhou G Y, Yu X H 2007 Chem. Ind. Eng. Prog. 26 2
[2] Teh S Y, Lin R, Hung L H, Lee A P 2008 Lab on Chip 8 198Google Scholar
[3] 王琳琳, 李国君, 田辉, 叶阳辉 2011 西安交通大学学报 45 9
Wang L L, Li G J, Tian H, Ye Y H 2011 J. Xi'an Jiaotong. Univ. 45 9
[4] 王长亮, 靳遵龙, 王永庆, 王定标 2017 化工进展 36 S1
Wang C L, Jin Z L, Wang Y Q, Wang D B 2017 Chem. Ind. Eng. Prog 36 S1
[5] 乐军, 陈光文, 袁权, 罗灵爱, Hervé L G 2006 化工学报 57 6Google Scholar
Le J, Chen G W, Yuan Q 2006 J. Chem. Ind. Eng. (China) 57 6Google Scholar
[6] 梁宏, 柴振华, 施保昌 2016 65 204701Google Scholar
Liang H, Cai Z H, Shi B C 2016 Acta Phys. Sin. 65 204701Google Scholar
[7] Wang H 2019 Langmuir 35 32
[8] Zhang J Z, Li W 2016 Int. Commun. Heat Mass Transf. 74 1Google Scholar
[9] Talimi V, Muzychka Y S, Kocabiyik S 2012 Int. J. Multiphase Flow 39 88104
[10] Seemann R, Brinkmann M, Pfohl T, Herminghaus S 2012 Rep. Prog. Phys. 75 016601Google Scholar
[11] Squires T M, Quake S R 2005 Rev. Mod. Phys. 77 977Google Scholar
[12] Stone H A, Kim S 2001 AIChE J. 47 1250Google Scholar
[13] 侯璟鑫, 钱刚, 周兴贵 2013 化工学报 64 6
Hou J X, Qian G, Zhou X G 2013 J. Chem. Ind. Eng. (China) 64 6
[14] Tan J, Du L, Xu J H, Wang K, Luo G S 2011 AIChE J. 57 2647Google Scholar
[15] 刘赵淼, 刘丽昆, 申峰 2014 机械工程学报 50 8
Liu Z M, Liu L K, Shen F 2014 Chin. J. Mech. Eng. 50 8
[16] 王维萌, 马一萍, 王澎, 陈斌 2015 工程热 36 2
Wang W M, Ma Y P, Wang P, Chen B 2015 J. Eng. Therm. 36 2
[17] Ma D F, Liang D, Zhu C Y, Fu T T, Ma Y G 2020 Chem. Eng. Sci. 10 1016
[18] Carlson A, Do-Quang M, Amberg G 2010 Int. J. Multiphase Flow 36 397Google Scholar
[19] Samie M, Salari A, Shafii M B 2013 Phys. Rev. E 87 053003Google Scholar
[20] Zheng M M, Ma Y L, Jin T M, Wang J T 2016 Microfluid Nanofluid 20 107Google Scholar
[21] 温宇, 朱春英, 付涛涛, 马友光 2016 高校化学工程学报 30 19Google Scholar
Wen Y, Zhu C Y, Fu T T, Ma Y G 2016 J. Chem. Eng. Chin. Univ. 30 19Google Scholar
[22] Calderon A J, Heo Y S, Huh D, Futai N, Takayama S, Fowlkes J B 2006 Appl. Phys. Lett. 89 299
[23] 丛振霞, 朱春英, 付涛涛, 马友光 2014 化工学报 65 93Google Scholar
Cong Z X, Zhu C Y, Fu T T, Ma Y G 2014 J. Chem. Ind. Eng. (China) 65 93Google Scholar
[24] Menetrier-Deremble L, Tabeling P 2006 Phys Rev. E 74 035303
[25] Lou Q, Li T, Yang M 2019 J. Appl. Phys. 126 034301Google Scholar
[26] Brackbill J U, Kothe D B, Zemach C 1992 J. Comput. Phys. 100 335Google Scholar
[27] Fluent, ANSYS FLUENT 17.0: User's Guide, 2016, ANSYS-Fluent Inc., Canonsburg, PA.
[28] Xu Z Y, Fu T T, Zhu C Y, Jiang S K, Wang K 2019 Electrophoresis 40 376Google Scholar
[29] Gupta R, Fletcher D F, Haynes B S 2009 Chem. Eng. Sci. 64 29
[30] Pan Z H, Weibel J A, Garimella S V 2015 Numerical Heat Transfer, Part A 67 1
[31] Wang X, Liu Z M, Pang Y 2019 Chem. Eng. Sci. 197 258Google Scholar
[32] Wang X, Zhu C, Wu Y, Fu T, Ma Y 2015 Chem. Eng. Sci. 132 128Google Scholar
[33] Jullien M C, Tsang Mui Ching M J, Cohen C, Menetrier L, Tabeling P 2009 Phys. Fluids 21 072001Google Scholar
[34] Leshansky A M, Pismen L M 2009 Phys. Fluids 21 023303Google Scholar
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