T型微通道内浆料体系中气泡的生成动力学

doi:10.11949/0438-1157.20210875

摘要/Abstract

摘要：

实验研究了T型微通道内浆料体系中弹状气泡的生成动力学，重点考察了颗粒粒径的影响。气泡的生成过程可划分为四个阶段：填充阶段、挤压阶段、过渡阶段和快速夹断阶段。在填充阶段、挤压阶段和快速夹断阶段，气泡最小颈部宽度与时间呈幂律关系。在过渡阶段，气泡最小颈部宽度与时间呈线性关系。浆料体系中气泡的挤压阶段和过渡阶段随颗粒粒径的减小而缩短。连续相流量及颗粒粒径对填充阶段幂律指数无显著影响；挤压阶段和快速夹断阶段的幂律指数以及过渡阶段的线性斜率均随颗粒粒径的增大而减小，随连续相流量的增大而增大。

关键词: 微通道, 气泡生成, 动力学, 浆料, 颗粒

Abstract:

The formation dynamic of slug bubbles in slurry systems in a T-shaped microchannel was investigated experimentally. The influence of particle diameter was mainly investigated. The formation process of bubbles could be divided into four stages: filling stage, squeezing stage, transition stage and rapid pinch-off stage. In the filling stage, squeezing stage and quick pinch-off stage, the minimum width of bubble neck presents a power-law relationship with time. In the transition stage, the minimum neck width of the bubble has a linear relationship with time. The durations of squeezing and transition stages in slurry shorten with the decrease of particle diameter. The influences of the continuous phase flow rate and particle diameter on the power law index of filling stage are ignorable. However, the power law indices of squeezing and pinch-off stages and linear slope of transition stage decrease with the increase of particle diameter, while increase with the rise of continuous phase flow rate.

Key words: microchannel, bubble formation, dynamics, slurry, particle

中图分类号:

TQ 021.1

聂璇宇, 陈祯, 朱春英, 付涛涛, 高习群, 马友光. T型微通道内浆料体系中气泡的生成动力学[J]. 化工学报, 2022, 73(1): 204-212.

Xuanyu NIE, Zhen CHEN, Chunying ZHU, Taotao FU, Xiqun GAO, Youguang MA. Dynamic of bubble formation in slurry system in T-junction microchannel[J]. CIESC Journal, 2022, 73(1): 204-212.

图/表 10

图1 实验装置示意图

Fig.1 Schematic diagram of experimental setup

表1 浆料的物性参数（φ=2%）

Table 1 Physical parameters of slurries （φ=2%）

颗粒粒径d_p/μm	界面张力σ/(mN·m^-1)	密度ρ/(kg·m^-3)	稠度系数K/(mPa·sⁿ)	流动指数n
0	42.02	998.87
0.1	42.96	998.84	49.31	0.44
5	42.92	999.84	39.6	0.45
20	42.51	999.84	30.1	0.50

图2 浆料液黏度随剪切速率的变化 (φ=2%)

Fig.2 The variation of the slurry viscosity with the shear rate (φ=2%)

图3 气泡生成过程中挤压阶段颗粒流动方向示意图

Fig.3 Schematic diagram of the particle flow direction during the squeezing stage of the bubble generation process

图4 T型微通道中气泡的生成过程 (φ=2%, dp=0.1 μm, QC=100 ml·h-1, QD=180 ml·h-1)

Fig.4 Bubble formation process in T-junction microfluidics (φ=2%, dp =0.1 μm, QC=100 ml·h-1, QD=180 ml·h-1)

图5 气泡颈部随时间的演化

Fig.5 Evolution of bubble neck with time

图6 填充阶段气泡颈部的演化

Fig.6 Evolution of bubble neck in the filling stage

图7 挤压阶段气泡颈部的演化

Fig.7 Evolution of bubble neck in the squeezing stage

图8 过渡阶段气泡颈部的演化

Fig.8 Evolution of bubble neck in the transition stage

图9 快速夹断阶段气泡颈部的演化

Fig.9 Evolution of bubble neck in the pinch-off stage

参考文献 37

1	Dalvand K, Ghiasvand A, Gupta V, et al. Chemotaxis-based smart drug delivery of epirubicin using a 3D printed microfluidic chip[J]. Journal of Chromatography B, 2021, 1162: 122456.
2	赵绍磊, 王灵宇, 吴送姑. 药物多晶型的研究进展[J]. 化学工业与工程, 2018, 35(3): 12-21.
	Zhao S L, Wang L Y, Wu S G. Progress in the research of pharmaceutical polymorph[J]. Chemical Industry and Engineering, 2018, 35(3): 12-21.
3	Kurylo I, Gines G, Rondelez Y, et al. Spatiotemporal control of DNA-based chemical reaction network via electrochemical activation in microfluidics[J]. Scientific Reports, 2018, 8: 6396.
4	王彦, 王靖涛. 微流控技术制备聚酰胺微胶囊的工艺研究[J]. 化学工业与工程, 2018, 35(6): 20-25.
	Wang Y, Wang J T. Preparation of polyamide microcapsules based on microfluidics[J]. Chemical Industry and Engineering, 2018, 35(6): 20-25.
5	Hofmann G, Tofighi G, Rinke G, et al. A microfluidic device for the investigation of rapid gold nanoparticle formation in continuous turbulent flow[J]. Journal of Physics: Conference Series, 2016, 712: 012072.
6	Aghaei E, Karimzadeh R, Godini H R, et al. Improving the physicochemical properties of Y zeolite for catalytic cracking of heavy oil via sequential steam-alkali-acid treatments[J]. Microporous and Mesoporous Materials, 2020, 294: 109854.
7	Ge B Q, Hu Y D, Zhang H W, et al. Zirconium promoter effect on catalytic activity of Pd based catalysts for heterogeneous hydrogenation of nitrile butadiene rubber[J]. Applied Surface Science, 2021, 539: 148212.
8	Gao L J, Chen L, Ren J T, et al. Mesoporous Cd_xZn_1-_xS with abundant surface defects for efficient photocatalytic hydrogen production[J]. Journal of Colloid and Interface Science, 2021, 589: 25-33.
9	Liedtke A K, Scheiff F, Bornette F, et al. Liquid-solid mass transfer for microchannel suspension catalysis in gas-liquid and liquid-liquid segmented flow[J]. Industrial & Engineering Chemistry Research, 2015, 54(17): 4699-4708.
10	Yu Y E, Khodaparast S, Stone H A. Armoring confined bubbles in the flow of colloidal suspensions[J]. Soft Matter, 2017, 13(15): 2857-2865.
11	Yu Y E, Khodaparast S, Stone H A. Separation of particles by size from a suspension using the motion of a confined bubble[J]. Applied Physics Letters, 2018, 112(18): 181604.
12	Yun J X, Zhang S H, Shen S C, et al. Continuous production of solid lipid nanoparticles by liquid flow-focusing and gas displacing method in microchannels[J]. Chemical Engineering Science, 2009, 64(19): 4115-4122.
13	Ding Y, Solvas X C, deMello A. “V-junction”: a novel structure for high-speed generation of bespoke droplet flows[J]. The Analyst, 2015, 140(2): 414-421.
14	Rahimi M, Yazdanparast S, Rezai P Y. Parametric study of droplet size in an axisymmetric flow-focusing capillary device[J]. Chinese Journal of Chemical Engineering, 2020, 28(4): 1016-1022.
15	Li P, Fan M X, Sun L X, et al. Numerical simulation of bubble formation in a co-flowing liquid in microfluidic chip[J]. Microgravity Science and Technology, 2020, 32(1): 1-9.
16	Fu T T, Ma Y G, Funfschilling D, et al. Gas-liquid flow stability and bubble formation in non-Newtonian fluids in microfluidic flow-focusing devices[J]. Microfluidics and Nanofluidics, 2011, 10(5): 1135-1140.
17	张沁丹, 付涛涛, 朱春英, 等. 十字聚焦型微通道内弹状液滴在黏弹性流体中的生成与尺寸预测[J]. 化工学报, 2016, 67(2): 504-511.
	Zhang Q D, Fu T T, Zhu C Y, et al. Formation and size prediction of slug droplet in viscoelastic fluid in flow-focusing microchannel[J]. CIESC Journal, 2016, 67(2): 504-511.
18	Zhang Q D, Zhu C Y, Du W, et al. Formation dynamics of elastic droplets in a microfluidic T-junction[J]. Chemical Engineering Research and Design, 2018, 139: 188-196.
19	de Menech M, Garstecki P, Jousse F, et al. Transition from squeezing to dripping in a microfluidic T-shaped junction[J]. Journal of Fluid Mechanics, 2008, 595: 141-161.
20	Garstecki P, Fuerstman M J, Stone H A, et al. Formation of droplets and bubbles in a microfluidic T-junction-scaling and mechanism of break-up[J]. Lab on a Chip, 2006, 6(3): 437-446.
21	Dollet B, van Hoeve W, Raven J P, et al. Role of the channel geometry on the bubble pinch-off in flow-focusing devices[J]. Physical Review Letters, 2008, 100(3): 034504.
22	Fu T T, Ma Y G, Funfschilling D, et al. Bubble formation in non-Newtonian fluids in a microfluidic T-junction[J]. Chemical Engineering and Processing: Process Intensification, 2011, 50(4): 438-442.
23	Tang C, Liu M Y, Xu Y G. 3-D numerical simulations on flow and mixing behaviors in gas-liquid-solid microchannels[J]. AIChE Journal, 2013, 59(6): 1934-1951.
24	Chiarello E, Gupta A, Mistura G, et al. Droplet breakup driven by shear thinning solutions in a microfluidic T-junction[J]. Physical Review Fluids, 2017, 2(12): 123602.
25	van Steijn V, Kleijn C R, Kreutzer M T. Flows around confined bubbles and their importance in triggering pinch-off[J]. Physical Review Letters, 2009, 103(21): 214501.
26	Leshansky A M, Afkhami S, Jullien M C, et al. Obstructed breakup of slender drops in a microfluidic T junction[J]. Physical Review Letters, 2012, 108(26): 264502.
27	Hoang D A, Portela L M, Kleijn C R, et al. Dynamics of droplet breakup in a T-junction[J]. Journal of Fluid Mechanics, 2013, 717: R4.
28	Che Z Z, Nguyen N T, Wong T N. Hydrodynamically mediated breakup of droplets in microchannels[J]. Applied Physics Letters, 2011, 98(5): 054102.
29	Chen Y P, Deng Z L. Hydrodynamics of a droplet passing through a microfluidic T-junction[J]. Journal of Fluid Mechanics, 2017, 819: 401-434.
30	Mora A E M, de Lima e Silva A L F, de Lima e Silva S M M. Numerical study of the dynamics of a droplet in a T-junction microchannel using OpenFOAM[J]. Chemical Engineering Science, 2019, 196: 514-526.
31	Korczyk P M, van Steijn V, Blonski S, et al. Accounting for corner flow unifies the understanding of droplet formation in microfluidic channels[J]. Nature Communications, 2019, 10: 2528.
32	Liascukiene I, Amselem G, Gunes D Z, et al. Capture of colloidal particles by a moving microfluidic bubble[J]. Soft Matter, 2018, 14(6): 992-1000.
33	Ma D F, Liang D, Zhu C Y, et al. The breakup dynamics and mechanism of viscous droplets in Y-shaped microchannels[J]. Chemical Engineering Science, 2021, 231: 116300.
34	Sun X, Zhu C Y, Fu T T, et al. Dynamics of droplet breakup and formation of satellite droplets in a microfluidic T-junction[J]. Chemical Engineering Science, 2018, 188: 158-169.
35	Wang X D, Zhu C Y, Wu Y N, et al. Dynamics of bubble breakup with partly obstruction in a microfluidic T-junction[J]. Chemical Engineering Science, 2015, 132: 128-138.
36	Jiang X F, Zhu C Y, Li H Z. Bubble pinch-off in Newtonian and non-Newtonian fluids[J]. Chemical Engineering Science, 2017, 170: 98-104.
37	Lu Y, Fu T, Zhu C, et al. Dynamics of bubble breakup at a T junction[J]. Physical Review E, 2016, 93(2): 022802.

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