Dynamic of bubble formation in slurry system in T-junction microchannel

doi:10.11949/0438-1157.20210875

Abstract

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

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

CLC Number:

TQ 021.1

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.

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.

Figures/Tables 10

Fig.1 Schematic diagram of experimental setup

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

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

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

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)

Fig.5 Evolution of bubble neck with time

Fig.6 Evolution of bubble neck in the filling stage

Fig.7 Evolution of bubble neck in the squeezing stage

Fig.8 Evolution of bubble neck in the transition stage

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

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