Y型微通道内纳米颗粒稳定气泡的完全阻塞破裂动力学

doi:10.11949/0438-1157.20210863

摘要/Abstract

摘要：

研究了Y型微通道吸附型纳米颗粒稳定气泡的完全阻塞破裂的动力学，破裂过程可划分为挤压阶段和快速夹断阶段，两阶段内无量纲气泡最小颈部宽度与时间均呈幂率关系。气泡破裂过程的颈部动力学表明颗粒的存在并不影响两阶段转变的临界颈部宽度，但吸附在气泡表面的颗粒层会减弱挤压阶段中连续相对气泡颈部的挤压作用，以及快速夹断阶段角区中连续相液体回流对气泡的挤压作用，进而阻碍气泡颈部的形变，延长了气泡的破裂过程。纳米颗粒稳定的气泡的指前因子m及幂率指数α均小于常规气泡，但其差值随着毛细管数Ca和气泡长度l₀的增大而减小，颗粒对气泡破裂过程的影响逐渐减弱。此外，纳米颗粒稳定的气泡的头部曲率略小于常规气泡，颗粒对完全阻塞破裂过程气泡头部动力学的影响可以忽略。

关键词: 微流控, 纳米颗粒, 破裂, 气泡, Y型微通道

Abstract:

The breakup dynamic of bubbles stabilized by nanoparticles for the breakup process of permanent obstruction in a microfluidic Y-junction was studied. The breakup process can be divided into squeezing stage and pinch-off stage. In these two stages, the dimensionless minimum neck widths of bubbles have different power-law relationships with time. The neck dynamics of bubble breakup process shows that the particles do not affect the critical neck width for transition between the squeezing stage and pinch-off stage. But the particle layer absorbed on the bubble surface could weaken the squeeze effect of continuous phase on the neck in the squeezing stage and the extrusion effect of liquid reflux on bubbles in the corner area in the pinch-off stage, accordingly hinders the deformation of the bubble neck and prolongs the duration of bubble breakup. The pre-exponential factor m and power-law index α of bubble stabilized by particles are lower than those of ordinary bubble, nevertheless, their deviations decrease with the increase of capillary number Ca and bubble length l₀, indicating that the influence of particles on the breakup process weakens gradually. In addition, the curvature of bubble tip stabilized particles is slightly smaller than that of ordinary bubble, indicating that the effect of particles on bubble tip dynamics of the permanent obstruction process is ignorable.

Key words: microfluidics, nanoparticles, breakup, bubbles, Y-junction

中图分类号:

TQ 021.1

费滢洁, 朱春英, 付涛涛, 高习群, 马友光. Y型微通道内纳米颗粒稳定气泡的完全阻塞破裂动力学[J]. 化工学报, 2022, 73(1): 213-221.

Yingjie FEI, Chunying ZHU, Taotao FU, Xiqun GAO, Youguang MA. Breakup dynamics of bubbles stabilized by nanoparticles with permanent obstruction in a microfluidic Y-junction[J]. CIESC Journal, 2022, 73(1): 213-221.

图/表 9

图1 微通道结构示意图

Fig.1 Schematic diagram of the microfluidic device

图2 实验装置示意图1—N2钢瓶;2—注射泵;3—质量流量控制计;4—高速摄影仪;5—显微镜;6—收集瓶;7—计算机;8—微通道

Fig.2 Schematic diagram of experimental setup

图3 气泡破裂过程相关参数的定义

Fig.3 Parameters to characterize the breakup process of the bubble

图4 Y型分岔口处气泡的破裂过程 (Qc = 2.5 ml·min-1，Qd = 0.8 ml·min-1)

Fig.4 The process of bubble breakup at the Y-junction (Qc = 2.5 ml·min-1，Qd = 0.8 ml·min-1)

图5 气泡完全阻塞破裂过程最小颈部宽度和时间的幂律关系 (Qc = 2.5 ml·min-1，Qd = 0.8 ml·min-1)

Fig.5 Power-law relationship between minimum neck width and time for bubble breakup with permanent obstruction (Qc = 2.5 ml·min-1，Qd = 0.8 ml·min-1)

图6 气泡头部曲率的演化 (Qd = 0.8 ml·min-1)■,□ Qc = 2.5 ml·min-1,完全阻塞破裂; ●,○ Qc = 3 ml·min-1,部分阻塞破裂; 空心符号为常规气泡,实心符号为纳米颗粒稳定的气泡

Fig.6 The evaluation of bubble tip curvature (Qd = 0.8 ml·min-1)■,□ Qc = 2.5 ml·min-1, breakup with permanent obstruction; ●,○ Qc = 3 ml·min-1, breakup with partial obstruction; hollow symbols for original bubbles, solid symbols for hardening bubbles

图7 最小颈部宽度与时间的幂律关系 (空心符号为常规气泡，实心符号为纳米颗粒稳定的气泡)

Fig.7 Minimum width of the neck versus the dimensionless time (hollow symbols for original bubbles, solid symbols for hardening bubbles)

图8 挤压阶段指前因子m1和幂率指数α1随Ca和l0的变化 (空心符号为常规气泡，实心符号为纳米颗粒稳定的气泡)

Fig.8 The variation of pre-exponential factor m1 and power-law exponent α1 with Ca and l0 in squeezing stage (hollow symbols for original bubbles, solid symbols for hardening bubbles)

图9 快速夹断阶段指前因子m2和幂律指数α2随Ca和l0的变化 (空心符号为常规气泡，实心符号为纳米颗粒稳定的气泡)

Fig.9 The variation of pre-exponential factor m2 and power-law exponent α2 with Ca and l0 in pinch-off stage (hollow symbols for original bubbles, solid symbols for hardening bubbles)

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