Deformation and breakup behavior of nanoparticle-stabilized bubbles in high-viscosity systems

doi:10.11949/0438-1157.20240210

Abstract

Abstract:

A high-speed camera was used to study the morphology of nanoparticle-stabilized bubbles in the highly viscous fluid in the microchannel during the flow process and its impact on the bubble collapse at the downstream symmetrical Y-junction bifurcation. Three shapes of moving bubbles in the straight channel were observed: slug bubble, dumbbell bubble, and grenade bubble, and the bubble shape was mainly affected by the flow rate of the dispersed phase. The breakup flow pattern of the bubbles at the Y-junction is mainly breakup with partial blockage. The breakup period of bubbles adsorbing nanoparticles is larger than that of bubbles without nanoparticles, and the difference of their breakup period ΔT_b shows three different rules. ΔT_b is positive and positive correlation with Ca when Ca > 0.042. There are two cases when Ca < 0.042: ΔT_b is positive and negative correlation with Ca; ΔT_b is negative and positive correlation with Ca. In addition, the deformed bubbles show asymmetric rupture behavior at the Y-junction, and the asymmetry of their breakup is related to the degree of deformation of the bubbles. When Ca is larger than the critical capillary number Ca_Cr, the reduction rate of diameter at the tail of the bubbles accelerates, which exacerbates the deformation of the bubbles and causes more significantly asymmetric breakups of the bubbles. The results show that the Ca_Cr value of bubbles adsorbing nanoparticles is the same as that of bubbles in the particle-free system, but grenade bubbles adsorbing nanoparticles show a greater degree of deformation and more obvious breakup asymmetry.

Key words: microchannels, bubbles, nanoparticles, breakup, high viscosity fluid

摘要：

采用高速摄像机研究了微通道内高黏流体中纳米颗粒稳定的气泡在流动过程中的形态及其对下游对称Y型分岔口处气泡破裂的影响。在直通道内运动气泡呈现出弹状、哑铃状和手榴弹状3种形态，气泡的形态主要受分散相流率影响。Y型分岔口处气泡的破裂流型主要为部分阻塞破裂，吸附有纳米颗粒的气泡的破裂周期较常规气泡更大，其破裂周期之差ΔT_b随毛细管数Ca变化呈现出3种不同的规律：当Ca > 0.042时，ΔT_b为正且与Ca呈正相关；当Ca < 0.042时，存在ΔT_b为正且与Ca呈负相关和ΔT_b为负且与Ca呈正相关两种情况。此外，变形气泡在Y型分岔口处呈现非对称破裂行为，其破裂的非对称性与气泡的变形程度相关，当Ca大于临界毛细管数Ca_Cr时气泡尾部直径减小的速度加快，从而加剧气泡的变形，气泡破裂的非对称性显著增大。研究表明，吸附纳米颗粒的气泡的Ca_Cr值与无颗粒体系中气泡相同，但吸附有纳米颗粒的手榴弹状气泡的形变程度更大，破裂的非对称性也更明显。

关键词: 微通道, 气泡, 纳米颗粒, 破裂, 高黏流体

CLC Number:

TQ 021.1

He ZHAO, Yingjie FEI, Chunying ZHU, Taotao FU, Youguang MA. Deformation and breakup behavior of nanoparticle-stabilized bubbles in high-viscosity systems[J]. CIESC Journal, 2024, 75(6): 2180-2189.

赵赫, 费滢洁, 朱春英, 付涛涛, 马友光. 高黏体系中纳米颗粒稳定气泡的形变及破裂行为[J]. 化工学报, 2024, 75(6): 2180-2189.

Figures/Tables 15

Fig.1 Schematic diagram of straight microchannel

Fig.2 Schematic diagram of experimental set-up

Fig.3 Bubble Shape in the experiment

Fig.4 Flow pattern diagram of bubble shape in nanofluid (data for nanofluid system, dot-dash line is transition line from slug bubbles to dumbbell bubbles in particle-free fluid, dash line is transition line from dumbbell bubbles to grenade bubbles in particle-free fluid)

Fig.5 Schematic representation of NPs shells at the air-liquid interfaces

Fig.6 Evolution of bubble shape in straight channel

Fig.7 Effect of dispersed phase flow rate on curvatures of bubble head and tail (Qc = 1.8 ml·min-1)rhombus—particle-free fluid system; triangle—nanofluid system; solid symbols—slug bubbles; hollow symbols—dumbbell bubbles; semi-solid symbols—grenade bubbles

Fig.8 Comparison of velocities between nanoparticle-stabilized bubbles and conventional bubbles

Fig.9 Breakup process of nanoparticle-stabilized bubble at Y-junction

Fig.10 Variation of difference of breakup periods between two types of bubbles ΔTb with Ca

Fig.11 Evolution of minimum neck width with time for breakup of bubble in microfluidic Y-junction (Qc = 1.0 ml·min-1, Qd = 1.0 ml·min-1)

Fig.12 Evolution of thinning rate of minimum neck width with time for breakup of bubble in microfluidic Y-junction (Qc = 1.0 ml·min-1, Qd = 1.0 ml·min-1)

Fig.13 Comparison of neck curves of two types of bubble during sudden thinning stage of the neck (Qc = 1.0 ml·min-1, Qd = 1.0 ml·min-1)

Fig.14 Definition of relevant parameters for grenade bubble

Fig.15 Variation of deformation index and breakup asymmetry index

References 36

1	Li Y M, Wang X X, Yu S X, et al. Bubble melt electrospinning for production of polymer microfibers[J]. Polymers, 2018, 10(11): 1246.
2	Deng B W, Mao X H, Xiao W, et al. Microbubble effect-assisted electrolytic synthesis of hollow carbon spheres from CO₂ [J]. Journal of Materials Chemistry A, 2017, 5(25): 12822-12827.
3	Naira V R, Das D, Maiti S K. A novel bubble-driven internal mixer for improving productivities of algal biomass and biodiesel in a bubble-column photobioreactor under natural sunlight[J]. Renewable Energy, 2020, 157: 605-615.
4	王财林, 顾帅威, 李玉星, 等. CO₂-原油体系发泡特性实验研究[J]. 化工学报, 2019, 70(1): 251-260.
	Wang C L, Gu S W, Li Y X, et al. Experimental study on foaming characteristics of CO₂-crude oil mixture[J].CIESC Journal, 2019, 70(1): 251-260.
5	Zhang C, Liu Y Z, Jiao W Z, et al. An optimization method for enhancement of gas-liquid mass transfer in a bubble column reactor based on the entropy generation extremum principle[J]. Chinese Journal of Chemical Engineering, 2023, 53: 83-88.
6	Liu Y Y, Yao C Q, Chen G W. Gas-liquid-liquid slug flow and mass transfer in hydrophilic and hydrophobic microreactors[J]. Chinese Journal of Chemical Engineering, 2022, 50: 85-94.
7	Wang Y, Zhang L W, Du W X, et al. Controllable bubble transport on bioinspired heteromorphic magnetically steerable microcilia[J]. Advanced Functional Materials, 2023, 33(35): 2302666.
8	Li J, Guo Z G. Patterned slippery surface for bubble directional transportation and collection fabricated via a facile method[J]. Research, 2019, 2019: 9139535.
9	Farhadi H, Riahi S, Ayatollahi S, et al. Experimental study of nanoparticle-surfactant-stabilized CO₂ foam: stability and mobility control[J]. Chemical Engineering Research and Design, 2016, 111: 449-460.
10	Lü M, Ning Z, Yan K, et al. Instability and breakup of cavitation bubbles within diesel drops[J]. Chinese Journal of Chemical Engineering, 2015, 23(1): 262-267.
11	Shen F, Qiao M, Shan G C, et al. Enhancement of bubble stability in cement-based materials by a sustained-release effect of silica nanoparticles[J]. Construction and Building Materials, 2023, 362: 129739.
12	张晴, 吴颉, 马光辉. 用于超声造影成像的颗粒稳定气泡制备[J]. 过程工程学报, 2022, 22(6): 828-838.
	Zhang Q, Wu J, Ma G H. Preparation of particle stabilized bubbles for contrast ultrasound imaging[J]. Chinese Journal of Process Engineering, 2022, 22(6): 828-838.
13	Binks B P, Horozov T S. Aqueous foams stabilized solely by silica nanoparticles[J]. Angewandte Chemie International Edition, 2005, 44(24): 3722-3725.
14	Binks B P. Particles as surfactants—similarities and differences[J]. Current Opinion in Colloid & Interface Science, 2002, 7(1/2): 21-41.
15	沈秋颖, Tahir Muhammad Faran, Cumbula Armando José, 等. 对称分支并行微通道中气液两相流的均匀性规律[J].化工学报, 2018, 69(11): 4640-4647.
	Shen Q Y, Tahir M F, Cumbula A J, et al. Uniformity of gas-liquid two-phase flow in symmetrical parallelized branching microchannels[J]. CIESC Journal, 2018, 69(11): 4640-4647.
16	费滢洁, 朱春英, 付涛涛, 等. 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.
	Fei Y J, Zhu C Y, Fu T T, et al. Breakup dynamics of bubbles stabilized by nanoparticles with permanent obstruction in a microfluidic Y-junction[J].CIESC Journal, 2022, 73(1): 213-221.
17	Babamahmoudi S, Riahi S. Application of nano particle for enhancement of foam stability in the presence of crude oil: experimental investigation[J]. Journal of Molecular Liquids, 2018, 264: 499-509.
18	Yekeen N, Idris A K, Manan M A, et al. Bulk and bubble-scale experimental studies of influence of nanoparticles on foam stability[J]. Chinese Journal of Chemical Engineering, 2017, 25(3): 347-357.
19	Abdel-Fattah A I, El-Genk M S. Sorption of hydrophobic, negatively charged microspheres onto a stagnant air/water interface[J]. Journal of Colloid and Interface Science, 1998, 202(2): 417-429.
20	Vignati E, Piazza R, Lockhart T P. Pickering emulsions: interfacial tension, colloidal layer morphology, and trapped-particle motion[J]. Langmuir, 2003, 19(17): 6650-6656.
21	Glaser N, Adams D J, Böker A, et al. Janus particles at liquid-liquid interfaces[J]. Langmuir, 2006, 22(12): 5227-5229.
22	Lv Q C, Li Z M, Li B F, et al. Study of nanoparticle-surfactant-stabilized foam as a fracturing fluid[J]. Industrial & Engineering Chemistry Research, 2015, 54(38): 9468-9477.
23	Lv Q C, Li Z M, Li B F, et al. Wall slipping behavior of foam with nanoparticle-armored bubbles and its flow resistance factor in cracks[J]. Scientific Reports, 2017, 7: 5063.
24	Yao C Q, Zhao Y C, Chen G W. Multiphase processes with ionic liquids in microreactors: hydrodynamics, mass transfer and applications[J]. Chemical Engineering Science, 2018, 189: 340-359.
25	Day R F, Hinch E J, Lister J R. Self-similar capillary pinchoff of an inviscid fluid[J]. Physical Review Letters, 1998, 80(4): 704-707.
26	Lister J R, Stone H A. Capillary breakup of a viscous thread surrounded by another viscous fluid[J]. Physics of Fluids, 1998, 10(11): 2758-2764.
27	Sheng L, Chang Y, Deng J, et al. Taylor bubble generation rules in liquids with a higher viscosity in a T-junction microchannel[J]. Industrial & Engineering Chemistry Research, 2022, 61(6): 2623-2632.
28	Fei Y J, Zhu C Y, Fu T T, et al. Slug bubble deformation and its influence on bubble breakup dynamics in microchannel[J]. Chinese Journal of Chemical Engineering, 2022, 50: 66-74.
29	Yu X X, Wang R Y, Wu Y N, et al. The flow behaviors of nanoparticle-stabilized bubbles in microchannel: influence of surface hardening[J]. AIChE Journal, 2020, 66(4): e16865.
30	Fei Y J, Zhu C Y, Fu T T, et al. The breakup dynamics of bubbles stabilized by nanoparticles in a microfluidic Y-junction[J]. Chemical Engineering Science, 2021, 245: 116867.
31	Li Q, Angeli P. Experimental and numerical hydrodynamic studies of ionic liquid-aqueous plug flow in small channels[J]. Chemical Engineering Journal, 2017, 328: 717-736.
32	Fu T T, Ma Y G, Funfschilling D, et al. Dynamics of bubble breakup in a microfluidic T-junction divergence[J]. Chemical Engineering Science, 2011, 66(18): 4184-4195.
33	Jullien M C, Tsang Mui Ching M J, Cohen C, et al. Droplet breakup in microfluidic T-junctions at small capillary numbers[J]. Physics of Fluids, 2009, 21(7): 072001.
34	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.
35	Fan H, Striolo A. Nanoparticle effects on the water-oil interfacial tension[J]. Physical Review E, 2012, 86(5): 051610.
36	Taccoen N, Lequeux F, Gunes D Z, et al. Probing the mechanical strength of an armored bubble and its implication to particle-stabilized foams[J]. Physical Review X, 2016, 6(1): 011010.

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