CFD-based simulation of the hydrodynamics of steady-state gas–liquid in ultrasonically oscillating microreactors
Source abstract
Abstract
Ultrasound-driven microbubble oscillation in a microchannel is commonly used in mixing and mass transfer, and its steady-state mechanisms are complex. This study proposes an acoustic streaming steady-state model for the oscillation between two microbubbles driven by ultrasound in a square microchannel (150 × 150 μm2). The breathing mode and shape oscillation mode of the bubble cap were experimentally analyzed at an ultrasound frequency of 97.5 kHz, and the flow patterns of liquid slugs were found to be completely opposite. A two-dimensional numerical model of the two microbubble oscillations was developed from a new perspective of steady state. The correctness of the model was verified by comparing the 2 μm diameter polystyrene tracer flow field with the simulation results. The steady-state flow field was analyzed in terms of ultrasound amplitude, shape, size, and liquid property parameters. The streaming velocity was found to be directly proportional to the square of the microbubble amplitude. When the bubble cap became more hydrophilic and sharper, the mixing effect improved. In particular, it was found that the microbubbles had the most intense disturbance to the fluid when the distance between the two microbubbles was twice the channel width.
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Research context
OpenAlex topics: Innovative Microfluidic and Catalytic Techniques Innovation · Microfluidic and Bio-sensing Technologies · 3D Printing in Biomedical Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Mechanical Engineering, Guangxi University 1 , Nanning 530004,
School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology 2 , Liuzhou 545006,
Guangxi Vocational and Technical College of Communications 3 , Nanning 530023,
School of Computer, Electronics and Information, Guangxi University 4 , Nanning 530004,
Funding
National Natural Science Foundation of China · Guangxi Key Research and Development Program Project · Science and Technology Major Project of Guangxi · Guangxi University Innovation Development Program Project · Liuzhou Science and Technology Program · Funding by Guangxi Science and Technology Major Projects
References (53)
Show source-provided references
1. Cavitation microstreaming patterns in single and multiple bubble systems10.1017/s0022112006004393 ↗
2. Efficient manipulation of microparticles in bubble streaming flows10.1063/1.3654949 ↗
3. Frequency dependence and frequency control of microbubble streaming flows10.1063/1.4790803 ↗
4. Numerical investigation on the hydrodynamics of Taylor flow in ultrasonically oscillating microreactors10.1016/j.ces.2021.116477 ↗
5. Trapping and control of bubbles in various microfluidic applications10.1039/d0lc00906g ↗
6. Oscillating bubbles: A versatile tool for lab on a chip applications10.1039/c2lc40424a ↗
7. Characteristics of gas–liquid Taylor flow with different liquid viscosities in a rectangular microchannel10.1016/j.cej.2019.05.051 ↗
8. Hydrodynamics and mass transfer of gas–liquid flow in a tree-shaped parallel microchannel with T-type bifurcations10.1016/j.cej.2019.05.124 ↗
9. Slug flow in microchannels: Numerical simulation and applications10.1016/j.jiec.2018.01.021 ↗
10. Formation characteristics of Taylor bubbles in power-law liquids flowing through a microfluidic co-flow device10.1016/j.jiec.2018.04.016 ↗
11. Transport and reaction in microscale segmented gas–liquid flow10.1039/b403982c ↗
12. Flow patterns in liquid slugs during bubble-train flow inside capillaries10.1016/s0009-2509(97)00114-0 ↗
13. Hydrodynamics and mass transfer of oscillating gas–liquid flow in ultrasonic microreactors10.1002/aic.15091 ↗
14. Sonochemistry and sonoluminescence in microfluidics10.1073/pnas.1019623108 ↗
15. Development of microreactors applied on biodiesel synthesis: From experimental investigation to numerical approaches10.1016/j.jiec.2018.09.021 ↗
16. Scaling the formation of slug bubbles in microfluidic flow-focusing devices10.1007/s10404-009-0471-0 ↗
17. Formation of droplets and bubbles in a microfluidic T-junction—Scaling and mechanism of break-up10.1039/b510841a ↗
18. A simple mechanism of bubble and slug formation in Taylor flow in microchannels10.1016/j.cherd.2008.03.013 ↗
19. μ-PIV study of the formation of segmented flow in microfluidic T-junctions10.1016/j.ces.2007.08.068 ↗
20. Gas–liquid Taylor flow in square micro-channels: New inlet geometries and interfacial area tuning10.1016/j.cej.2010.08.021 ↗
21. Numerical study on gas and liquid slugs for Taylor flow in a T-junction microchannel10.1016/j.ces.2006.08.073 ↗
22. Bubble lengths in the gas–liquid Taylor flow in microchannels10.1016/j.cherd.2009.07.007 ↗
23. Multiphase monolith reactors: Chemical reaction engineering of segmented flow in microchannels10.1016/j.ces.2005.03.022 ↗
24. Inertial and interfacial effects on pressure drop of Taylor flow in capillaries10.1002/aic.10495 ↗
25. An experimental study of air–water Taylor flow and mass transfer inside square microchannels10.1016/j.ces.2009.05.026 ↗
26. Impact of inlet design on mass transfer in gas–liquid rectangular microchannels10.1007/s10404-008-0292-6 ↗
27. Gas–liquid flow in T-junction microfluidic devices with a new perpendicular rupturing flow route10.1016/j.cej.2008.10.024 ↗
28. Predictive model for the size of bubbles and droplets created in microfluidic T-junctions10.1039/c002625e ↗
29. The effect of system pressure on gas–liquid slug flow in a microchannel10.1002/aic.14306 ↗
30. Numerical simulation of single bubble dynamics under acoustic travelling waves10.1016/j.ultsonch.2017.12.021 ↗
31. Acoustic microstreaming produced by nonspherical oscillations of a gas bubble. I. Case of modes 0 and m10.1103/physreve.100.033104 ↗
32. Gas–liquid hydrodynamics and mass transfer in microreactors under ultrasonic oscillation10.1016/j.cej.2020.125411 ↗
33. Hydrodynamics and mass transfer performance of a microreactor for enhanced gas separation processes10.1016/j.cej.2014.12.028 ↗
34. Hydrodynamics and mass transfer characteristics in gas–liquid flow through a rectangular microchannel10.1016/j.ces.2006.12.057 ↗
35. Mass transfer characteristics of gas–liquid absorption during Taylor flow in mini/microchannel reactors10.1016/j.ces.2013.06.005 ↗
36. A numerical study of microparticle acoustophoresis driven by acoustic radiation forces and streaming-induced drag forces10.1039/c2lc40612h ↗
37. Acoustofluidics 7: The acoustic radiation force on small particles10.1039/c2lc21068a ↗
38. Programmable and parallel trapping of submicron/nanoscale particles using acoustic micro-pillar array chip10.1002/admi.202101334 ↗
39. Shear stress in cells generated by ultrasound10.1016/j.pbiomolbio.2006.07.016 ↗
40. Investigation of noninertial cavitation produced by an ultrasonic horn10.1121/1.3650537 ↗
41. Surface oscillation and jetting from surface attached acoustic driven bubbles10.1016/j.ultsonch.2010.07.013 ↗
42. Onset of particle trapping and release via acoustic bubbles10.1039/c5lc01420d ↗
43. Microbubble shape oscillations excited through ultrasonic parametric driving10.1103/physreve.82.026321 ↗
44. Ultrasound-assisted gas–liquid mass transfer process in microreactors: The influence of surfactant, channel size and ultrasound frequency10.1016/j.cej.2020.126720 ↗
45. Forces acting on a small particle in an acoustical field in a thermoviscous fluid10.1103/physreve.92.043010 ↗
46. Controlled vesicle deformation and lysis by single oscillating bubbles10.1038/nature01613 ↗
47. Unveiling of the mechanisms of acoustic streaming induced by sharp edges10.1103/physreve.102.043110 ↗
48. Size-sensitive sorting of microparticles through control of flow geometry10.1063/1.3610940 ↗
49. Mixing and recirculation characteristics of gas–liquid Taylor flow in microreactors10.1016/j.cherd.2013.03.003 ↗
50. Internal circulation within the liquid slugs of a liquid–liquid slug-flow capillary microreactor10.1021/ie0490536 ↗
51. Three-dimensional phenomena in microbubble acoustic streaming10.1103/physrevapplied.3.041001 ↗
52. Gas–liquid two-phase flow in serpentine microchannel with different wall wettability10.1016/j.cjche.2016.10.006 ↗
53. Milliseconds microfluidic chaotic bubble mixer10.1007/s10404-009-0496-4 ↗