Shear-induced tail breakup of droplets (bubbles) flowing in a straight microfluidic channel

Wu, Yining; Fu, Taotao; Zhu, Chunying; Wang, Xiaoda; Li, Huai Z.

doi:10.1016/j.ces.2015.06.046

Cited by 15 publications

(4 citation statements)

References 18 publications

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“…Figure 4 a shows that tailing is often observed during droplet formation and along the microchannel wall, and S-MDs produced by the tail splitting are reported to be three orders of magnitude smaller than the main droplet [ 23 , 24 , 25 ]. Because tailing results from the stretching of the droplet surface, for the tail to occur, it is necessary to use liquids with low interfacial tension and ensure that forces act in opposing directions so that the tail is elongated.…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, conventional droplet division caused by shear forces generates a DD, larger than the S-MDs, from the MoD (Figure 4b) [28]. Figure 4a shows that tailing is often observed during droplet formation and along the microchannel wall, and S-MDs produced by the tail splitting are reported to be three Figure 4a shows that tailing is often observed during droplet formation and along the microchannel wall, and S-MDs produced by the tail splitting are reported to be three orders of magnitude smaller than the main droplet [23][24][25]. Because tailing results from the stretching of the droplet surface, for the tail to occur, it is necessary to use liquids with low interfacial tension and ensure that forces act in opposing directions so that the tail is elongated.…”

Section: Device Design and Fabricationmentioning

confidence: 93%

“…Malloggi et al [ 23 ] succeeded in generating 900-nm droplets using step emulsification with a nanochannel, but nanoscale devices are difficult to fabricate and have high internal resistance. Márin et al [ 24 ] and Wu et al [ 25 ] generated submicron droplets without using microfluidic devices. However, microfluidic devices facilitate a series of experiments, from separation to observation, and are therefore preferred for bio-applications.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Generation of Microdroplets Using Tail Breakup Induced with Multi-Branch Channels

et al. 2021

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In recent years, research on the application of microdroplets in the fields of biotechnology and chemistry has made remarkable progress, but the technology for the stable generation of single-micrometer-scale microdroplets has not yet been established. In this paper, we developed an efficient and stable single-micrometer-scale droplet generation device based on the fragmentation of droplet tails, called “tail thread mode”, that appears under moderate flow conditions. This method can efficiently encapsulate microbeads that mimic cells and chemical products in passively generated single-micrometer-scale microdroplets. The device has a simple 2D structure; a T-junction is used for droplet generation; and in the downstream, multi-branch channels are designed for droplet deformation into the tail. Several 1–2 µm droplets were successfully produced by the tail’s fragmentation; this continuous splitting was induced by the branch channels. We examined a wide range of experimental conditions and found the optimal flow rate condition can be reduced to one-tenth compared to the conventional tip-streaming method. A mold was fabricated by simple soft lithography, and a polydimethylsiloxane (PDMS) device was fabricated using the mold. Based on the 15 patterns of experimental conditions and the results, the key factors for the generation of microdroplets in this device were examined. In the most efficient condition, 61.1% of the total droplets generated were smaller than 2 μm.

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Section: Resultsmentioning

confidence: 99%

Section: Device Design and Fabricationmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Efficient Generation of Microdroplets Using Tail Breakup Induced with Multi-Branch Channels

et al. 2021

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“…Recent development of microfluidic devices allows the study of flow behaviors of viscoelastic fluids in micro pore unit directly 27‐31 . Researchers are able to analyze quantitatively the velocity fields of viscoelastic fluids, 32 migration of crude oil droplet, 33 and interface merging or breakup of bubble 34 . Experiments on VES solutions flowing through microfluidic analogue of porous media have presented complex flow phenomena.…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic surfactant fluids filtration in porous media: A pore‐scale study

Dai

et al. 2020

AIChE Journal

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We investigated the flow of viscoelastic surfactant (VES) solutions, an important type of fracturing fluids for unconventional hydrocarbon recovery, through a divergingconverging microfluidic channel that mimics realistic unit in porous media. Newtonian fluid and viscoelastic hydrolyzed polyacrylamide (HPAM) solution were used as control groups. We vary Deborah numbers (De) up to 61.2, and found that the flow patterns of HPAM and VES solutions become very different once De ≥ 6.12. This is attributed to different generation mechanisms of viscoelasticity, thus different responses to extensional rates at pore-throats, for HPAM and VES solutions. It results in significantly smaller pressure drop of VES solutions through the microchannel compared to HPAM solution. It interprets higher filtration loss of VES solution than HPAM in core experiments and in field observations. The set-up can be generalized as a prototype to effectively evaluate the filtration of fracturing fluids.

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The flow behaviors of nanoparticle‐stabilized bubbles in microchannel: Influence of surface hardening

Wang

et al. 2019

AIChE Journal

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This work aims at understanding the influence of nanoparticle (NP) adsorption on the bubble behaviors in three‐dimensional pore throat structures and straight microchannel. Results show that the assembly of NPs at gas‐liquid interface plays a pivotal role in determining bubble behaviors. The adsorption of NPs at bubble surface results in an increase of surface elastic modulus to 112.4 mN/m. The flow field surrounding bubble was measured by microparticle image velocimetry and demonstrates first the influences of NPs adsorption on the velocity gradient close to bubble surface. The surface of nanoparticle‐dodecyltrimethyl ammonium bromide (NP‐DTAB) complexes stabilized bubble tends to harden and behaves as solid wall in tangential directions. The degree of surface hardening increases with the improvement of NP amphipathy, which leads to an augment of the shear force acting on bubble surface. Consequently, NP‐DTAB complexes stabilized bubbles possess high flow resistance and are easier to break.

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Shear-induced tail breakup of droplets (bubbles) flowing in a straight microfluidic channel

Cited by 15 publications

References 18 publications

Efficient Generation of Microdroplets Using Tail Breakup Induced with Multi-Branch Channels

Efficient Generation of Microdroplets Using Tail Breakup Induced with Multi-Branch Channels

Viscoelastic surfactant fluids filtration in porous media: A pore‐scale study

The flow behaviors of nanoparticle‐stabilized bubbles in microchannel: Influence of surface hardening

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