Tuning of regimes during two-phase flow through a cross-junction

Boruah, Manash Protim; Sarker, Anik; Randive, Pitambar R.; Pati, Sukumar; Sahu, Kirti Chandra

doi:10.1063/5.0071743

Cited by 19 publications

(4 citation statements)

References 78 publications

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“…The droplet first ruptures into two satellite droplets, and the droplet neck breaks again in the process of retraction due to the Rayleigh-Plateau instability (see τ = 4.61) (Rayleigh 1878). Boruah et al (2021) also found that as the length of the fluid thread increases, the number of droplet breaking increases.…”

Section: Effect Of Capillary Numbermentioning

confidence: 88%

The dynamic behavior of a droplet flows through a constricted splitting channel: a lattice Boltzmann study

2023

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In this paper, a lattice Boltzmann method is used to simulate the dynamic behavior of a droplet flows through a constricted channel, where an obstacle is placed in the center of the constricted channel to split the droplet. The method is first used to simulate the effect of the capillary number Ca on the volume of the divided daughter droplets. Results show that the volume difference between the daughter droplets above and below the obstacle increases as Ca increases. We also find that reducing the capillary number is conducive to the droplet splitting into two daughter droplets with similar volume. The method is then used to simulate the influence of the viscosity ratio λ on the droplet flows through a constricted channel. As λ increases, the volume difference between the daughter droplets above and below the obstacle decreases. Finally, the influence of the confinement ratio Wc on the evolution of the droplet morphology is investigated. With increase in Wc, the volume difference between the daughter droplets above and below the obstacle increases. When Wc≥1, the droplet does not break up and completely enters the bottom channel. Comparing with the converging-diverging and ratchet channels, the constricted splitting channel is more conductive to the breakup of the droplet neck.

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Section: Effect Of Capillary Numbermentioning

confidence: 88%

The dynamic behavior of a droplet flows through a constricted splitting channel: a lattice Boltzmann study

2023

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“…However, accurately determining experimentally the parameters affecting droplet characteristics and providing information on the local flow field of the droplets remains challenging. 18 High-fidelity numerical simulations are expected to complement the aspects of physical phenomena that are not available from experiments. [19][20][21] Nooranidoost et al 22 numerically studied the effect of fluid viscoelasticity on droplet formation and dynamics in an axisymmetric flow-focusing structure.…”

Section: Role Of Elasticity On Polymeric Droplet Generation and Morph...mentioning

confidence: 99%

Role of elasticity on polymeric droplet generation and morphology in microfluidic cross-junctions

Duan,

Yuan,

Hao

et al. 2024

Physics of Fluids

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Recently, our direct numerical simulations [Duan et al., Phys. Fluids 36, 033112 (2024)] showed that fluid elasticity affects the extension length and pinch-off time of the droplet formation process, thus changing the flow pattern. However, the effect of fluid elasticity on the morphology and properties of polymeric droplets is not yet fully understood. In this work, by analyzing the stretched state of the polymer macromolecule and the velocity distribution of the flow process, we find that the increase in fluid elasticity (characterized by the relaxation time) inhibits the contraction of the dispersed phase during droplet pinching and resists the effect of surface tension after droplet generation, which significantly affects the droplet geometry, volume, and generation frequency. The results demonstrate that the length and volume of polymeric droplets increase with the relaxation time of the polymer fluid, while the generation frequency decreases. Meanwhile, the effects of polymer viscosity and the superficial velocity ratio of the continuous to the dispersed phase on the droplets' morphology are investigated. The semi-empirical models for the length, volume, and generation frequency of polymeric droplets are developed for the first time by considering the elastic interaction. The purpose of our work is to provide a better understanding and experimental guidance for controlling the parameters of polymeric droplets with viscoelasticity of different shapes and sizes.

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“…Droplet-based microfluidics is attracting extensive attention due to its great potential in research and medical applications. A common type of such devices are microfluidic systems that contain two immiscible fluids [125]. This system contains a main fluid flow in a microchannel known as the continuous phase and a second phase with capsules inside it, known as the dispersed phase [126][127][128].…”

Section: The Liquid-liquid Two Phased Flow In Curved Channelsmentioning

confidence: 99%

The Physics and Manipulation of Dean Vortices in Single- and Two-Phase Flow in Curved Microchannels: A Review

Saffar,

Kashanj,

Nobes

et al. 2023

Micromachines

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Microchannels with curved geometries have been employed for many applications in microfluidic devices in the past decades. The Dean vortices generated in such geometries have been manipulated using different methods to enhance the performance of devices in applications such as mixing, droplet sorting, and particle/cell separation. Understanding the effect of the manipulation method on the Dean vortices in different geometries can provide crucial information to be employed in designing high-efficiency microfluidic devices. In this review, the physics of Dean vortices and the affecting parameters are summarized. Various Dean number calculation methods are collected and represented to minimize the misinterpretation of published information due to the lack of a unified defining formula for the Dean dimensionless number. Consequently, all Dean number values reported in the references are recalculated to the most common method to facilitate comprehension of the phenomena. Based on the converted information gathered from previous numerical and experimental studies, it is concluded that the length of the channel and the channel pathline, e.g., spiral, serpentine, or helix, also affect the flow state. This review also provides a detailed summery on the effect of other geometric parameters, such as cross-section shape, aspect ratio, and radius of curvature, on the Dean vortices’ number and arrangement. Finally, considering the importance of droplet microfluidics, the effect of curved geometry on the shape, trajectory, and internal flow organization of the droplets passing through a curved channel has been reviewed.

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Tuning of regimes during two-phase flow through a cross-junction

Cited by 19 publications

References 78 publications

The dynamic behavior of a droplet flows through a constricted splitting channel: a lattice Boltzmann study

The dynamic behavior of a droplet flows through a constricted splitting channel: a lattice Boltzmann study

Role of elasticity on polymeric droplet generation and morphology in microfluidic cross-junctions

The Physics and Manipulation of Dean Vortices in Single- and Two-Phase Flow in Curved Microchannels: A Review

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