Droplets generation under different flow rates in T‐junction microchannel with a neck

Pang, Yan; Zhou, Qiang; Wang, Xiang; Lei, Yanghao; Ren, Yanlin; Li, Mengqi; Wang, Ju; Liu, Zhaomiao

doi:10.1002/aic.16290

Cited by 29 publications

(9 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Prakash et al (2021) inspected the impression of a T-bend mixing channel at various radii. Pang et al (2020) presented a T-form microfluidic device with a neck at the junction and evaluate droplet volume under several flow rates. Quiyoom et al (2017) deciphered the free surface effect on liquidphase mixing in shallow vessels.…”

Section: Introductionmentioning

confidence: 99%

Design and Simulation of the Spiral Micromixer with Chaotic Advection

2023

JAFM

View full text Add to dashboard Cite

In recent years, the microfluidics technique has screwed up rising attention and be in progress a fascinating topic. Species mixing is a compelling part of any microfluidic system that abides by the major challenge. In this research, a relative explication of mixing quality of microchannels of two cross-sections square and circular in spiral form is presented by numerical simulation. To perform the visitation, geometric parameters like axial length of microchannels and hydraulic diameter are taken equal for both cases. Computational Fluid Dynamics codes unriddle the Continuity equation, Navier-Stokes equation, and Convection-Diffusion equation. Explication of fluid flow and mixing have been gone through with an extensive limit of Reynolds numbers 1 to 125. The results explicate that the circular section spiral microchannel affords a higher mixing quality admixed to the square section spiral microchannel. Furthermore, in the circumstance of circular section spiral micromixer, mixing index esteem has attained 92% at Re =125. For both section micromixer, the esteem of mixing index enhancement be contingent on Reynolds numbers. For both cases, pressure downfall has been computed for microchannels of similar lengths. The esteem of pressure downfall in square section spiral mixer is excess than circular section spiral mixer. The simulation outcomes exhibited that the circular section spiral micromixer is an effective design for microfluidic devices like Lab on a chip (LOC).

show abstract

Section: Introductionmentioning

confidence: 99%

Design and Simulation of the Spiral Micromixer with Chaotic Advection

2023

JAFM

View full text Add to dashboard Cite

show abstract

“…The droplet generation by microfluidics depends not only on the flow conditions and physical parameters of the liquids, but also on the channel geometry and its dimensions, which is one of the most significant differences from other generation methods conducted in the unconfined environment 6–9 . The confined channel space offers a novel method to precisely manipulate the droplet behaviors by tuning the deformations of the interface between immiscible liquids 10–13 …”

Section: Introductionmentioning

confidence: 99%

Thinning dynamics of the liquid thread at different stages in a rectangular cross junction

Wang

Pang

et al. 2022

AIChE Journal

Self Cite

View full text Add to dashboard Cite

Flow regime maps are plotted and the universal transitional boundary of squeezing regime and dripping regime is gained when both inertial force and viscous force of the dispersed phase are considered. The neck thinning process within the rectangular channel is divided into three stages according to evolutions of the neck width: twodimensional shrinking stage, transitional stage, and collapsing stage. Influences of the flow rates of two phases and the dispersed viscosity on evolutions of the neck width at different stages are explored. Different relations between the neck width and the remaining time are found for the earlier two stages. At the third stage, two physical mechanisms are separated by the dispersed viscosity as the neck width decreases according to w n /W ~τ2/3 under the inertial regime for both water and 40% glycerol, while the neck width reduces linearly as w n ~2(0.0709σ/μ d )t r under the viscous regime for 55% glycerol.

show abstract

“…Further, the dispersed phase starts experiencing the shearing by the continuous phase either through the pressure developed in the upstream region or viscous shear. It is called the squeezing or necking stage (van Steijn et al, 2009;Pang et al, 2020;Venkateshwarlu and Bharti, 2021). In the squeezing stage, the pressure developed upstream by the continuous phase accelerates the dispersed phase to push downstream.…”

Section: Introductionmentioning

confidence: 99%

Computational analysis of interface evolution and droplet pinch-off mechanism in two-phase liquid flow through T-junction microfluidic system

Venkateshwarlu,

Bharti

2022

Preprint

View full text Add to dashboard Cite

This work has explored interface evolution and pinch-off mechanism of the droplet formation in two-phase flow through cross-flow microfluidic device. The two-dimensional mathematical model equations have been solved using the finite element method under the squeezing regime (Ca c < 10 −2 ) for wide range of flow rates (0.1 ≤ Q r ≤ 10) and fixed contact angle (θ = 135 o ). The droplet formation process has been classified into various instantaneous stages as initial, filling, squeezing, pinch-off and stable droplet through microscopic visualization of interface evolution in phase profiles. The dynamics of interface, and point pressure in both phases is further gained and discussed. Maximum pressure in the continuous phase varied linearly with Q r . The droplet pinch-off mechanism has been thoroughly elucidated by determining the local radius of the curvature (R c,min ) and neck width (2r) during the squeezing and pinch-off stages. At the pinch-off point, both R c,min and 2r are non-linearly related to Q r . Further, the topological dynamics of interface has been explored by analyzing the Laplace pressure (p L ), acting on the interface curvature, evaluated using (a) pressure sensors in both phases, p L = p dp − p cp , (b) local radius of curvature p L = σ (1/R f + 1/R r ), and (c) minimum radius of curvature, p L = σ 1/R c,min . The insights obtained from the present work can reliably be used in designing the model and prototypes of

show abstract

Droplets generation under different flow rates in T‐junction microchannel with a neck

Cited by 29 publications

References 41 publications

Design and Simulation of the Spiral Micromixer with Chaotic Advection

Design and Simulation of the Spiral Micromixer with Chaotic Advection

Thinning dynamics of the liquid thread at different stages in a rectangular cross junction

Computational analysis of interface evolution and droplet pinch-off mechanism in two-phase liquid flow through T-junction microfluidic system

Contact Info

Product

Resources

About