Bubble Motion in a Converging–Diverging Channel

Konda, Harsha; Tripathi, Manoj Kumar; Sahu, Kirti Chandra

doi:10.1115/1.4032296

Cited by 15 publications

(8 citation statements)

References 29 publications

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“…28−31 Reyssat 32 proposed a theoretical model to calculate the motion of droplets and bubbles in the wedge formed by two plates. Konda et al 33 numerically investigated the migration of bubbles in a twodimensional convergence−divergence channel. Torres 34 done a lot of work on droplet motion in nonwetting wedges and explored the effects of wedge opening angles, droplet volume, viscosity, etc.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Droplet can move spontaneously between two nonparallel plates, and the different opening angles of the wedge formed by the two plates will lead to different movements of the droplet. − Reyssat proposed a theoretical model to calculate the motion of droplets and bubbles in the wedge formed by two plates. Konda et al numerically investigated the migration of bubbles in a two-dimensional convergence–divergence channel. Torres has done a lot of work on droplet motion in nonwetting wedges and explored the effects of wedge opening angles, droplet volume, viscosity, etc.…”

Section: Introductionmentioning

confidence: 99%

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Motion of Droplets in Lyophilic Axially Varying Geometry-Gradient Tubes

Xiao

et al. 2023

Langmuir

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Droplet transport occurs frequently in nature and has a wide range of applications. We studied the droplet motion in a lyophilic axially varying geometry-gradient tube (AVGGT). The motion of the AVGGT in two directionsfrom the large opening side (L) to the small opening side (S) and from S to Lwas theoretically and experimentally analyzed. The droplet dynamic behaviors, such as the self-transport behavior and the droplet stuck behavior, are explored from the view points of mechanics and energy. We found that the surface tension force of a three-phase contact line can be either a driving or an impeding force depending on the various droplet geometries in different AVGGTs. An important contributing factor to the self-transport behavior of a droplet moving from L to S in an AVGGT is the bridge liquid force caused by negative pressure inside the droplet, which is always pointing in the direction of S. As a result of experiments, we investigated the relationship between droplet motion and correlated parameters. The theoretical model based on the simplified Navier–Stokes equation was developed to explain the corresponding mechanism of the droplet motion. Additionally, dimensional analysis was carried out for the droplet stuck behavior of a droplet moving from S to L in an AVGGT to investigate the relationship between the droplet stopping location and the correlated parameters and thus obtain the required geometry for the droplet stopping location.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Motion of Droplets in Lyophilic Axially Varying Geometry-Gradient Tubes

Xiao

et al. 2023

Langmuir

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“…The volume of fluid (VOF) method was widely applied to track the two-phase interface and simulate bubble motion in the liquid phase. , Cai et al conducted a VOF simulation for the bubble formation and detachment on a wall orifice in a Venturi-type bubble generator . Konda et al conducted numerical studies on bubble migration in a two-dimensional converging–diverging channel using a finite volume flow approach . The simulation work of two-phase flow was restricted to high Reynolds number and computational ability.…”

Section: Introductionmentioning

confidence: 99%

“…26 Konda et al conducted numerical studies on bubble migration in a two-dimensional converging−diverging channel using a finite volume flow approach. 27 The simulation work of two-phase flow was restricted to high Reynolds number and computational ability. So, there is no simulation case related to the continuous crushing process of bubbles under a higher Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Motion and Breakup Characteristics of a Single Bubble in a Venturi Channel

Ding

Chen

et al. 2021

Ind. Eng. Chem. Res.

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The Venturi channel is a dominant part of Venturi-type microbubble generator. In the current study, a threedimensional virtual bubble was patched to the steady flow of a Venturi channel by the volume of fluid model coupled with the level set method. The bubble roundness and motion trajectory were defined to describe the motion and deformation process, while the gas−liquid interfacial area was indicated to evaluate the breakup characteristics. The numerical simulation model was then validated through a visualization experiment. The motion trajectory and roundness of the patched bubble were sensitively affected by the gravity direction. When the gravity direction was vertical to the liquid flow, the bubble experienced more violent deformation than that of the horizontal direction. Then, the bubble experienced a serious breakup once entering the divergent section, and the breakup pattern was divided into binary breakup mode and multiple breakup mode owing to the bubble coordinate position. Through force analysis, the axial pressure gradient force, which contributed to the binary breakup mode, mainly existed in the central region, and the radial shearing force, which contributed to multiple breakup mode, existed in the sidewall region. Considering the positive correlation between the gas−liquid interfacial area and the daughter bubble size, the gas−liquid interfacial area ratio δ was proposed. The functional relationship between δ and the liquid-phase Reynolds number Re or the divergent angle β was typical logarithmic, respectively. The δ value increased with the increase of Re and β, whereas the correlation of Re to δ was much more significant.

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“…* gtm@iitg.ernet.in On the other hand, Mortazavi and Tryggvason [13] studied the deformation and lateral migration of a two-dimensional (2D) drop in a flow channel at finite Reynolds number using the full Navier-Stokes equations with a finite-difference and front-tracking approach. Konda et al [14] numerically studied migration of a droplet in a converging-diverging channel using a finite-volume approach and demonstrated droplet shape oscillations while it migrates inside the channel due to an imposed pressure gradient. Nourbaksh and Mortazavi [15] reported the dependency of the drop migration on the viscosity ratio.…”

Section: Introductionmentioning

confidence: 99%

Cross-stream migration of drops suspended in Poiseuille flow in the presence of an electric field

et al. 2018

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The present study focuses on the cross-stream migration of a neutrally buoyant two-dimensional drop in a Poiseuille flow in a channel under the influence of an electric field. In the absence of an electric field, the important nondimensional parameters describing this problem are the viscosity ratio (λ) between the drop fluid and the surrounding medium, the ratio of drop diameter to channel height (a^{*}), and the capillary number (Ca). The influence of all these parameters on drop migration is investigated. It is observed that a large drop moves slowly as compared to a smaller drop, but attains a steady shape at the center line of the channel. The increase in value of the capillary number enhances the cross-stream migration rate, while the increase in viscosity ratio reduces the tendency of the drops to move towards the channel center line. The presence of an electric field introduces additional interfacial stresses at the drop interface, which in turn alters the dynamics observed in the absence of an electric field. Extensive computations are carried out to analyze the combined effect of the electric field and the shear flow on the cross-stream migration of the drop. The computational results for a perfect dielectric indicate that the droplet migration enhances in the presence of an electric field. The permittivity ratio (S) and the electric field strength (E) play major roles in drop migration and deformation. Computations using the leaky dielectric model also show that for certain combinations of electrical properties the drop undergoes immense elongation along the direction of the electric field. The conductivity ratio (R) is again a vital parameter in such a system of fluids. It is further observed that for certain conditions the leaky dielectric drops exhibit rotation together with translation.

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Bubble Motion in a Converging–Diverging Channel

Cited by 15 publications

References 29 publications

Motion of Droplets in Lyophilic Axially Varying Geometry-Gradient Tubes

Motion of Droplets in Lyophilic Axially Varying Geometry-Gradient Tubes

Numerical Simulation on the Motion and Breakup Characteristics of a Single Bubble in a Venturi Channel

Cross-stream migration of drops suspended in Poiseuille flow in the presence of an electric field

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