Split of two-phase plug flow with elongated bubbles at a microscale branching T-junction

Kim, Seok; Lee, Sang Yong

doi:10.1016/j.ces.2015.04.020

Cited by 22 publications

(7 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The liquid requires more energy to get into the outlet 2 due to the sudden change in angular velocity. Moreover, the intrinsic asymmetric characteristic of branching T‐junction makes the gas bubble get in outlet 2 prior to outlet 1 . In our study, the curve points of longer bubble mainly belong to obstructing mode, whereas the curve points for shorter bubble to some extent belong to nonobstructing mode.…”

Section: Resultsmentioning

confidence: 54%

“…As for obstructing mode located at the center zone of abscissa, there is a linear relationship between the gas and liquid split ratio. Because only negligible liquid phase passes through the wall film while breakup process, the gas–liquid two phase passes through the two side branches in turn and the split ratio of each phase is proportional to the flow rates in the two branches . As can be seen from Figure a, the slope of the curve get changed at lower or higher flow ratio, which indicates the transition region between obstructing and nonobstructing modes.…”

Section: Resultsmentioning

confidence: 92%

“…The validation of the numerical method was also checked. Figure compares the split ratio of the numerical tests with the experimental results of Kim and Lee for the same operating conditions and fluid property. As can be seen from the two pictures, there is little difference between the numerical and the experimental results, except for the cases at extremely higher or lower flow ratio.…”

Section: Resultsmentioning

confidence: 99%

“…Subsequently, they investigated the bubble breakup process with permanent and partly obstruction in a microfluidic T‐junction . Kim and Lee reached a conclusion that maldistribution was prominent with shorter gas and liquid slugs via numerical study. However, some other interesting issues have not been addressed in these studies.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical study of phase split characteristics of slug flow at a branching micro‐T‐junction

Dong

Zhang

Wang

et al. 2018

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

The phase split behavior of air-water slug flow at branching micro-T-junctions was studied by the volume of fluid model. The effects of velocity, surface tension, and viscosity on phase split results have been tested by slug units of fixed length. The split of a gas bubble at the T-junction shows obstructing and nonobstructing modes. Through comparison, we found that the appearance of tunnels changes the driving force of bubble breakup from upstream pressure to viscous shearing force. Split features are influenced by the length of slug unit and the flow ratio in the obstructing mode. Nevertheless, the viscous force and surface tension should not be slighted for nonobstructing mode. Moreover, tendency of the flow maldistribution of nonobstructing mode is more pronounced with higher velocity and smaller surface tension. The liquid slug length has a negligible effect on the split results of gas phase. Thus, the results of two-phase split could be obtained from the gas split ratio solely. Pattern diagram for the transition between the 2 modes was proposed. Eventually, the importance of the length information of slug unit was also verified by the predictive model of phase split that formulated with the regression analysis of numerical data.

show abstract

Section: Resultsmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical study of phase split characteristics of slug flow at a branching micro‐T‐junction

Dong

Zhang

Wang

et al. 2018

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

show abstract

“…It is reported that gas and water can be separated due to the difference of inertial effects [26,[28][29][30]. Small bubbles or solid particles are more likely to be carried by the fluid flow, while large bubbles or solid particles are likely to deviate from the streamline of the fluid, and small bubbles or slug bubbles show different inertial effects [31][32][33][34]. In a flow channel junction (intersection), different gas-water ratios will lead to different separation results [29] since the influence of the inertial effect is different.…”

Section: Introductionmentioning

confidence: 99%

Visualized Experimental Investigation on the Gas-Water Distribution Characteristics in Intersecting Fractures

2018

View full text Add to dashboard Cite

In coal-bed methane recovery, water is generally drained out along with gas. In order to address the influence of different gaswater ratios, fracture intersecting angles, and gas desorption positions on gas and water distributions along fractures and hence understand the two-phase flow behavior in fracture network, an experimental study was conducted on three artificial models with intersecting fractures. The results show that (1) with gas and water injected at different rates, the flow of water and gas is divided into three stages. In the first stage, gas flowed as small bubbles. The transport of gas was stable, which was similar to single-phase laminar flow. The difference in gas injection positions led to totally contrary flow results of water and gas. (2) In the second stage, larger gas bubbles were formed and the interactions between water and gas became serious. The gas-water distribution was dominated by different inertias between water and gas. The difference in gas injection positions did not take much effect on the gas-water distribution. (3) In the third stage, the influence of the inertia difference was still important, but some other factors also influenced the gas-water distribution. The difference in gas injection positions led to different distribution results. (4) The water injection rate has impact on the distribution of the water flow rate in each outlet. In the second stage, when water was injected at small rates, the difference between the cases in which gas was injected from different positions can be neglected. When water injection rates became larger, this difference became obvious. (5) The intersecting angle of the fractures influences the distribution of water and gas. The larger the intersecting angle is, the larger the inertial effect will be. Consequently, the intersecting angle influences the length of the second stage, which is dominated by the inertial effect.

show abstract

Effect of nonlinear drag on the onset and the growth of the miscible viscous fingering in a porous medium

Kim

2022

Korean J. Chem. Eng.

View full text Add to dashboard Cite

Split of two-phase plug flow with elongated bubbles at a microscale branching T-junction

Cited by 22 publications

References 29 publications

Numerical study of phase split characteristics of slug flow at a branching micro‐T‐junction

Numerical study of phase split characteristics of slug flow at a branching micro‐T‐junction

Visualized Experimental Investigation on the Gas-Water Distribution Characteristics in Intersecting Fractures

Effect of nonlinear drag on the onset and the growth of the miscible viscous fingering in a porous medium

Contact Info

Product

Resources

About