Phase split characteristics of slug and annular flow in a dividing micro-T-junction

Li, Hongwei; Li, Jiwei; Zhou, Yunlong; Liu, Bo; Sun, Bin; Yang, Di; Fan, Xiaomeng

doi:10.1016/j.expthermflusci.2016.08.024

Cited by 18 publications

(3 citation statements)

References 30 publications

(48 reference statements)

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“…The change of the apparent velocity of the liquid phase in the inlet apparent velocity has a greater impact on the overall phase separation, which is due to the high density of the liquid phase itself, the more sensitive liquid membrane separation effect close to the wall, and other characteristics. At the same time, it can be seen from the flow pattern diagram that the effect of the apparent velocity is roughly the same as that of the flow pattern, showing the same rule [35][36][37][38]. The cross-scale T-shaped microchannel can realize the true separation of two-phase flow.…”

Section: Introductionmentioning

confidence: 61%

Study on effect of gas-liquid two phase physical feature on slug flow in microchannels

Wang

2023

Front. Phys.

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At present, there are relatively few studies on the slug flow generation mode obtained by exchanging gas-liquid two-phase inlets. In this study, an experimental system combining microfluidic devices and high-speed cameras was used to study the effects of gas-liquid two-phase flow rate, liquid physical parameters, etc., On the characteristic length, generation period and other generation characteristics of slug flow, and dimensionless analysis was conducted to investigate the main factors affecting the characteristic length of gas slug. Results show that 1) when the gas flow rate affects the aeroelastic generation characteristics, the aeroelastic characteristic length increases from 443 μm when the gas flow rate increases changes to 657 μm. The generation period decreases rapidly at first and then the change amplitude slows down. The maximum value of aeroelastic generation frequency is 217 s-1; 2) when studying the effect of different liquid flow rates, increasing the liquid flow rate, the characteristic length of the gas bomb gradually decreases, and the generation period of the gas bomb gradually increases. Aeroelastic characteristic length from 770 μm changes to 378 μm. The range of aeroelastic generation cycle is 4–13.4 ms, and the maximum value of aeroelastic generation frequency is 250 s-1; 3) there is a functional relationship between the ratio of aeroelastic characteristic length to channel size L/d and dimensionless gas-liquid flow ratio Q*, Reynolds number Re, Weber number We: L/d=3.677Q*0.58/Re0.11.

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Section: Introductionmentioning

confidence: 61%

Study on effect of gas-liquid two phase physical feature on slug flow in microchannels

Wang

2023

Front. Phys.

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“…However, for slug flow, the total superficial velocity is influenced by the inlet gas and liquid velocities. In this way, Chen et al and Li et al studied the transient behavior of gas–liquid slug flow through a branching T‐junction and concluded that the split characteristic of liquid was mainly influenced by liquid inlet velocity.…”

Section: Introductionmentioning

confidence: 99%

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

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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.

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“…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

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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.

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Phase split characteristics of slug and annular flow in a dividing micro-T-junction

Cited by 18 publications

References 30 publications

Study on effect of gas-liquid two phase physical feature on slug flow in microchannels

Study on effect of gas-liquid two phase physical feature on slug flow in microchannels

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

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