Numerical simulation on dynamic behaviors of bubbles flowing through bifurcate T-junction in microfluidic device*

Wu, Lei; Liu, Lingbo; Han, Xiaotian; Li, Qianwen

doi:10.1088/1674-1056/ab3f27

Cited by 8 publications

(4 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years, the research of multiphase flow has attracted significant attention in a variety of fields, such as energy, aerospace, environmental protection, life science, and beyond. [1][2][3] Several numerical approaches, such as the volume of fluid (VOF) method [4,5] and level-set method [6,7] have been developed to depict the movement and deformation of the interface involved in multiphase flows. However, the VOF method has the difficulty in accurately analyzing the surface normal, and the level-set method suffers the lack of mass conservation.…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann model for interface capturing of multiphase flows based on Allen–Cahn equation

Wang¹,

Tian²,

Liu³

2022

Chinese Phys. B

View full text Add to dashboard Cite

A phase-field-based lattice Boltzmann model is proposed for the interface capturing of multi-phase flows based on the conservative Allen–Cahn equation (ACE). By adopting the improved form of a relaxation matrix and an equilibrium distribution function, the time derivative ∂t (ϕ u ) induced by recovering the diffusion term in ACE is eliminated. The conducted Chapman–Enskog analysis demonstrates that the correct conservative ACE is recovered. Four benchmark cases including Zalesak’s disk rotation, vortex droplet, droplet impact on thin film, and Rayleigh–Taylor instability are investigated to validate the proposed model. The numerical results indicate that the proposed model can accurately describe the complex interface deformation.

show abstract

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann model for interface capturing of multiphase flows based on Allen–Cahn equation

Wang¹,

Tian²,

Liu³

2022

Chinese Phys. B

View full text Add to dashboard Cite

show abstract

“…Livinus and Verdin [8] observed that the pipe diameter, pipe inclination, and oil viscosity affected the drift velocity of the elongated bubble. Based on the VOF method, Wu et al [9] established a 2D transport model of gas to study the transport of gas in the liquid. Fernandes et al [10] proposed that as the liquid film enters the liquid plug, a large vortex forms at the head of the liquid plug, producing strong turbulence and causing the Air inside pipelines may occur due to various reasons: maintenance work, start-up operations, filling and emptying maneuvers, etc.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Gas Migration in Large Elevation Difference Oil Transmission Pipelines during the Commissioning Process

Feng¹,

Zhu²,

Song³

et al. 2022

Energies

View full text Add to dashboard Cite

Oil pipeline construction and operation in mountainous areas have increased in southwestern China, with oil consumption increasing. Such liquid pipelines laid in mountainous areas continuously undulate along the terrain, resulting in many large elevation difference pipe segments. Serious gas block problems often occur during the commissioning process of these pipelines due to the gas/air accumulation at the high point of the pipe, which causes pipeline overpressure and vibration, and even safety accidents such as bursting pipes. To solve this problem, the gas–liquid replacement model and its numerical solution are established with consideration of the initial gas accumulation formation and the gas segment compression processes in a U-shaped pipe during the initial start-up operation. Additionally, considering the interactions of the gas-phase transfer in the continuous U-shaped pipe, and the influence of the length, inclination angle, and backpressure on the air vent process, the gas migration model for a continuous U-shaped pipe is established to predict the gas movement process. Finally, the field oil pipe production data were applied to verify the model. The results demonstrate that the maximum deviation between the calculated pressure during the start-up process and real data is 0.3 MPa, and the critical point of crushing the gas in the pipe section is about 0.2 Mpa. Additionally, the results show that the mass transfer of the gas section in the multi-pipe hydraulic air vent process causes the gas accumulation section to increase in downstream of the pipe. This study’s achievements can provide theoretical guidance and technical support for the safe and stable operation of continuous undulating liquid pipelines with large drops.

show abstract

“…The multiphase pump is one of the core equipment in the process of transporting such a multiphase medium [1,2]. Otherwise, micro-/nanobubbles can be generated with the aid of a multiphase pump through different formation mechanics [3][4][5][6]. It has been widely employed in numerous industries, ranging from chemistry to biology [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Flow Rate on Turbulence Dissipation Rate Distribution in a Multiphase Pump

et al. 2021

View full text Add to dashboard Cite

The turbulence dissipation will cause the increment of energy loss in the multiphase pump and deteriorate the pump performance. In order to research the turbulence dissipation rate distribution characteristics in the pressurized unit of the multiphase pump, the spiral axial flow type multiphase pump is researched numerically in the present study. This research is focused on the turbulence dissipation rate distribution characteristics in the directions of inlet to outlet, hub to rim, and in the circumferential direction of the rotating impeller blades. Numerical simulation based on the RANS (Reynolds averaged Navier–Stokes equations) and the k-ω SST (Shear Stress Transport) turbulence model has been carried out. The numerical method is verified by comparing the numerical results with the experimental data. Results show that the regions of the large turbulence dissipation rate are mainly at the inlet and outlet of the rotating impeller and static impeller, while it is almost zero from the inlet to the middle of outlet in the suction surface and pressure surface of the first-stage rotating impeller blades. The turbulence dissipation rate is increased gradually from the hub to the rim of the inlet section of the first-stage rotating impeller, while it is decreased firstly and then increased on the middle and outlet sections. The turbulence dissipation rate distributes unevenly in the circumferential direction on the outlet section. The maximum value of the turbulence dissipation rate occurs at 0.9 times of the rated flow rate, while the minimum value at 1.5 times of the rated flow rate. Four turning points in the turbulence dissipation rate distribution that are the same as the number of impeller blades occur at 0.5 times the blade height at 0.9 times the rated flow rate condition. The turbulence dissipation rate distribution characteristics in the pressurized unit of the multiphase pump have been studied carefully in this paper, and the research results have an important significance for improving the performance of the multiphase pump theoretically.

show abstract

Numerical simulation on dynamic behaviors of bubbles flowing through bifurcate T-junction in microfluidic device*

Cited by 8 publications

References 42 publications

Lattice Boltzmann model for interface capturing of multiphase flows based on Allen–Cahn equation

Lattice Boltzmann model for interface capturing of multiphase flows based on Allen–Cahn equation

Modeling of Gas Migration in Large Elevation Difference Oil Transmission Pipelines during the Commissioning Process

Effect of Flow Rate on Turbulence Dissipation Rate Distribution in a Multiphase Pump

Contact Info

Product

Resources

About