Hydrodynamics of liquid-liquid two-phase flow accounting for the coupling of dean vortices and Poiseuille flow

Ge, Shixiong; Zhang, Taoxian; Tao, Chun; Huang, Weixing; Pan, Dawei

doi:10.1016/j.cej.2023.141421

Cited by 6 publications

(5 citation statements)

References 32 publications

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“…Besides, the core of our numerical simulation is the VOF–CSF model, which is usually employed to track the interface evolution between two immiscible phases. In our previous work, the VOF–CSF model was also successfully applied to track the interface evolution under various conditions, which further validates the credibility of the VOF–CSF model used in our manuscript. ,, …”

Section: Methodssupporting

confidence: 78%

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Spontaneous Formation Mechanisms of Droplets in Step Emulsification

Zhang

Tao

et al. 2023

Ind. Eng. Chem. Res.

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Droplet step emulsification has been proven to possess the unique advantage of decoupling the flow parameters, which obviously contributes to the realization of the mass production of monodisperse droplets. However, a complete understanding of the dynamic characteristics underlying droplet spontaneous formation in step emulsification has not been fully revealed and remains a challenge because the channel confinement effect always results in the complexity in interface spatiotemporal evolution under various conditions. In this work, the spontaneous formation mechanisms of droplets in step emulsification are numerically investigated via a VOF–CSF model. The physics behind the two distinct flow patterns regarding dripping and jetting are deeply revealed based on the local flow field structures and pressure distribution, and it was found that in dripping, before final pinch-off of the neck, a finite time singularity usually exists, thus leading to infinite velocity and pressure inside the neck. However, in jetting, as the droplet steadily expands, the velocity and pressure inside the neck finally reach an equilibrium state. Besides, by taking multiple variables with a wide range into account, the flow pattern diagram and the prediction correlation of droplet size are established with several dimensionless numbers, exhibiting excellent universality. In particular, the force field characteristics previously undocumented for droplet step emulsification are also quantitatively clarified from a new perspective of momentum conservation. The results obtained in this study reveal the spontaneous formation mechanisms of droplets in step emulsification, thus providing theoretical guidance for precisely regulating the emulsification process.

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Section: Methodssupporting

confidence: 78%

“…In our previous work, the VOF−CSF model was also successfully applied to track the interface evolution under various conditions, which further validates the credibility of the VOF−CSF model used in our manuscript. 38,41,42 3. RESULTS AND DISCUSSION…”

Section: Numerical Solutionmentioning

confidence: 99%

Spontaneous Formation Mechanisms of Droplets in Step Emulsification

Zhang

Tao

et al. 2023

Ind. Eng. Chem. Res.

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“…Among them, generator units with power below 750KW mostly use forced air cooling, while for large and medium-sized wind turbines with power greater than 750KW, circulating liquid cooling is required to meet the cooling requirements. [3]Zhang Chengbin [10] proposed the application of pump driven two-phase flow circuit cooling technology in the wind turbine cabin in the cooling research of wind turbines. Existing research has shown that pump driven two-phase flow circuit cooling technology has advantages such as strong heat transfer ability, good temperature uniformity, and light weight, making it suitable for long-distance, distributed, and non-uniform heat sources for heat dissipation and temperature control.…”

Section: Introductionmentioning

confidence: 99%

Two phase flow evaporative cooling technology for wind turbine cabin group

Hu,

2024

Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023)

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The thermal management of wind turbines is an important guarantee for their long-term stable and reliable operation. This article combines a new type of pump driven two-phase flow cooling system with the heat dissipation system of wind turbines, compares wind turbines using two-phase flow cooling systems, studies their system performance during simulated operation in a certain wind turbine cabin, and conducts fitting research and performance analysis on their thermal characteristics. The results indicate that a water cooling system with a flow rate of 3L/min can provide heat dissipation that can be achieved using only a two-phase flow cooling system with a flow rate of 0.05L/min. In transitional seasons and winter conditions, utilizing pneumatic heat pipe technology and fluorine pump technology for refrigeration, fully utilizing natural cooling sources, the annual energy efficiency ratio (AEER) reaches 8-10, and the new heat dissipation technology can ensure the long-term reliable and safe operation of future wind turbines.

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“…Wan et al [13] explored the evolution of the turbulent flow field and the influence of the vortex by using the LES model to simulate the double-nozzle impinging stream, and found the more targeted frequency components of the turbulent structure and the influence of the main vibration mode. Ge et al [14] researched the hydrodynamic characteristics of liquid-liquid two-phase flow, and found that the generation and development of vortices are affected by pressure gradient and fluid velocity, while the fluid is affected by shear force along its flow direction. Liu et al [15] revealed the law of synergy of particle physical quantities based on the synergy principle of the heat transfer enhancement field, and the synergy angle between velocity and pressure gradient was obtained.…”

Section: Introductionmentioning

confidence: 99%

“…Ge et al. 14 researched the hydrodynamic characteristics of liquid‐liquid two‐phase flow, and found that the generation and development of vortices are affected by pressure gradient and fluid velocity, while the fluid is affected by shear force along its flow direction. Liu et al.…”

Section: Introductionmentioning

confidence: 99%

Study on the Turbulent Vortex Structure Characteristics of a Two‐Layer Impinging Stream Reactor

Zhang,

Liu,

Dong

et al. 2023

Chem Eng & Technol

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The structure of the turbulent vortex in a two‐layer impinging stream reactor was studied by large eddy simulation. The distributions of vortex intensity, turbulent kinetic energy, and shear stress at different Reynolds numbers Re, nozzle spacings L, and nozzle layer spacings are discussed. The relationship between vortex structure and mixing effect in the flow field is revealed. The effects of longitudinal swirls and shear flow characteristics are analyzed. Finally, the field synergy theory is used for evaluation. With increasing Re, the vortex intensity and average shear stress increase. The nozzle spacing and layer spacing affect the mixing effect in the reactor by controlling the change of vortex structure in the flow field. When L/D = 3, where D is the nozzle diameter, the energy loss is the smallest and the mixing effect is the best. The research results provide a theoretical reference for the structural optimization of the impinging stream reactor.

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Hydrodynamics of liquid-liquid two-phase flow accounting for the coupling of dean vortices and Poiseuille flow

Cited by 6 publications

References 32 publications

Spontaneous Formation Mechanisms of Droplets in Step Emulsification

Spontaneous Formation Mechanisms of Droplets in Step Emulsification

Two phase flow evaporative cooling technology for wind turbine cabin group

Study on the Turbulent Vortex Structure Characteristics of a Two‐Layer Impinging Stream Reactor

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