Gas–Liquid Interaction Characteristics in a Multiphase Pump under Different Working Conditions

Deng, Yuxuan; Wang, Xiaodong; Xu, Jing; Li, Yanna; Kuang, Chunyan

doi:10.3390/pr10101977

Cited by 10 publications

(2 citation statements)

References 26 publications

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“…In this study, the Euler-Euler non-homogeneous phase model in ANSYS CFX is used to solve the "gas-liquid-solid" three-phase flow [31,32], and the following assumptions are made before numerical simulation:…”

Section: Governing Equations and Boundary Conditionsmentioning

confidence: 99%

The Influence of Shear-Thinning Characteristics on Multiphase Pump Vortex Structure Evolution, Pressure Fluctuation, and Gas-Solid Distribution

Chen,

Yang,

Peng

et al. 2024

Processes

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In the current landscape of natural gas hydrate extraction, the lifting pump assumes a pivotal role as the essential equipment for conveying subsea fluidized hydrate slurry to the wellhead. The inherent shear-thinning characteristics of natural gas hydrate slurry, compounded by the complex multiphase flow conditions of the “gas-liquid-solid” system, present significant challenges to the operational efficiency and stability of the lifting pump. Consequently, this study adopts a hybrid approach, combining experimental and numerical simulations, to comparatively investigate the impact of non-Newtonian and viscous Newtonian fluids on the hydraulic performance, vortex structure evolution, and induced pressure fluctuations in a multiphase pump. Concurrently, a comparative analysis is conducted on the influence of these two fluid types on the distribution patterns of the “gas-solid” two-phase system. The research findings indicate that the apparent viscosity variations are more pronounced in the diffuser region compared to the impeller region. Under non-Newtonian fluid conditions, two separation vortices emerge at the trailing edge of the diffuser, as opposed to a single separation vortex in the viscous Newtonian fluid, with the latter exhibiting a smaller vortex structure scale. Moreover, the shear-thinning characteristics intensify the interaction between the separated vortex and the mainstream, resulting in an exacerbation of pressure fluctuations. In contrast to the viscous Newtonian fluid, the rotor–stator interaction and shear-thinning characteristics play a predominant role in pressure fluctuations, with shear-thinning attributes giving rise to low-frequency pressure fluctuations. Additionally, shear-thinning characteristics significantly influence the distribution behavior of the gas-solid two-phase flow.

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Section: Governing Equations and Boundary Conditionsmentioning

confidence: 99%

The Influence of Shear-Thinning Characteristics on Multiphase Pump Vortex Structure Evolution, Pressure Fluctuation, and Gas-Solid Distribution

Chen,

Yang,

Peng

et al. 2024

Processes

View full text Add to dashboard Cite

show abstract

“…Then, it relies on the pressurizing capacity of the guide vane to allow the liquid to realize the conversion of kinetic energy to pressure energy. In practice, due to the different densities of gas and liquid, the conveying medium will be subjected to varying centrifugal forces as the impeller rotates, causing a series of flow disturbances such as flow separation, gas stagnation, and pressure surge [9,10]. These phenomena cause a sharp increase in the flow losses of the pump components and thus lead to a sharp decline in pump performance and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Flow Control in Multiphase Pumps Based on Separated Trailing Edge Flap

Zhou,

Han,

et al. 2023

Processes

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In developing and transporting significant oil fields in deep-sea environments, multiphase pumps are considered crucial energy conversion equipment. Ensuring their safe, efficient, and stable operation is currently a primary focus of research. The intermittent aggregation of the gas phase at the trailing edge flap of the impeller blades in multiphase pumps can lead to periodic and significant fluctuations in flow rate and outlet pressure, posing a threat to the overall operational safety of the pump system. Based on aerodynamic principles, this paper presents the design of a separate trailing edge flap for the impeller blades. The inner nodal method is applied to determine the design scheme of the trailing edge flap for the multiphase pump. A numerical approach is employed to analyze the impact of the flap deflection angle on the internal flow characteristics to provide theoretical guidance for the structural optimization of multiphase pumps. The results indicate that the influence of the deflection angle on the pump efficiency is complex and affected by a critical angle value. When the deflection angle is below the critical value, the trailing edge flap can effectively reduce the formation of energy dissipation vortices and radial pressure gradients within the impeller channel, enabling a significant improvement in the gas-phase aggregation phenomenon caused by gas–liquid separation. However, additional energy losses occur at the connection between the trailing edge flap and the main blade body for deflection angles exceeding the critical value. When the trailing edge flap length is 0.25 l and the deflection angle is 5°, the efficiency is improved by 3.4% compared to the original model. Consequently, the pressurization capacity of the pump is compromised. In the design and application of trailing edge flaps, a careful balance between various factors is required to ensure both the stability and high efficiency of the pump system.

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Effects of the inlet gas volume fraction on the structural dynamic characteristics of gas‒liquid multiphase pumps

Wu,

Zhu,

Feng

et al. 2025

Applied Ocean Research

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Gas–Liquid Interaction Characteristics in a Multiphase Pump under Different Working Conditions

Cited by 10 publications

References 26 publications

The Influence of Shear-Thinning Characteristics on Multiphase Pump Vortex Structure Evolution, Pressure Fluctuation, and Gas-Solid Distribution

The Influence of Shear-Thinning Characteristics on Multiphase Pump Vortex Structure Evolution, Pressure Fluctuation, and Gas-Solid Distribution

Flow Control in Multiphase Pumps Based on Separated Trailing Edge Flap

Effects of the inlet gas volume fraction on the structural dynamic characteristics of gas‒liquid multiphase pumps

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