Liquid-vapor two-phase flow in centrifugal pump: Cavitation, mass transfer, and impeller structure optimization

Li, Gaoyang; Ding, Xuhui; Wu, Yao; Wang, Sirui; Liu, Dong; Wang, Yu; Wang, Xuezheng; Zhu, Yonghong; Guo, Yuting

doi:10.1016/j.vacuum.2022.111102

Cited by 30 publications

(8 citation statements)

References 36 publications

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“…Cavitation significantly impacts the flow of liquids and the performance of fluid equipment [32], mainly when it occurs at high speed and high pressure. Liquids are usually mixed with a certain proportion of gas.…”

Section: Cavitationmentioning

confidence: 99%

Research on Cavitation Characteristics and Influencing Factors of Herringbone Gear Pump

Yang,

Lee,

Lee

2024

CMES

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Cavitation is a common issue in pumps, causing a decrease in pump head, a fall in volumetric efficiency, and an intensification of outlet flow pulsation. It is one of the main hazards that affect the regular operation of the pump. Research on pump cavitation mainly focuses on mixed flow pumps, jet pumps, external spur gear pumps, etc. However, there are few cavitation studies on external herringbone gear pumps. In addition, pumps with different working principles significantly differ in the flow and complexity of the internal flow field. Therefore, it is urgent to study the cavitation characteristics of external herringbone gear pumps. Compared with experimental methods, visual research and cavitation area identification are achieved through computation fluid dynamic (CFD), and changing the boundary conditions and shape of the gear rotor is easier. The simulation yields a head error of only 0.003% under different grid numbers, and the deviation between experimental and simulation results is less than 5%. The study revealed that cavitation causes flow pulsation at the outlet, and the cavitation serious area is mainly distributed in the meshing gap and meshing area. Cavitation can be inhibited by reducing the speed, increasing the inlet pressure, and changing the helix angle can be achieved. For example, when the inlet pressure is 5 bar, the maximum gas volume fraction in the meshing area is less than 50%. These results provide a reference for optimizing the design and finding the optimal design parameters to reduce or eliminate cavitation.

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Section: Cavitationmentioning

confidence: 99%

Research on Cavitation Characteristics and Influencing Factors of Herringbone Gear Pump

Yang,

Lee,

Lee

2024

CMES

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“…The results confirmed the feasibility of improving hydraulic performance by optimizing the blade profile of sewage pumps. Li et al [7] utilized Computational Fluid Dynamics (CFD) numerical simulation technology to conduct numerical simulations and experimental verifications of gas-liquid two-phase flow and impeller structure under different operating conditions of centrifugal pumps. During the research process, the structural parameters of the impeller were studied, and the optimal combination of the number of impeller blades, blade wrap angle, and blade installation angle was obtained through simulation, providing a theoretical basis for the erosion resistance of centrifugal pumps.…”

Section: Introductionmentioning

confidence: 99%

Research on the Flow Characteristics of Power-Law Fluids in Self-Priming Sewage Pumps

Li,

Zheng,

Shao

et al. 2024

Water

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To conduct a more in-depth study of the flow mechanism of power-law fluids within sewage pumps, this paper focuses on self-priming sewage pumps, with typical power-law fluid (Carboxymethyl Cellulose, CMC) as the conveying medium. The constitutive equations for sewage and typical power-law fluid (CMC solution) were established using the power-law model. Through numerical calculation methods, the non-steady flow field inside the pump of different concentration power-law fluids was analyzed from various aspects such as velocity, pressure, vorticity, and wall shear stress. The pressure pulsations at key locations in the pump flow field were monitored and analyzed. At the rated flow rate, when the concentration of CMC solution increased from 0.5% to 2.0%, the channel pressure and tongue pressure decreased by 16.5% and 3.5%, respectively. This indicates that the pressure on the impeller blades, within the flow passages, and at the tongue of the volute all decrease with the increase in concentration of CMC solution. This may alter the fluid flow pattern, leading to more vortex motion and shear deformation, while also reducing the pump’s pressure boosting capability, thereby affecting the pump’s performance stability. It can be inferred from quantitative comparisons that changes in rheological properties had a significant impact on the flow characteristics of sewage pumps. This paper reveals that some flow characteristics of power-law fluids in sewage pumps, providing a theoretical and reference basis for the performance optimization and flow mechanism research of sewage pumps.

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“…Turbomachines are hydrodynamic equipment that uses a rotating impeller to transfer power from the motor to the fluid (Li et al 2022) and are used in different applications such as chemical industry, manufacturing, agriculture, and transportation (Wang et al 2022). A suitable design and operation of a centrifugal pump imply an efficient momentum, mass, and heat transfer to other process equipment such as heat exchangers, shock and mixing tanks, reactor systems, and distillation towers, among others (Perez 2022;Li et al 2022;Wang et al 2022).…”

Section: Introductionmentioning

confidence: 99%

“…The development of tools that allow the early detection of these phenomena has been the objective of different scientific and engineering works that seek to find the optimal operating conditions for hydrodynamic machines and maximize their life span. However, not only these tools are aimed to work, but also offer non-invasive methods that protect the integrity of the machines and reduce costs (Al-Obaidi 2019; Obidov et al 2021;Li et al 2022).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental-Modeling Evaluation Between Hydraulic and Electrical Variables Using Copulas and Spectral Analysis for a Centrifugal Pump

2023

JAFM

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Centrifugal pumps are turbomachines that have wide industrial applications and could perform in different ways such as pump and turbine mode. The maintenance of this equipment is mostly carried out using invasive methods that are expensive, time-consuming, and even complicated. The application of non-invasive methods is sought since they offer the advantage of real-time monitoring without stopping the process, reducing component assembly and disassembly times and providing a faster response. The aim of this work is done an experimental investigation that shows evidence about how the information on the hydraulic variables can be obtained if the electrical variables are monitored for the modes of operation such as pump and turbine. This work is divided into two parts, the first part is based on a statistical analysis to perform a multivariate adjustment through copulas and probability distributions. The second part focuses on the graphical analysis of the power density spectra for the hydraulic variables, the torque, and the defined electrical variables. The amplitude peaks of each variable and which peaks are common between them are determined. A statistically significant fit for Tawn type 2 copula is obtained with the indicator variable of pressure fluctuation and a multivariate transformation of the three-phase network currents. In the spectra analysis, common amplitude peaks are observed between the spectra that indicate the information flow on the phenomena between the hydraulic variables and the electrical variables.

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Liquid-vapor two-phase flow in centrifugal pump: Cavitation, mass transfer, and impeller structure optimization

Cited by 30 publications

References 36 publications

Research on Cavitation Characteristics and Influencing Factors of Herringbone Gear Pump

Research on Cavitation Characteristics and Influencing Factors of Herringbone Gear Pump

Research on the Flow Characteristics of Power-Law Fluids in Self-Priming Sewage Pumps

Experimental-Modeling Evaluation Between Hydraulic and Electrical Variables Using Copulas and Spectral Analysis for a Centrifugal Pump

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