Evaluation of different turbulence models on simulation of gas-liquid transient flow in a liquid-ring vacuum pump

Guo, Guangqiang; Zhang, Renhui; Yu, Hongxing

doi:10.1016/j.vacuum.2020.109586

Cited by 20 publications

(9 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the LES model, eddies larger than the grid scale are directly calculated, whereas the small eddies are solved by introducing turbulence model. 18 The continuity equation…”

Section: Numerical Methods and Boundary Conditionsmentioning

confidence: 99%

“…The present work uses the Smagorinsky Lilly Sub-Grid-Scale (SGS) model, the eddy viscosity is modeled as 18,21…”

Section: Numerical Methods and Boundary Conditionsmentioning

confidence: 99%

“…In the LES model, eddies larger than the grid scale are directly calculated, whereas the small eddies are solved by introducing turbulence model. 18 The continuity equation and Navier-Stokes equation after filtering are as follows 18–21 where the superscript‘-’denotes a grid-scale filtering operation.…”

Section: Calculation Model and Numerical Methodsmentioning

confidence: 99%

“…The present work uses the Smagorinsky Lilly Sub-Grid-Scale (SGS) model, the eddy viscosity is modeled as 18,21 where Cs is the Smagorinsky constant, which is set to 0.17. Sijtrue¯ is the mean strain rate tensor, and Δ is the SGS filter length.…”

Section: Calculation Model and Numerical Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Research on inner flow and energy characteristics of air ejector for liquid-ring vacuum pump

Jiang

Zhang

Chen

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

Self Cite

View full text Add to dashboard Cite

To analyze the complex flow characteristics, and reveal the mechanisms of energy transfer and hydraulic loss of the liquid-ring pump ejector. The numerical simulation and experiment were applied to analyze the complex shock wave structure, vortex evolution characteristics in the ejector and its influence on hydraulic performance, which provides a novelty reference for the optimization design of the ejector. Furthermore, novelty is expressed in the performance analysis of the ejector based on the performance of its matching liquid-ring pump. The results show that the λ-shock wave and Mach disk are formed inside the nozzle under the action of supersonic jet, and the triple point is formed as the incident shock wave, the reflected shock wave and the Mach disk intersect. The shock wave, as it propagates, changes from Mach reflection to regular reflection, and meanwhile, the position of triple point moves from the initial Mach disk to the new Mach disk. With the interaction of shock wave and jet boundary layer, the shock train is formed in the core region of the jet. The pressure, density and Mach number are oscillatory distributed in the shock wave region. There is a relatively large velocity gradient between the high speed primary flow and the low speed secondary flow near the outlet of nozzle, which induces the formation of opposite rotating vortices in the shear layer of the cylinder. With the evolution of the vortex, the high speed jet transfers energy through the cylindrical shear layer and is accompanied by the large hydraulic loss. The total entropy production of the ejector increases with the increase of primary flow pressure. The entropy production rate has a strong correlation with the vorticity magnitude.

show abstract

“…In the LES model, eddies larger than the grid scale are directly calculated, whereas the small eddies are solved by introducing turbulence model. 18 The continuity equation…”

Section: Numerical Methods and Boundary Conditionsmentioning

confidence: 99%

“…The present work uses the Smagorinsky Lilly Sub-Grid-Scale (SGS) model, the eddy viscosity is modeled as 18,21…”

Section: Numerical Methods and Boundary Conditionsmentioning

confidence: 99%

Section: Calculation Model and Numerical Methodsmentioning

confidence: 99%

Section: Calculation Model and Numerical Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Research on inner flow and energy characteristics of air ejector for liquid-ring vacuum pump

Jiang

Zhang

Chen

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

Self Cite

View full text Add to dashboard Cite

show abstract

“…-The variation in the energy conservation rate is appropriate during the operation of the pump. Renhui Zhang et al [26] Gas-liquid two-phase flow investigation in LRVP using three models of turbulence flow (RNG k-ε, SST k-ω, and LES).…”

Section: Theoretical and Experimentalmentioning

confidence: 99%

A Comprehensive Review of Liquid Ring Vacuum Pumps and Compressors for Improving Global Efficiency and Energy Saving

Mahmood¹,

Viktorovich

Vyacheslavovich

et al. 2022

AJSE

View full text Add to dashboard Cite

Liquid ring vacuum pumps and compressors are mechanical positive displacement turbomachines that can operate in the mode of both vacuum compressor and vacuum pump. They are widely used in the fields of filtration, cryogenic, reaction, gas injection, condensation, evaporation, and convective drying. Despite their low performance, they have many advantages such as low costs, simplicity, reliability, improve suction characteristics, and in many cases, can provide a more efficient option. Improving efficiency is the key to decrease energy consumption and costs. The article analyzed and evaluated the previous investigations regarding these machines with a focus on challenges of improving efficiency, advances in numerical simulation, and experiments to afford beneficial insight on future research and next steps. The study revealed that the thermal interaction and the cavitation phenomenon are among the most important problems that require further research.

show abstract

Experimental study on pressure fluctuation characteristics of gas–liquid flow in liquid ring vacuum pump

Guo

Zhang

2022

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

Evaluation of different turbulence models on simulation of gas-liquid transient flow in a liquid-ring vacuum pump

Cited by 20 publications

References 14 publications

Research on inner flow and energy characteristics of air ejector for liquid-ring vacuum pump

Research on inner flow and energy characteristics of air ejector for liquid-ring vacuum pump

A Comprehensive Review of Liquid Ring Vacuum Pumps and Compressors for Improving Global Efficiency and Energy Saving

Experimental study on pressure fluctuation characteristics of gas–liquid flow in liquid ring vacuum pump

Contact Info

Product

Resources

About