Numerical Simulation of Gas Flow Field in Gas-Liquid Hydrocyclone Separator

The gas flow field in hydrocyclone separator was numerically simulated by applying RSM turbulence model, and the gas flow velocity distribution and stress distribution were calculated. According to the characteristics of gas flow distribution within the separator, it is found that: (1) the rotating strength of gas flow is related to the outlet angle of guide blade, the greater the outlet angle, the smaller the tangential velocity; (2) the obvious short circuit flow distribution under the exhaust pipe mouth area is easy to carry droplets and roll them out, causing a decrease in separation efficiency; (3) the high strength of turbulence pulse at mouth area of vent and drainage is easy to break the droplets and decrease their diameter, which affects the separation efficiency. The above research results lay the foundation for the structure optimization and the improvement of separation properties of axial guide vane cyclone gas-liquid separator.

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A Downhole Hydrocyclone for the Recovery of Natural Gas Hydrates and Desanding: The CFD Simulation of the Flow Field and Separation Performance

Energies ◽

10.3390/en12173257 ◽

2019 ◽

Vol 12 (17) ◽

pp. 3257

Author(s):

Shunzuo Qiu ◽

Guorong Wang ◽

Leizhen Wang ◽

Xing Fang

Keyword(s):

Flow Field ◽

Removal Efficiency ◽

Separation Efficiency ◽

Solid Phase ◽

Short Circuit ◽

Tangential Velocity ◽

Separation Performance ◽

Volume Distribution ◽

Recovery Efficiency ◽

And Performance

The application of a hydrocyclone to recycle NGH and desand during NGH exploitation is a novel idea. The flow field and performance of this hydrocyclone is in the frontier of the research in this field and is unclear so far. This research aimed to reveal the flow field characteristics and performance of NGH downhole hydrocyclones. In this paper, flow field, solid phase particle volume distribution and separation efficiency were investigated according to the two objectives of NGH recovery efficiency and sand removal efficiency with different inlet velocities by computational fluid simulations (CFD)-FLUENT software. The results show that the short circuit flow contributed to the recovery of NGH. Axial velocity is a decisive factor in balancing the two objectives of NGH recovery efficiency and sand removal efficiency. In addition, the same as those in traditional hydrocyclones, the static pressure, tangential velocity and turbulence intensity play key roles in separation performance, hydrocyclone performance can be improved by increasing the inlet velocity. On the other hand, most separation efficiencies were greater than 80%, when the particle size was larger than 15 µm, and the differential pressure was less than 0.6 MPa. Therefore, all the above results confirm that hydrocyclone has good performance in NGH exploitation, and the basis of its structural design and optimization are provided.

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The Comparison with Numerical Simulation Results of Steam-Water Flow Field and Experimental Data for Car Exhaust Pipe

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.187.570 ◽

2011 ◽

Vol 187 ◽

pp. 570-574

Author(s):

Qing Guo Liu ◽

Yan Ma ◽

Chun Mei Yang

Keyword(s):

Experimental Data ◽

Numerical Simulation ◽

Flow Field ◽

Separation Efficiency ◽

Tangential Velocity ◽

Exhaust Pipe ◽

Two Phase ◽

Car Exhaust ◽

Simulation Results ◽

The Relationship

In this paper, the physical model for flow field of exhaust pipe has been established on the condition of a liquid-gas exhaust pipe from cars using ethanol gasoline. The numerical simulation results for internal flow field of car exhaust pipe are compared with the experimental data. It is showed that the outside free vortex tangential velocity and axial velocity of single-phase flow field have been simulated better. It is indicated in the simulation of separation process of steam-water two-phase: The relative error, comparing the relationship between flow and separation efficiency with measured of that is less than 7%, and the same to 15%, comparing the relationship between flow and separation ratio with measured of that. Thereby, it is confirmed correctly for the mathematical model founded for numerical calculation and the algorithm selected.

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Analysis of Gas Dynamics in a Rotating Disk Cavity

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.86.893 ◽

2011 ◽

Vol 86 ◽

pp. 893-897

Author(s):

Yang Liu ◽

Yong Hong Zhang ◽

Guo Ding Chen ◽

Ran Wan

Keyword(s):

Flow Field ◽

Gas Flow ◽

Radial Direction ◽

Fluid Dynamic ◽

Tangential Velocity ◽

Rotating Disk ◽

Flow State ◽

The Impact ◽

Gas Medium ◽

Gas Flow Field

A fundamental study has been performed to analysis the fluid dynamic characteristics of the gas medium in a rotating disk cavity through the commercial software CFX11.0. This paper aims to discuss the impact of the speed of rotating disk, axial and radial size and parietal lubricant film velocity and other factors on the gas flow state in cavity. Several conclusions have been obtained: the speed of rotating disk has a great impact on velocity distribution of gas flow field; the dimensionless tangential velocity of the gas medium decreases along the radial direction, and with the speed increasing, it shows a certain regularity; Dimensionless radial velocity decreases along the radial direction, and the speed of rotating disk nearly has no influence on this; The shear stress distribution along the radial direction and the distribution of tangential velocity have similar regularity; the impact of disk cavity height on the distribution of the tangential velocity along radial direction in the gas flow field is much more obvious than the impact of disk cavity width.

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