scholarly journals Experimental Research and Numerical Simulation on Gas-Liquid Separation Performance at High Gas Void Fraction of Helically Coiled Tube Separator

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Yongxue Zhang ◽  
Chan Guo ◽  
Hucan Hou ◽  
Guomin Xue
Keyword(s):  
Numerical Simulation ◽  
Pressure Drop ◽  
Void Fraction ◽  
Separation Efficiency ◽  
Separation Performance ◽  
Liquid Separation ◽  
Inlet Velocity ◽  
Coiled Tube ◽  
Helically Coiled Tube ◽  
Gas Void Fraction

The industrial removal process of the light hydrocarbon and water from wet natural gas can be simulated in laboratory with the independently designed helically coiled tube gas-liquid separator. Experiment and numerical simulation are combined to analyze the influences of various inlet velocities and gas void fractions on the gas-liquid separation efficiency and pressure-drop between the inlet and outlet of the helically coiled tube. The results show that, at the inlet velocity of 4 m/s to 18 m/s and the gas void fraction of 88% to 97% for the gas-liquid mixture, the gas-liquid separation efficiency increases at the beginning and then decreases with increasing inlet velocity. Afterwards there is another increasing trend again. The gradient of pressure-drop increases slowly and then fast with the increasing inlet velocity. On the other hand, the gas-liquid separation efficiency first increases with the gas void fraction and then shows a decreasing trend while the pressure-drop keeps falling down with the gas void fraction increasing. Above all the optimal operating parameters of the helically coiled tube separator are inlet velocity of 13 m/s and gas void fraction of 93%, and the separation efficiency and pressure-drop are 95.2% and 0.3 MPa, respectively.

Experimental Study on Two Different Gas-Liquid Separators Under Different Flow Patterns

2020 ◽  
Author(s):  
Xiaobo Zeng ◽  
Changqi Yan ◽  
Guangming Fan ◽  
Jie Cheng ◽  
Junxiu Xu ◽  
...  
Keyword(s):  
Void Fraction ◽  
Slug Flow ◽  
High Efficiency ◽  
Separation Efficiency ◽  
Experimental System ◽  
Flow Patterns ◽  
Separation Performance ◽  
Wide Range ◽  
Churn Flow ◽  
Gas Void Fraction

Abstract Gas-liquid separation is widely used in many fields, such as nuclear energy and petroleum resources. And the gas-liquid mixture separated gradually shows the characteristic of wide range of gas void fraction and variable flow patterns. However, the current separators only suit for narrow range of gas void fraction or single flow patterns. In this research, two different new type separators using centrifugal technology were designed and an experimental system was constructed to test the two separators using dry air and water under different flow patterns, including bubble, slug and churn flow. One was called inline separator consisting of three swirls and another was called double-layer cylinder separator composed of a central tube, a swirl and an outer tube. The results show that the separation performance of the inline separator was sensitive to flow patterns and the two-layer cylinder separator keeps high efficiency in different flow patterns. In bubble flow and slug flow patterns, the two separators kept high efficiency, while the oscillation of the gas core in the inline separator aggravated under slug flow condition. When increasing the gas void fraction, the turbulence of the churn flow led to the diameter of the gas core change drastically and reduce separation efficiency significantly.

scholarly journals Influence of Vortex Finder Structure on Separation Performance of Double-Overflow Three-Product Hydrocyclones

Separations ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 79
Author(s):  
Yuekan Zhang ◽  
Jiangbo Ge ◽  
Lanyue Jiang ◽  
Hui Wang ◽  
Junru Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Experimental Research ◽  
Separation Efficiency ◽  
Structural Parameters ◽  
Separation Performance ◽  
Insertion Depth ◽  
Flow Field Characteristics ◽  
Vortex Finder ◽  
Fine Classification

In view of the difficulty of traditional hydrocyclones to meet the requirements of fine classification, a double-overflow three-product (internal overflow, external overflow and underflow) hydrocyclone was designed in this study. Numerical simulation and experimental research methods were used to investigate the effects of double-overflow flow field characteristics and structural parameters (i.e., internal vortex finder diameter and insertion depth) on separation performance. The research results showed that the larger the diameter of the internal vortex finder, the greater the overflow yield and the larger the cut size. The finest internal overflow product can be obtained when the internal vortex finder is 30 mm longer than the external vortex finder. The separation efficiency is highest when the internal vortex finder is 30 mm shorter than the external vortex finder.

Three Dimensional Numerical Simulation of Solid-Liquid Separation of Horizontal Spiral Sedimentation Centrifuge

2013 ◽  
Vol 634-638 ◽  
pp. 1655-1658
Author(s):  
Qiu Bo Huang ◽  
Qing Jie Liu ◽  
Sheng Ju Zang
Keyword(s):  
Numerical Simulation ◽  
Separation Efficiency ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Liquid Separation ◽  
Sedimentation Centrifuge ◽  
Fluent Software ◽  
Solid Liquid ◽  
Solid Liquid Separation ◽  
The Relationship

The separation efficiency, separation factor, flow and other parameters are closely related in terms of horizontal spiral sedimentation centrifuge. This article takes lwb350 horizontal spiral sedimentation centrifuge for example, with the help of FLUENT software, the relationship among the separation efficiency and the working speed as well as feed flow is analyzed through the numerical simulation of solid-liquid separation, which can provide reference for the application of simulation analysis and research on properties of spiral centrifuge.

The Structure Design and Numerical Simulation Research on Downhole Hydrocyclone Desander

2014 ◽  
Vol 933 ◽  
pp. 434-438
Author(s):  
Yue Juan Yan ◽  
Yan Xu Shang ◽  
Zun Ce Wang ◽  
Mi Tian ◽  
Yue Wang
Keyword(s):  
Numerical Simulation ◽  
Pressure Drop ◽  
Separation Efficiency ◽  
Structural Parameters ◽  
Production Capacity ◽  
Geometrical Model ◽  
Structure Design ◽  
Operating Conditions ◽  
Structure Parameters ◽  
Effect Of Structure

A new downhole hydrocyclone desander with spiral deflector and cyclone cone was designed to apply in downhole solid-liquid separation according to the downhole operating conditions, such as a high produced liquid viscosity, narrow radial working space and closed bottom flow, etc. The structure parameters were designed primarily based on the effect of structure size on pressure drop, production capacity and separation efficiency. Numerical simulation was conducted on the base of Mixture model and Reynolds stress (RSM) turbulent model by Fluent CFD software. The geometrical model of single inlet and single outlet was established. The simulation calculations were carried out to analysis the effect of structure parameters change on separation efficiency and pressure drop, obtained the influence rules. The optimum structural parameters were confirmed. The numerical simulation results lay the foundation for the next experimental study.

scholarly journals Investigation on separation performance of vane-type gas-liquid tube separator

2020 ◽  
Vol 26 (3) ◽  
pp. 227-236 ◽  
Author(s):  
Jun Niu ◽  
Shuo Liu ◽  
Jing-Yu Xu
Keyword(s):  
Numerical Simulation ◽  
Flow Rate ◽  
Electrical Resistance ◽  
Phase Distribution ◽  
Separation Efficiency ◽  
Separation Performance ◽  
Multiphase Model ◽  
Electrical Resistance Tomography ◽  
Mixture Density ◽  
Liquid Separator

In this work, gas phase distribution characteristic and separation performance of a new vane-type gas-liquid separator were carefully investigated using electrical resistance tomography and numerical simulation. The diameter of the separator was 100 mm and the flow rate ranges from 12.0 to 23.0 m3/h. The gas flow rate ranges from 1.2 to 4.0 m3/h. In the experiment, electrical resistance tomography was applied to test section void fraction distribution. Coriolis mass flow meter was applied to obtain separation efficiency by testing separator exits mixture density. In the numerical simulation, full Eulerian multiphase model, together with RNG k-? turbulent model and dispersed phase zero equation models were applied. Results show that the vane-type gas-liquid separator's performance is influenced by gas core size. The separator performs well in all the cases, considering separation efficiency is over 85%, and achieves nearly 100% through adjustment of split ratio. All these findings are beneficial for vane-type gas-liquid separator design and optimization.

scholarly journals Energetic and Exergetic Assessment of Spiral Heat Exchanger Using Mineral and Oxide Mineral Oil Nanofluid

2021 ◽  
Vol 39 (2) ◽  
pp. 531-540
Author(s):  
Khalid Faisal Sultan ◽  
Mohammed Hassan Jabal ◽  
Ameer Abed Jaddoa
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Pressure Drop ◽  
Transfer Coefficient ◽  
Base Fluid ◽  
Exergy Efficiency ◽  
Exergy Destruction ◽  
Coiled Tube ◽  
Helically Coiled Tube ◽  
The Heat Transfer Coefficient

This paper presents an experimental analysis on the heat transfer and pressure drop enhancement of oil nanofluid flow. In this analysis, the first method has used the helically coiled tube and shell, the oil nanofluids were employed instead of the base fluid (oil) in the second process. the two techniques were used to improve the heat transfer and pressure drop. Nanofluid oil concentrations utilized within range from 1 to 5 percent vol. This paper applied two forms of nanoparticles: copper (Cu (20 nm)) and zirconium oxide (ZrO2 (40 nm)) and base fluid (oil). The influence on the heat transfer coefficient for different factors such as the flow number of Reynolds, the temperature of the nanofluid oil, the concentration and shape of the nanoparticle, and the pressure gradient of the flow have examined. The results indicated that the value of a 40.35 percent in the heat transfer coefficient for Cu + oil and 28.42 percent for ZrO2 + oil increased compared with the base fluid (oil) at 5 percent vol concentration. Using oil nanofluids (Cu, ZrO2 – oil) instead of the base fluid (oil) led to increasing in the heat transfer coefficient and decreasing the pressure. In addition, the result showed that the heat transfer efficiency has enhanced using the helically coiled tube and shell, as well as increasing in the pressure drop was due to the curvature of the tube. Baes on the relationship between viscosity and shear intensity, the oil nanofluid behaviors were similar to the standard Newtonian fluids. Moreover, the related flow and heat transfer methods are used to present the output index. The exergy inflow, exergy destruction and exergy efficiency of oil nanofluid (Cu +oil) were greater than the oil nanofluid (ZrO2 +oil) and oil. The exergy inflow, exergy destruction, and exergy efficiency for the two type of oil nanofluid increased with increasing of nanoparticles concentration.

Sign in / Sign up

Export Citation Format

Share Document