Numerical Study of Oil-Water Two Phase Separation in Hydrocyclone

2011 ◽  
Vol 339 ◽  
pp. 543-546 ◽  
Author(s):  
Fu Lun Zhang ◽  
Song Sheng Deng ◽  
Pan Feng Zhang
Keyword(s):  
Phase Separation ◽  
Volume Fraction ◽  
Numerical Study ◽  
Reynolds Stress Model ◽  
Separation Process ◽  
Two Phase ◽  
Water Separation ◽  
Phase Volume Fraction ◽  
Oil Water ◽  
Two Phases

This paper presents a numerical study of the oil-water two phase flow in hydrocyclone. Oil-water two phase separation was simulated by using Reynolds Stress Model and Mixer model of multi-phase models. The oil-water separation process, oil-phase volume fraction distribution, and trajectory about the water-oil two phase liquid flowing within hydrocyclone were obtained. The study show that the separation of water-oil two phases is mainly in the swirl-chamber and cone section in hydrocyclone, however, the cylindrical section plays an inessential role in stabilizing the flow field during separation process.

A Numerical Study of Flow Field and Oil Water Separation in Vertical Deadlegs

2011 ◽  
Vol 121-126 ◽  
pp. 2465-2470
Author(s):  
Kuang Ding ◽  
Hong Wu Zhu ◽  
Jin Ya Zhang ◽  
Chuan Wang ◽  
Jian Sheng Hao
Keyword(s):  
Volume Fraction ◽  
Numerical Study ◽  
Water Concentration ◽  
Stagnant Zone ◽  
Complex Flow ◽  
Water Separation ◽  
Main Pipe ◽  
Oil Water Separation ◽  
Flow Intensity ◽  
Oil Water

Deadleg is a kind of blind pipe connected with a main pipe used for fluid transportation, which has distinct flow characteristics. This work aims to investigate the complex flow, oil/water separation and the relation between fluid flow and water concentration of a vertical deadleg. The investigation was based on the solution of algebraic slip mixture model, which calculated the continuity and momentum equations for the mixture of oil and water, and solved the volume fraction equation for the secondary phase. The computed results indicated that the mixing zone of the deadleg consists of two circulation vortexes and the whole mixing length depends on the inlet flow intensity. Furthermore, distinct oil/water stratification forms in the stagnant zone, and the maximum water volumetric concentration is related to the length of stagnant zone and also influenced by the flow intensity of the main pipe, which could increase from 25% to 72% with inlet velocity ranges from 0.75m/s to 5m/s.

scholarly journals Numerical Study on an Interface Compression Method for the Volume of Fluid Approach

Fluids ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 80
Author(s):  
Yuria Okagaki ◽  
Taisuke Yonomoto ◽  
Masahiro Ishigaki ◽  
Yoshiyasu Hirose
Keyword(s):  
Linear Theory ◽  
Volume Fraction ◽  
Numerical Study ◽  
Volume Of Fluid ◽  
Interfacial Wave ◽  
Validation Process ◽  
Two Phase ◽  
Numerical Diffusion ◽  
Mesh Resolution ◽  
Water Reactors

Many thermohydraulic issues about the safety of light water reactors are related to complicated two-phase flow phenomena. In these phenomena, computational fluid dynamics (CFD) analysis using the volume of fluid (VOF) method causes numerical diffusion generated by the first-order upwind scheme used in the convection term of the volume fraction equation. Thus, in this study, we focused on an interface compression (IC) method for such a VOF approach; this technique prevents numerical diffusion issues and maintains boundedness and conservation with negative diffusion. First, on a sufficiently high mesh resolution and without the IC method, the validation process was considered by comparing the amplitude growth of the interfacial wave between a two-dimensional gas sheet and a quiescent liquid using the linear theory. The disturbance growth rates were consistent with the linear theory, and the validation process was considered appropriate. Then, this validation process confirmed the effects of the IC method on numerical diffusion, and we derived the optimum value of the IC coefficient, which is the parameter that controls the numerical diffusion.

Transmission Electron Microscopy (TEM) Observations of Phase-Separations of Gamma-Prime Precipitates in Ni-Al-Fe and Ni-Si-Fe Ternary Alloys

2007 ◽  
Vol 26-28 ◽  
pp. 1311-1314 ◽  
Author(s):  
M. Senga ◽  
H. Kumagai ◽  
Tomokazu Moritani ◽  
Minoru Doi
Keyword(s):  
Phase Separation ◽  
Volume Fraction ◽  
Heating Temperature ◽  
Ternary Alloys ◽  
Phase System ◽  
Precipitate Phase ◽  
Two Phase ◽  
Gamma Prime ◽  
Transmission Electron ◽  
The Difference

In Ni-13.0at%Si-3.1at%Fe alloy, when γ/γ’ two-phase microstructure formed at 1123 K is isothermally heated at 923 K which is lower than the temperature where the initial γ/γ’ microstructure forms, the phase-separation of γ/γ’ precipitate phase occurs and γ particles newly appear in each cuboidal γ’ precipitate. While in Ni-10.2at%Al-10.8at%Fe alloy, when γ/γ’ two-phase microstructure formed at 1023 K is isothermally heated at 1123 K which is higher than the temperature where the initial γ/γ’ microstructure forms, the phase-separation of γ’ precipitate phase takes place and γ particles newly appear in each cuboidal γ’ precipitate. Such appearance of new γ particles in γ’ precipitates can be explained by the difference in the volume fraction of γ phase that should exist in the γ/γ’ two-phase system depending on the heating temperature.

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