Double vortex generators for increasing the separation efficiency of the air separator

Based on the aeroengine lubricating oil system test bench, this paper used a dimensional analysis method to establish a mathematical model for predicting the separation efficiency and resistance of a dynamic pressure oil-air separator suitable for engineering. The analysis of the multivariate nonlinear fitting error and the experimental data showed that the established separation efficiency and resistance model could accurately predict the separation and resistance performance of the dynamic pressure oil-air separator within a certain range; the average error of the four separation characteristic prediction models was 3.5%, and the maximum error was less than 16%. The model that was established by the least square method had the highest accuracy; the average error of the multivariate nonlinear fitting of the four resistance characteristic prediction models was less than 4%, and the maximum error was less than 15%, which could be used to predict the resistance performance of the separator. The applicable working condition of the model is lubricating oil flow rate 4.3~8.5 L/min and oil-air ratio 0.5~3.

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Experimental and 3D-CFD investigation on optimization of the air separator structural parameters for maximum separation efficiency

Separation Science and Technology ◽

10.1080/01496395.2016.1267755 ◽

2017 ◽

Vol 52 (5) ◽

pp. 903-929 ◽

Cited By ~ 5

Author(s):

Seyed Ehsan Rafiee ◽

M. M. Sadeghiazad

Keyword(s):

Separation Efficiency ◽

Structural Parameters ◽

Maximum Separation ◽

Air Separator

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Numerical Study on the Influence of Length-Diameter Ratio on the Performance of Dynamic Pressure Oil-Air Separator

International Journal of Chemical Engineering ◽

10.1155/2021/6649128 ◽

2021 ◽

Vol 2021 ◽

pp. 1-16

Author(s):

Xiaobin Zhang ◽

Xiaofeng Zhang ◽

Delin Gu ◽

Lei Lang ◽

Na Gao

Keyword(s):

Aspect Ratio ◽

Separation Efficiency ◽

Dynamic Pressure ◽

Diameter Ratio ◽

Operating Conditions ◽

Maximum Efficiency ◽

Separation Performance ◽

Cylinder Length ◽

Cylinder Diameter ◽

Air Separator

In order to study the separation characteristics of the aeroengine dynamic pressure oil-air separator, this paper uses the coupling method of PBM and CFD two-fluid model to study the influencing factors such as cylinder diameter, cylinder length, and other factors on the separator performance. The flow field structure, velocity, gas volume distribution, separation efficiency, and gas and liquid holdup rate in the separator under different operating conditions are analyzed. Combined with the analysis results of the cylinder diameter and the cylinder length, the influence law of length-diameter ratio on separation efficiency is summarized. The optimum length-to-diameter ratio that maximizes the separation performance of the separator is obtained in this research, which provides a reference for the design and improvement of the separator. The results show that, as the diameter of the cylinder increases, the separation efficiency increases first and then decreases. When dsep = 16 mm and dsep = 18 mm, the separator reaches its maximum efficiency, which is about 93%. With the increase of the cylinder length, the separation efficiency first increases and reaches the maximum when l2 = 90 mm and then decreases slowly. When the separator cylinder is either too long or too short, it will cause the separation performance to decrease. There is an optimal aspect ratio. There is an optimal aspect ratio, and the separation performance of the separator is the best when the aspect ratio is between 5 and 6.

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Applicability of electrodialysis to the separation of sodium acetate from synthetic alkaline hardwood extract

TAPPI Journal ◽

10.32964/tj14.11.695 ◽

2015 ◽

Vol 14 (11) ◽

pp. 695-708 ◽

Cited By ~ 3

Author(s):

RAVIKANT PATIL ◽

CHI TRUONG ◽

JOSEPH GENCO ◽

HEMANT PENDSE ◽

ADRIAAN VAN HEININGEN

Keyword(s):

Current Density ◽

Sodium Sulfate ◽

Sodium Acetate ◽

Separation Efficiency ◽

Feed Concentration ◽

Initial Concentration ◽

White Liquor ◽

Complete Extraction ◽

Electro Osmosis ◽

Preliminary Separation

Our objective was to develop a process for recovering acetyl groups from industrial northeast hardwood chips. Extraction experiments showed that the white liquor charge of 6% effective alkali at 50°C and liquor-to-wood ratio of 4:1 leads to the complete extraction of acetyl groups from industrial hardwood chips. Electrodialysis was assessed as a technique for separating and concentrating sodium acetate from synthetic hardwood extract. Preliminary separation experiments using dilute sodium acetate showed that the sodium acetate can be concentrated up to approximately 24% by weight from an initial concentration of about 2% by weight. The effects of current density, feed concentration, electro-osmosis, and osmosis on the separation of sodium acetate were evaluated. Finally, selectivity experiments were performed to study the effect of various components of the white liquor on the separation of sodium acetate. Fully oxidized synthetic white liquor was used in selectivity experiments to avoid deleterious effects of Na2S. Selectivity experiments using synthetic oxidized white liquor showed a significant decrease in the separation efficiency due to the presence of sodium hydroxide, sodium carbonate, and sodium sulfate in the synthetic extract.

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