Degree of difficulty of separation for fluid flow-facilitated particle separation systems

1997 ◽  
Vol 90 (2) ◽  
pp. 169-172 ◽  
Author(s):  
Gangyi Feng ◽  
L.T. Fan
Keyword(s):  
Fluid Flow ◽  
Particle Separation ◽  
Separation Systems

Assessment of Scavenge Efficiency for a Helicopter Particle Separation System

2011 ◽  
Author(s):  
Leiyong Jiang ◽  
Michael Benner ◽  
Jeff Bird
Keyword(s):  
Shape Factor ◽  
Flow Characteristics ◽  
Particle Separation ◽  
Operating Conditions ◽  
Separation Mechanism ◽  
Separation System ◽  
Small Particles ◽  
Inlet Velocity ◽  
Separation Systems ◽  
Large Particles

The effectiveness of a typical helicopter particle separation system has been numerically assessed at practical operating conditions and sand environments for various scenarios. The particle separation mechanism and its limitation are revealed by the flow characteristics and particle trajectories in the flow-field. The separation-by-inertia concept is effective for removing large particles, but problematic for small particles of diameter (d) ≤ 36μm. The particle size, shape factor, and rebound characteristics exert substantial effects on particle scavenge efficiency. On the other hand, the effects of gravity, particle inlet velocity, inlet mass distribution, and engine operating conditions on scavenge efficiency are minor or limited for the configurations and operating conditions considered in the present study. In addition, a few suggestions for further investigation on engine particle separation systems are included.

Particle Separation Systems

2005 ◽  
pp. 7-1-7-55
Author(s):  
Hisao Makino ◽  
Hideto Yoshida ◽  
Chikao Kanaoka
Keyword(s):  
Particle Separation ◽  
Separation Systems

Assessment of Scavenge Efficiency for a Helicopter Particle Separation System

2012 ◽  
Vol 57 (2) ◽  
pp. 41-48 ◽  
Author(s):  
L.Y. Jiang ◽  
M. Benner ◽  
J. Bird
Keyword(s):  
Shape Factor ◽  
Particle Separation ◽  
Operating Conditions ◽  
Separation Mechanism ◽  
Separation System ◽  
Small Particles ◽  
Inlet Velocity ◽  
Separation Systems ◽  
Large Particles ◽  
Flow Field Characteristics

The effectiveness of a helicopter particle separation system has been numerically assessed at practical operating conditions and sand environments for various scenarios. The particle separation mechanism and its limitations are revealed by the predicted flow field characteristics and particle trajectories. The separation-by-inertia concept is effective for removing large particles, but problematic for small particles of diameter ≤36 μm for the configuration and operating conditions considered in the present study. It is also found that particle size, shape factor, and rebound characteristics exert substantial effects on particle scavenge efficiency. However, the effects of gravity, particle inlet velocity, inlet mass distribution, and engine-operating conditions on scavenge efficiency are minor or limited. Finally, a few suggestions for further investigation on engine particle separation systems are included.

CFD Study on Inner Fluid Flow of Novel Hydrocyclone

2013 ◽  
Vol 711 ◽  
pp. 338-343 ◽  
Author(s):  
Ruo Feng Song ◽  
Yong Teng Yang ◽  
Lei Zhao ◽  
Fang Fang
Keyword(s):  
Fluid Flow ◽  
Separation Efficiency ◽  
Particle Separation ◽  
Industrial Processes ◽  
Fluid Flow Rate ◽  
Rotating Blade ◽  
Blade Section ◽  
Separation Equipment ◽  
Solid Liquid ◽  
Solid Liquid Separation

Hydrocyclone has been increasingly used in mineral, food and chemical industrial processes as common solid-liquid separation equipment. Small-sized hydrocyclone is generally applied to separate fine particle which is hard to separate by conventional sized hydrocyclone. However, the separation efficiency could be reduced due to the limitations of inlet width and capacity in this case. A novel impeller hydrocyclone is designed to solve this problem, and the influences of impeller on inner fluid flow rate have been discussed by simulating fluid flow patterns using a common CFD software, FLUENT. The results show that increasing the speed of rotating blade section is an effective way to improve the particle separation efficiency due to the increase in centrifugal force.

Batch process particle separation using surface acoustic waves (SAW): integration of travelling and standing SAW

RSC Advances ◽  
2016 ◽  
Vol 6 (7) ◽  
pp. 5856-5864 ◽  
Author(s):  
Citsabehsan Devendran ◽  
Nipuna R. Gunasekara ◽  
David J. Collins ◽  
Adrian Neild
Keyword(s):  
Fluid Flow ◽  
Standing Wave ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Particle Separation ◽  
Batch Process ◽  
Acoustic Fields ◽  
Particle Sorting ◽  
System P

Acoustic fields are described incorporating travelling and standing wave components to perform size-deterministic particle sorting. This is achieved without the need for fluid flow allowing application to very small volumes in a batch-wise system.

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