Erosion Pattern of Twisted Blades by Particle Laden Flows

1983 ◽  
Vol 105 (4) ◽  
pp. 839-843 ◽  
Author(s):  
A. Hamed ◽  
S. Fowler
Keyword(s):  
Statistical Methods ◽  
Material Removal ◽  
Particle Trajectory ◽  
Particle Sizes ◽  
Trajectory Calculations ◽  
Particle Laden Flows ◽  
Turbomachine Blade

This paper presents the results of a study to predict turbomachine blade erosion by particle laden flows. Using statistical methods, this work combines particle trajectory calculations with experimental erosion data to determine the erosion of blades. The results of the calculations are presented to show the different patterns of blade material removal distribution over the surface of twisted stator blades for different particle sizes.

Erosion Pattern of Twisted Blades by Particle Laden Flows

1983 ◽  
Author(s):  
A. Hamed ◽  
S. Fowler
Keyword(s):  
Statistical Methods ◽  
Material Removal ◽  
Particle Trajectory ◽  
Particle Sizes ◽  
Trajectory Calculations ◽  
Particle Laden Flows ◽  
Turbomachine Blade

This paper presents the results of a study to predict turbomachine blade erosion by particle laden flows. Using statistical methods, this work combines particle trajectory calculations with experimental erosion data to determine the erosion of blades. The results of the calculations are presented to show the different patterns of blade material removal distribution over the surface of twisted stator blades for different particle sizes.

Particle trajectory calculations using finite element electromagnetic field maps

1988 ◽  
Vol 24 (6) ◽  
pp. 3126-3128 ◽  
Author(s):  
M.D.N. Lunney ◽  
R.B. Moore ◽  
J.P. Webb ◽  
B. Forghani
Keyword(s):  
Finite Element ◽  
Electromagnetic Field ◽  
Particle Trajectory ◽  
Trajectory Calculations

On the Lapping Mechanism of Optical Fiber End-Surfaces Using Fixed Diamond Abrasive Films

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
JiAn Duan ◽  
DeFu Liu
Keyword(s):  
Particle Size ◽  
Optical Fiber ◽  
Material Removal ◽  
Abrasive Particle ◽  
Particle Sizes ◽  
Material Removal Mechanisms ◽  
Ductile Mode ◽  
Deformed Layer ◽  
Diamond Abrasive ◽  
Scanning Electron

The purpose of this paper is to reveal material removal mechanisms of optical fiber end-surface in lapping processes. The lapping process experiments are conducted using fixed diamond abrasive lapping films with various particle sizes of 6 μm, 3 μm, 1 μm, and 0.5 μm. The micrographs of the optical fiber end-surfaces are observed using a scanning electron microscope. The experimental results show that there exist three material removal modes in the lapping processes: brittle fracture mode, semibrittle and semiductile mode, and ductile mode. These modes are mainly controlled by abrasive particle size, and there appears a brittle-ductile transition’s critical point when lapping films with a particle size of 3 μm are used to lap optical fiber end-surfaces. An interpretation is proposed for the formation mechanism of the plastic deformed layer on the optical fiber end-surfaces.

scholarly journals Energetic ion injection and formation of the storm-time symmetric ring current

2006 ◽  
Vol 24 (12) ◽  
pp. 3547-3556 ◽  
Author(s):  
L. Xie ◽  
Z. Y. Pu ◽  
X. Z. Zhou ◽  
S. Y. Fu ◽  
Q.-G. Zong ◽  
...  
Keyword(s):  
Electric Field ◽  
Ring Current ◽  
Particle Trajectory ◽  
Three Dimensional ◽  
Extensive Study ◽  
Current Injection ◽  
Ion Injection ◽  
Convection Electric Field ◽  
Trajectory Calculations ◽  
Current Region

Abstract. An extensive study of ring current injection and intensification of the storm-time ring current is conducted with three-dimensional (3-D) test particle trajectory calculations (TPTCs). The TPTCs reveal more accurately the process of ring current injection, with the main results being the following: (1) an intense convection electric field can effectively energize and inject plasma sheet particles into the ring current region within 1–3 h. (2) Injected ions often follow chaotic trajectories in non-adiabatic regions, which may have implications in storm and ring current physics. (3) The shielding electric field, which arises as a consequence of enhanced convection and co-exists with the injection and convection electric field, may cause the original open trajectories of injected ions with higher energy to change into closed ones, thus playing a role in the formation of the symmetric ring current.

Numerical Experiments on Solid Handling Pump

2006 ◽  
Author(s):  
Amit Gupta ◽  
J. T. Kshirsagar
Keyword(s):  
Particle Trajectory ◽  
Numerical Approach ◽  
Solid Particles ◽  
Particle Sizes ◽  
Water Pump ◽  
Clear Water ◽  
Actual Performance ◽  
Cluster Density ◽  
Performance Deterioration ◽  
Number Of Particles

Solid handling pumps are used in managing sewage and other solid materials that could flow along with the water or any other fluid. The design of solid handling pump components is also deviating significantly from clear water pump components. The flow passages need to be maintained to allow solid particles of specified sizes smoothly without any obstruction. This aspect of different design from conventional design causes performance deterioration of the pump. The laboratory testing of the solid handling pumps is normally carried out with clear water and a judgment is used based on experience about the deterioration in performance caused by solid particles (size and number of particles). The actual performance measurement with varying particle sizes and its cluster density is very rarely available. A case of solid handling pump is taken up for detail investigation using numerical approach. The preliminary analysis has been carried out with solid handling impeller with clear water as medium of flow. The solid particles are then injected with different sizes and number of solid. Both Eulerian and Langrangian multiphase flow (MPF) approach have been used to study the hydraulic performance deterioration and particle trajectory in the working pump. The paper describes the approaches used and discusses the results considering generally accepted behavior of solid handing pumps.

Mechanics of Polishing

1998 ◽  
Vol 65 (2) ◽  
pp. 410-416 ◽  
Author(s):  
V. H. Bulsara ◽  
Y. Ahn ◽  
S. Chandrasekar ◽  
T. N. Farris
Keyword(s):  
Particle Size ◽  
Material Removal ◽  
Indentation Hardness ◽  
Particle Sizes ◽  
Size Distributions ◽  
Polishing Process ◽  
Average Force ◽  
Abrasive Particles ◽  
Effect Of Particle Size ◽  
Micro Indentation

A model has been developed to determine the number and sizes of abrasive particles involved in material removal in polishing, and the forces acting on these particles. The effect of particle size on these parameters has been simulated for a range of particle sizes. It is shown that when polishing with abrasive powders having relatively broad size distributions, only a very small percentage of the particles are involved in material removal. Further, these particles are comprised of the larger particles occurring in the tail end of the particle size distribution. The average force on a particle is found to be in the range of 5–200 mN under typical polishing conditions, which is of the order of loads used in micro-indentation hardness testing. These predictions of the model are consistent with observations pertaining to polished surfaces and the polishing process.

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