Measurement and Numerical Simulation of Particle Velocity in Cold Spraying

2006 ◽  
Vol 15 (4) ◽  
pp. 559-562 ◽  
Author(s):  
Wen-Ya Li ◽  
Chang-Jiu Li ◽  
Hong-Tao Wang ◽  
Cheng-Xin Li ◽  
Hee-Seon Bang
Keyword(s):  
Numerical Simulation ◽  
Particle Velocity ◽  
Cold Spraying

Numerical Simulation of Particulate Jet Generated by Free Falling Particles

2003 ◽  
Author(s):  
Tomomi Uchiyama
Keyword(s):  
Numerical Simulation ◽  
Particle Velocity ◽  
Single Particle ◽  
Maximum Velocity ◽  
Vortex Method ◽  
Solid Particles ◽  
Airflow Rate ◽  
Two Dimensional ◽  
Free Falling ◽  
Free Turbulent Flow

This paper is concerned with the numerical simulation of the particulate jet generated by solid particles falling from a slit orifice into an unbounded quiescent air. A two-dimensional vortex method, proposed for the analysis of particle-laden free turbulent flow in prior papers, is employed for the simulation. The falling particles induce complicated airflow involving eddies with a wide variety of scales. The air takes its maximum velocity at the jet centerline. The particle velocity is higher than the free falling velocity of a single particle. The effects of the diameter and density of the particle on the flow are investigated. The entrained airflow rate is favorably compared with the value predicted by an analytical model.

Numerical Simulation for the Damping Effect of Empty Holes on Blasting Vibration

2014 ◽  
Vol 936 ◽  
pp. 1490-1495 ◽  
Author(s):  
Kai Fang Bian ◽  
Hai Bo Li ◽  
Ya Qun Liu
Keyword(s):  
Numerical Simulation ◽  
Particle Velocity ◽  
Blast Hole ◽  
Discrete Element ◽  
Blasting Vibration ◽  
Two Dimensional ◽  
Monitoring Point ◽  
Damping Effect ◽  
Practical Engineering ◽  
Element Program

The two-dimensional discrete element program (UDEC) is applied to simulate the dampi- ng effect of empty holes on blasting vibration. The results show that the peak particle velocity of monitoring point on the condition that there are empty holes between monitoring point and blast hole is less than that without empty holes. The factors which have impact on cushioning effect, such as the depth of empty hole, the diameter of empty hole, the distance between empty hole and blast hole and the rows of empty hole, are investigated numerically. It is found that the depth of empty hole has dominated influence on the damping effect and the damping effect on blasting vibration strengthens with the increment of the depth. The diameter of empty hole and the distance between empty hole and blast hole have slight influence on the damping effect. The increment of rows of empty hole can enhance the damping effect on blasting vibration as well. The results in the present study may provide a reference for the application of empty hole to reduce the blasting vibration in practical engineering.

scholarly journals Study on the Growth of Holes in Cold Spraying via Numerical Simulation and Experimental Methods

Coatings ◽  
2016 ◽  
Vol 7 (1) ◽  
pp. 2 ◽  
Author(s):  
Guosheng Huang ◽  
Hongren Wang ◽  
Xiangbo Li ◽  
Lukuo Xing
Keyword(s):  
Numerical Simulation ◽  
Cold Spraying ◽  
Experimental Methods

Numerical Simulation of Gas-Particle Two Phase Flow in the Process of Cold Spraying Aluminum Zinc-Base Alloy Powder

2010 ◽  
Vol 37-38 ◽  
pp. 735-738 ◽  
Author(s):  
Chuan Shao Liu ◽  
Jiang Wei Cheng ◽  
Jian Xin Zheng
Keyword(s):  
Flow Field ◽  
Cold Spray ◽  
Particle Velocity ◽  
Axial Velocity ◽  
Base Alloy ◽  
Great Influence ◽  
Particle Diameter ◽  
Small Diameter ◽  
Cold Spraying ◽  
Two Phase

The gas velocity and particle velocity in and out of the nozzle have great influence on the coating effect in the process of cold spray. An axis-symmetric two-dimensional mathematical model was presented to study the flow field in and out of cold spray nozzle, and the effect of different pressure, temperature, spraying distance and particle diameter on gas axial velocity and particle velocity were researched. The simulation results showed that the gas axial velocity and particle velocity increased when the gas pressure and temperature were increased, spray distance had little effect on the flow field in the nozzle, and small diameter particle was more easily accelerated.

scholarly journals Statistical Method for Tracing Hydraulic Fracture Front Without Evaluation of the Normal

2018 ◽  
Vol 7 (4.26) ◽  
pp. 274 ◽  
Author(s):  
A. D. Stepanov
Keyword(s):  
Numerical Simulation ◽  
Particle Velocity ◽  
Hydraulic Fracture ◽  
Fluid Velocity ◽  
Type Equation ◽  
Mesh Size ◽  
Propagation Speed ◽  
Front Propagation ◽  
Hydraulic Fractures ◽  
Tangent Component

In numerical simulation of hydraulic fracture propagation, tangent component of the fluid velocity generally considered to be neglected near the crack front. Then Reynolds transport theorem yields that the limit of the particle velocity coincides with the vector of the front propagation speed. We use this fact in combination with the Poiseuille-type equation, which implies that the particle velocity is always collinear to pressure gradient. We show that this specific feature of the hydraulic fracture problem may serve to simplify tracing the front propagation. The latter may be traced without explicit evaluation of the normal to the front, which is needed in conventional applications of the theory of propagating interfaces. Numerical experiments confirm that, despite huge errors in pressure and even greater errors in its gradient, the propagation speed, statistically averaged over a distance of a mesh size, is found quite accurate. We conclude that suggested method may simplify numerical simulation of hydraulic fractures driven by Newtonian and non-Newtonian fluids. 

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