Notice of Retraction: The analysis on the grass powder flow field in the impressing roller system

2011 ◽  
Author(s):  
Xiao-peng Huang ◽  
Jian-long Huang ◽  
Jing-feng Wu ◽  
Wei Zhang
Keyword(s):  
Flow Field ◽  
Powder Flow ◽  
Roller System ◽  
Powder Flow Field

Numerical simulation of powder flow field on coaxial powder nozzle in laser metal direct manufacturing

2010 ◽  
Vol 49 (9-12) ◽  
pp. 853-859 ◽  
Author(s):  
Anfeng Zhang ◽  
Dichen Li ◽  
Zhimin Zhou ◽  
Gangxian Zhu ◽  
Bingheng Lu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Powder Flow ◽  
Powder Flow Field

Numerical Simulation and Analysis of Coaxial Powder Feeding Flow during Laser Direct Deposition

2011 ◽  
Vol 88-89 ◽  
pp. 38-41
Author(s):  
Wei Zhang ◽  
Shu Qin Shi
Keyword(s):  
Flow Field ◽  
Molten Pool ◽  
Gas Flow ◽  
Calculation Model ◽  
Powder Flow ◽  
Flow Process ◽  
Forming Efficiency ◽  
And Performance ◽  
Powder Flow Field ◽  
Powder Feeding

Coaxial powder feeding with carrier gas is the key part of laser direct metal deposition (DMD) rapid prototyping system. The convergence of powder flow would greatly affect forming efficiency, precision and performance. Numerical calculation model of flow field was built and simulated in this paper. The results of simulation and analysis had shown that powder flow field was very complex. The flow process could be divided into two parts, converging process and dispersing process. The main influencing factors of convergence included powder feeding rate, carrier gas flow rate, and the distance from nozzle to molten pool. There was a convergent focus where utilization ratio of powder was maximum. So the distance from nozzle to molten pool must be adjusted to equal to convergent focus (1.5cm) during DMD.

Flow Field Simulation and Adjustable Structure Design on Laser Coaxial Powder Flow Nozzle

Applied laser ◽  
2013 ◽  
Vol 33 (6) ◽  
pp. 639-645
Author(s):  
伊鹏 Yi Peng ◽  
杨光辉 Yang Guanghui ◽  
范常峰 Fan Changfeng ◽  
谢江浩 Xie Jianghao
Keyword(s):  
Flow Field ◽  
Structure Design ◽  
Powder Flow ◽  
Flow Field Simulation ◽  
Field Simulation

Flow Field Simulation and Adjustable Structure Design on Laser Coaxial Powder Flow Nozzle

Applied laser ◽  
2013 ◽  
Vol 33 (6) ◽  
pp. 639-645
Author(s):  
伊鹏 Yi Peng ◽  
杨光辉 Yang Guanghui ◽  
范常峰 Fan Changfeng ◽  
谢江浩 Xie Jianghao
Keyword(s):  
Flow Field ◽  
Structure Design ◽  
Powder Flow ◽  
Flow Field Simulation ◽  
Field Simulation

Numerical Study of the Combined Free-Forced Convection and Mass Transfer Flow Past a Vertical Porous Plate in a Porous Medium with Heat Generation and Thermal Diffusion

2006 ◽  
Vol 11 (4) ◽  
pp. 331-343 ◽  
Author(s):  
M. S. Alam ◽  
M. M. Rahman ◽  
M. A. Samad
Keyword(s):  
Mass Transfer ◽  
Flow Field ◽  
Differential Equations ◽  
Forced Convection ◽  
Heat Generation ◽  
Numerical Study ◽  
Porous Plate ◽  
Integration Scheme ◽  
Suction Parameter ◽  
Transfer Flow

The problem of combined free-forced convection and mass transfer flow over a vertical porous flat plate, in presence of heat generation and thermaldiffusion, is studied numerically. The non-linear partial differential equations and their boundary conditions, describing the problem under consideration, are transformed into a system of ordinary differential equations by using usual similarity transformations. This system is solved numerically by applying Nachtsheim-Swigert shooting iteration technique together with Runge-Kutta sixth order integration scheme. The effects of suction parameter, heat generation parameter and Soret number are examined on the flow field of a hydrogen-air mixture as a non-chemical reacting fluid pair. The analysis of the obtained results showed that the flow field is significantly influenced by these parameters.

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