scholarly journals Pressure Distribution around the Melt Delivery Tube for a Confined-type Gas Atomization Nozzle

1996 ◽  
Vol 82 (8) ◽  
pp. 665-670 ◽  
Author(s):  
Tadashi FUKUDA ◽  
Mutsuo NAKANISHI ◽  
Toshihiko KUBO
Keyword(s):  
Pressure Distribution ◽  
Gas Atomization ◽  
Delivery Tube ◽  
Atomization Nozzle

Confined Gas Atomization: The Role of the Melt Delivery Tube in Particle Size Control

1986 ◽  
Vol 80 ◽  
Author(s):  
R. V. Raman
Keyword(s):  
Unique Feature ◽  
Size Control ◽  
Lower Surface ◽  
Spherical Particles ◽  
Gas Atomization ◽  
Reactive Elements ◽  
Delivery Tube ◽  
Atomization Process ◽  
Rapidly Solidified

AbstractGas atomization is one of the key processes used for the production of rapidly solidified materials. The unique feature of the gas atomization process is its capability to form spherical powders of multicomponent alloys containing reactive elements. Spherically shaped powder is specified in the secondary processing operations used in a number of applications. This requirement has resulted from the higher flow rate, better packing density, and lower surface area obtained in spherical particles compared to irregularly shaped particles.

Pressure build-up at the metal delivery tube orifice in ultrasonic gas atomization

1988 ◽  
Vol 23 (7) ◽  
pp. 2457-2463 ◽  
Author(s):  
J. C. Baram ◽  
M. K. Veistinen ◽  
E. J. Lavernia ◽  
M. Abinante ◽  
N. J. Grant
Keyword(s):  
Gas Atomization ◽  
Delivery Tube ◽  
Ultrasonic Gas Atomization ◽  
Metal Delivery

Development of a Swirl Nozzle for Powder Technology

2013 ◽  
Author(s):  
Mehmet Alper Sofuoglu ◽  
Murat Erbas ◽  
Ibrahim Uslan ◽  
Atilla Biyikoglu
Keyword(s):  
Lower Cost ◽  
Nozzle Geometry ◽  
Design Parameters ◽  
Maximum Pressure ◽  
Pressure Data ◽  
Delivery Tube ◽  
Second Stage ◽  
Flow Through ◽  
Two Stages ◽  
Atomization Nozzle

In this study, a gas atomization nozzle for metal powder production has been designed and modeled numerically. The design has been performed in two stages. At the first stage of the design, the size and geometry of the nozzle have been developed to obtain circulated flow through the nozzle as a pre-design. At the second stage, a parametrical analysis has been done using a CFD code. The geometry of the nozzle has been changed and the effect of geometric parameters was determined to find out the more efficient nozzle design parameters. Gas behavior at the nozzle exit and effect of the gas on the melt delivery tube tip has been investigated. Appropriate values for the investigated parameters have been determined to get maximum pressure in vacuum condition at the tip of the melt. The pressure observed at the melt delivery tube was compared with the experimental melt tip pressure data. These results suggest that the CFD solutions can be used in the design of the nozzle. Thus, the lower cost and shorter time would be possible to develop highly efficient nozzle geometry.

Direct Modeling of the Simultaneous Flow of Compressible Atomizing Gas Jets and a Weakly Compressible Liquid Intermetallic Stream During Gas Atomization

2008 ◽  
Vol 1128 ◽  
Author(s):  
Mingming Tong ◽  
David J. Browne
Keyword(s):  
Gas Flow ◽  
Compressible Liquid ◽  
Gas Atomization ◽  
Delivery Tube ◽  
Argon Gas ◽  
Gas Jets ◽  
2D Simulation ◽  
Weakly Compressible ◽  
Model Predictions ◽  
Direct Modeling

AbstractThe authors have developed a new atomization model enabling direct numerical simulation of the simultaneous flow of compressible atomizing gas jets and a weakly compressible liquid metal stream. It has been used to simulate the atomization of a Ni-50wt.%Al melt stream by argon gas jets in a closed-coupled atomizer. The 2D simulation results show that the presence of the liquid intermetallic stream significantly influences the field variables, particularly the aspiration pressure. At the gas plenum pressure used, the gas nozzles are choked and hence the gas flow upstream of the tip of the liquid delivery tube is not influenced by the presence of the liquid intermetallic stream, whereas the downstream gas flow is affected. Significant differences between model predictions assuming either incompressible or compressible gas are reported. Besides the atomization of liquid intermetallic stream by argon gas, this unified atomization model is available for use to simulate a variety of different twin-fluid atomization processes.

Effects of the Delivery Tube Diameter on the Qualities of Cu-9.7Sn-0.2P Alloy Powder Produced by Gas Atomization

2018 ◽  
Vol 913 ◽  
pp. 3-10
Author(s):  
Yu Wan Cheng ◽  
Zhi Yu Xiao ◽  
Hai Ping Zou
Keyword(s):  
Particle Size ◽  
Alloy Powder ◽  
Cost Effective ◽  
Tube Diameter ◽  
Gas Atomization ◽  
Delivery Tube ◽  
Powder Characteristics ◽  
Powder Particles ◽  
Particle Size And Shape ◽  
Dendritic Structures

Gas atomization is one of the most cost-effective methods for preparing spherical powders. The Cu-9.7Sn-0.2P alloy powder for 3D printing was prepared by a self-developed double nozzle gas atomization technique with different deliver tube diameters, and the particle size and shape of the powder were characterized. Results show that the powder particles are mostly nearly spherical, mixed with a few irregular powders. The average O. Bluntness of the powders are 60~70%, the average Outgrowths are lower than 18%. The deliver tube diameter affects the powder characteristics directly. The increase of the diameter increases the particle size of the powder and reduces the sphericity. At the same time, the adhesion of the satellite powder decreases, the flowability becomes better and the oxygen content drop. The surface and internal structure of the powder are mainly cellular and dendritic structures.

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