scholarly journals Three-dimensional numerical simulation of the physical field distributions of RF thermal plasma

2021 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
◽  
◽  
Keyword(s):  
Numerical Simulation ◽  
Thermal Plasma ◽  
Three Dimensional ◽  
Physical Field ◽  
Field Distributions ◽  
Rf Thermal Plasma

3D Numerical Simulation of the Hollow Square-Typed Polymer Based on Gas-Assisted Extrusion Method

2016 ◽  
Vol 861 ◽  
pp. 189-194 ◽  
Author(s):  
Zhong Ren ◽  
Xing Yuan Huang
Keyword(s):  
Numerical Simulation ◽  
Pressure Drop ◽  
Three Dimensional ◽  
Physical Field ◽  
Extrudate Swell ◽  
Swell Ratio ◽  
Field Distributions ◽  
Extrusion Technology ◽  
Assisted Modes

According to the properties of hollow square-typed polymer extrudate, the three dimensional numerical simulation of hollow square-typed polymer extrudate based on gas-assisted extrusion technology was performed by using finite element method. Meanwhile, four different gas-assisted modes imposed on the outer and inner wall of hollow square-type extrudate were considered. The extrudate swell ratios and field distributions, such as pressure drop, velocities and normal stresses of four different gas-assisted modes were obtained and compared with each other. Research results show that the extrudate swell ratios and field distributions of different gas-assisted modes are completely different. For the mode of gas-assisted on the single wall, the extrudate swell or shrink phenomena are large due to the non-symmetric properties of field distributions. For the no gas-assisted mode, although the physical field values are large, the extrudate swell ratio is not large due to the interaction role of both walls. For the mode of gas-assisted on both walls, the physical field values, such as pressure drop, normal velocities and stresses are all diminished, and the extrudate swell phenomenon was completely eliminated.

scholarly journals Preparation of Spherical Alumina Powder by RF Thermal Plasma: Numerical Simulation and Experimentation

2018 ◽  
Vol 33 (5) ◽  
pp. 550
Author(s):  
CHEN Wen-Bo ◽  
CHEN Lun-Jiang ◽  
LIU Chuan-Dong ◽  
CHENG Chang-Ming ◽  
TONG Hong-Hui ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Thermal Plasma ◽  
Alumina Powder ◽  
Rf Thermal Plasma ◽  
Spherical Alumina

scholarly journals RF Thermal Plasma Synthesis of Ultrafine ZrB2-ZrC Composite Powders

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2497
Author(s):  
Liuyang Bai ◽  
Fangli Yuan ◽  
Zheng Fang ◽  
Qi Wang ◽  
Yuge Ouyang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Particle Size ◽  
Thermodynamic Analysis ◽  
Experimental Work ◽  
Thermal Plasma ◽  
Raw Materials ◽  
Synthesis Process ◽  
Plasma Synthesis ◽  
Composite Powders ◽  
Rf Thermal Plasma

Ultrafine ZrB2-ZrC composite powders were synthesized via a radiofrequency (RF) thermal plasma process. Numerical simulation and thermodynamic analysis were conducted to predict the synthesis process, and experimental work was performed accordingly to demonstrate its feasibility. The as-prepared samples were characterized by XRD, FESEM, particle size analyzer, nitrogen/oxygen analyzer, Hall flowmeter, and the Brunner-Emmet-Teller (BET) measurements. The thermodynamic analysis indicated that ZrB2 was preferentially generated, rather than ZrC, and numerical simulation revealed that the solid raw materials could disperse well in the gaseous reactants, and experimental work showed that free carbon particles were easily removed from the products and the elements of Zr, B, C, and O exhibited a uniform distribution. Finally, ZrB2-ZrC composite powders with a particle size of about 100 nm were obtained, the surface area of which was 32.15 m2/g and the apparent density was 0.57 g/cm3.

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