scholarly journals Numerical Study of Three-Dimensional Melt Flows during the TSSG Process of SiC Crystal for the Influence of Input Parameters of RF-Coils and an External Rotating Magnetic Field

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 111 ◽  
Author(s):  
Lei Wang ◽  
Yuto Takehara ◽  
Atsushi Sekimoto ◽  
Yasunori Okano ◽  
Toru Ujihara ◽  
...  

Three-dimensional numerical simulations were conducted for the Top-Seeded Solution Growth (TSSG) process of silicon carbide (SiC) crystals. We investigated the influence of coils frequency and peak current, and an applied rotating magnetic field (RMF) on the melt flow developing in this system. Numerical simulation results show that the Marangoni flow in the melt becomes stronger at higher coils frequencies due to the decreasing coils-induced electromagnetic field strength. Results also show that the use of external RMF may improve supersaturation uniformity along the seed if it is properly adjusted with respect to the coils-induced electromagnetic field strength. Furthermore, it is predicted that the application of RMF and seed rotation in the same direction may enhance supersaturation below the seed.

2011 ◽  
Vol 697-698 ◽  
pp. 533-536 ◽  
Author(s):  
Zi Qiang Zhang ◽  
G.Y. Yu ◽  
S.B. Chen ◽  
Z.D. Zheng ◽  
R.D. Li ◽  
...  

Increasingly, induction heaters are being widely applied to the energy-saving light industrial equipment. But their electromagnetic radiation’s impact on the environment can’t be ignored. In the paper, several medium frequency induction heaters had been studied under different experimental conditions using E61 electromagnetic field strength analyzer, and as its supplement, the racetrack-coils induction heater had been simulated using ANSYS. According to ICNIRP guidelines, the results show that their radiation is generally in critical state, and magnetic field strength is superstandard in some areas. And countermeasures to the problems are advised.


2012 ◽  
Vol 48 (12) ◽  
pp. 2103-2111 ◽  
Author(s):  
Liping Yao ◽  
Zhong Zeng ◽  
Yi Zhang ◽  
Zhouhua Qiu ◽  
Huan Mei ◽  
...  

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 586
Author(s):  
Che-Jui Chang ◽  
Jean-Fu Kiang

Strong flares and coronal mass ejections (CMEs), launched from δ-sunspots, are the most catastrophic energy-releasing events in the solar system. The formations of δ-sunspots and relevant polarity inversion lines (PILs) are crucial for the understanding of flare eruptions and CMEs. In this work, the kink-stable, spot-spot-type δ-sunspots induced by flux emergence are simulated, under different subphotospheric initial conditions of magnetic field strength, radius, twist, and depth. The time evolution of various plasma variables of the δ-sunspots are simulated and compared with the observation data, including magnetic bipolar structures, relevant PILs, and temperature. The simulation results show that magnetic polarities display switchbacks at a certain stage and then split into numerous fragments. The simulated fragmentation phenomenon in some δ-sunspots may provide leads for future observations in the field.


2000 ◽  
Vol 78 (1) ◽  
pp. 21-27 ◽  
Author(s):  
C. Harris ◽  
W. Boivin ◽  
S. Boyd ◽  
J. Coletta ◽  
L. Kerr ◽  
...  

PAMM ◽  
2008 ◽  
Vol 8 (1) ◽  
pp. 10953-10954 ◽  
Author(s):  
K. Fraňa ◽  
J. Stiller ◽  
K. Horáková

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