Search

First, this paper analyzes the plasma discharge and fluid model, and constructs the plasma discharge model by drift-diffusion approximation control equation, heavy particle component control equation, electric field distribution and volume force calculation, and plasma chemical kinetic model. Next, the coupling mechanism of inductively coupled RF plasma and its discharge characteristics are analyzed. Finally, the magnetized inductively coupled plasma discharge is simulated numerically. The results demonstrate that the current flowing on an inductor coil develops quicker at 0.045T and then calms down with an increase in the supplied constant dynamic magnetic field power, but the coil voltage exhibits the reverse effect.

Tb3Sc1.95Lu0.05Al3O12 (TSLAG) crystals are novel and high-quality magneto-optical materials with the most promising application as the core component of Faraday devices. Cracking is an obstacle to TSLAG crystal growth and is closely influenced by crystal thermal stress distribution. In this work, the evolution of thermal stress during TSLAG crystal growth in the initial Czochralski (Cz) furnace is numerically studied. The reasons for high thermal stress in TSLAG crystal are explained based on the results about the melt flow, the temperature distribution in the furnace, and the crystal/melt interface shape. A large crucible with a shallow melt is proposed to address the problem of significant variations in melt depth during TSLAG crystal growth. Based on the numerical results, the proposed design can stabilize the melt flow structure, suppressing changes in the crystal/melt interface shape and effectively improving thermal stress in the TSLAG crystal growth process, which contributes to precisely regulating the preparation of large-sized high-quality TSLAG crystals. [ABSTRACT FROM AUTHOR]

In order to study the effect of pyrite oxidation products on the spontaneous combustion of coal, five kinds of compounds of pyrite oxidation products with 6% of a mass fraction were added to the coal sample of Yangmei No. 5 Mine. The analysis shows that the weightlessness and ignition activation energy of coal samples after adding Fe3+, Fe2+, and H+ are reduced compared with YM. Fe3+ and Fe2+ catalyze the free radical chain reaction during the spontaneous combustion of coal, promote the development of C = O and -CO-O-, and accelerate the oxidation reaction of -CH3, -CH2- and -OH. H+ reduces the content of Si-O-Si structure. After adding Fe(OH)3 and S0, the activation energy of coal samples is higher than that of YM. Through the adiabatic oxidation experiment, it can be seen that Fe3+, Fe2+, H+ shorten the shortest ignition time of YM coal samples 40.7 h, 32 h, 4.6 h. Fe(OH)3 and S0 prolong the shortest ignition time of YM coal samples by 7.1 h and 21.8 h, respectively. This shows that the oxidation products of FeS2 play an important role in promoting low-temperature oxidation of coal. [ABSTRACT FROM AUTHOR]