Particle trajectories and temperature histories of TiO2 nanoparticles synthesized in diffusion flame reactor.
Particle trajectories and temperature histories of TiO2 nanoparticles synthesized in diffusion flame reactor.
复制标题
在扩散火焰反应器中合成的 TiO2 纳米粒子的粒子轨迹和温度历史。
DOI：
10.1166/jnn.2009.m43
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发表时间：
2009
影响因子：
--
通讯作者：
K. Kim
中科院分区：
文献类型：
--
作者：
Piyabutr Sunsap;Dongjoo Kim;T. Charinpanitkul;K. Kim
计算分析的发展，以说明在氧-甲烷扩散火焰反应器中的气体温度和速度分布的TiO 2纳米粒子的形成和TiO 2纳米粒子的收集过滤器。计算模拟表明，气体温度和速度的增加显着影响的甲烷流量的增加。利用该模型计算了颗粒的运动轨迹，该模型考虑了热泳力和气流速度对颗粒运动的影响。从径向上不同初始位置开始的粒子将以不同的轨迹运动。遵循不同轨迹的颗粒具有不同的温度历史以及在气相中的停留时间。当颗粒在远离中心轴的反应器初始位置开始时，它们在气相中花费更长的时间并且存款在过滤器的较高位置。对于从反应器的初始位置开始的颗粒，其距离中心轴超过0.5 cm，它们移动到派热克斯管而不是过滤器上存款。随着CH 4流速的增加，颗粒进一步远离中心轴移动，但是颗粒存款在过滤器上所花费的时间更短。在较高的CH 4流速下合成的颗粒显示出比在较低的CH 4流速下合成的颗粒显著更高的温度历史。扩散火焰反应器中颗粒的温度历史可以作为控制纳米TiO 2性能的重要信息。
The computational analysis was developed to illustrate the gas temperature and velocity profiles in the oxy-methane diffusion flame reactor during the formation of TiO2 nanoparticles and the collection of the TiO2 nanoparticles by filter. The computational simulation shows that the increase in gas temperature and velocity is significantly affected by the increase in CH4 flow rate. The particle trajectory was calculated by using the model, which concerns the effects of thermophoretic force and gas velocity on the particle movement. The particles starting from different initial positions in radial direction will move in different trajectories. The particles following different trajectories have different temperature histories and also residence times in the gas phase. As the particles start at the initial position of the reactor which is further away from the central axis, they spend longer time in the gas phase and deposit on the higher position of filter. For particles starting at the initial position of the reactor which is further than 0.5 cm from the central axis, they move to deposit on the pyrex tube instead of filter. As the CH4 flow rate increases, the particles move further from the central axis, but it takes a shorter time for the particles to deposit on the filter. The particles synthesized at a higher CH4 flow rate show significantly higher temperature history than those particles synthesized at a lower CH4 flow rate. The temperature histories of particles in diffusion flame reactor can be quite important information to control the properties of TiO2 nanoparticles.