摘要
为了探究化学气相沉积法增加侧进气口后直立式反应器内的纤维运动形态,以研究纤维运动形态对碳纳米管纤维生成机理的影响。文章根据建立的纤维/气体两相流动模型,首先通过数值模拟求解气体流场,求解得到气体速度,再通过数值模拟法求解纤维在气体流场中的运动。模拟结果表明:加装侧进气口后反应器内的气体速度波动很大,且产生明显的涡流区域,尤其是反应器前段,进入加热段之后,漩涡变小、变长,最后气体速度逐渐稳定,近壁区也产生回流和漩涡;纤维在此反应器内的运动波动明显,并且产生伸长。通过模拟得到的纤维运动形态有利于碳纳米管纤维“袜筒”结构的生成且有利于碳纳米管纤维的致密化。
The paper investigates the effect of fiber morphology on the formation mechanism of carbon nanotube fibers in a vertical reactor with a side inlet by chemical vapor deposition(CVD).According to the established fiber/gas two-phase flow model,the gas flow field is solved by numerical simulation to obtain the gas velocity,and then the fiber movement in the gas flow field is solved by numerical simulation.The simulation results showed that the gas velocity in the reactor with a side inlet fluctuated a lot,and there were obvious vortex regions,especially in the front section of the reactor.After entering the heating section,the vortex became smaller and longer.In the end,the gas velocity became stable;and there were reflux and vortex in the near wall region.The fiber movement in this reactor fluctuated obviously and elongated at the same time.The fiber movement obtained by the simulation is conducive to the formation of a carbon nanotube fiber“hose”structure and th e densification of carbon nanotube fiber.
出处
《纺织导报》
CAS
2021年第11期49-52,共4页
China Textile Leader
基金
南通市基础科学研究项目(JC2019008)。
关键词
化学气相沉积法
气体流场
纤维模型
数值模拟
纤维运动
chemical vapor deposition
gas flow field
fiber model
numerical simulation
fiber movement
