气相沉积法制备碳纳米管纤维反应器气体流场模拟

doi:10.19398/j.att.202104032

摘要/Abstract

摘要：

为了探讨制备碳纳米管纤维的直立式气相沉积反应器气体流场,选用计算流体力学软件Gambit和Fluent分别对直立式气相沉积反应器气体流场进行建模和数值模拟,模拟得到反应器内部气体速度、温度和浓度分布。结果表明:气体从进气管口射出时速度达到峰值1.79 m/s;在加热段时速度逐渐趋向于稳定,为0.02 m/s,温度逐渐趋向于反应器管壁温度(1500K);碳源甲烷气体在反应器加热段呈现泊肃叶分布。直立式气相沉积反应器加热段气体流场呈现低速平缓高温,是适宜碳纳米管合成和碳纳米管纤维形成的有利环境和主要区域。

关键词: 碳纳米管纤维, 化学气相沉积, 气体流场, 数值模拟

Abstract:

In order to investigate the gas flow field in the vertical vapor deposition reactor for preparing carbon nanotube fibers, the fluid dynamics software Gambit and Fluent were used to model and simulate the gas flow field in the vertical vapor deposition reactor numerically. The distributions of gas velocity, temperature and concentration inside the reactor were obtained through simulation. The results show that gas velocity reaches a peak of 1.79 m/s when it is ejected from the inlet pipe. In the process of heating, the velocity gradually stabilizes at 0.02 m/s. The temperature gradually approaches the temperature of reactor wall at 1500K. The carbon source methane gas presents a Poiseuille distribution during the heating of reactor. During the heating of vertical vapor deposition reactor, the gas flow field presents low-speed and steady high temperature, which is a favorable environment and major area for the synthesis of carbon nanotubes and formation of carbon nanotube fibers.

Key words: carbon nanotube fiber, chemical vapor deposition, gas flow field, numerical simulation

中图分类号:

TS101.2

周梓豪, 吴丽莉, 陈廷. 气相沉积法制备碳纳米管纤维反应器气体流场模拟[J]. 现代纺织技术, 2022, 30(2): 99-105.

ZHOU Zihao, WU Lili, CHEN Ting. Simulation of gas flow field in reactor for preparation of carbon nanotube fibers by chemical vapor deposition[J]. Advanced Textile Technology, 2022, 30(2): 99-105.

图/表 12

图1 反应器结构

Fig.1 Structureof vertical reactor

表1 材料属性参数

Tab.1 Material property parameters

性能	材料
性能	氢气	甲烷	铜	石英	碳纳米管颗粒
密度ρ/(kg·m^-3)	0.0819	0.6679	8978	2650	1700
比热容C_p/(J·kg^-1·K^-1)	14283	2222	381	730	1220
导热系数K/(W·m^-1·K^-1)	0.1672	0.0332	388	15	3000
动力黏度μ/(kg·m^-1·s^-1)	8.411×10^-6	1.087×10^-5	-	-	-

图2 气体流场速度分布

Fig.2 Velocity distribution of gas flow field

图3 气体流场中轴线速度分布曲线

Fig.3 Velocity distribution curve on the central axis of gas flow field

图4 气体流场温度分布

Fig.4 Temperature distribution of gas flow field

图5 气体流场中轴线温度分布曲线

Fig.5 Temperature distribution curve on the central axis of gas flow field

图6 甲烷气体摩尔浓度分布

Fig.6 Molar concentration distribution of methane

图7 甲烷气体摩尔分数分布

Fig.7 Mole fraction distribution of methane

图8 氢气摩尔浓度分布

Fig.8 Molar concentration distribution of hydrogen

图9 氢气摩尔分数分布

Fig.9 Mole fraction distribution of hydrogen

图10 反应器气体流场回流速度矢量分布

Fig.10 Vector distribution of reflux velocity in reactor gas flow field

图11 Conroy研究所得反应器内部流线[15]

Fig.11 Streamline diagram of gas flow in reactor obtained by Conroy[15]

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