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Study on Effects of Different Carrier Gases on Characteristics of the Supersaturated Environment in the One-/Multi-section Growth Tube
Energy & Fuels ( IF 5.3 ) Pub Date : 2018-01-12 00:00:00 , DOI: 10.1021/acs.energyfuels.7b03153
Yan Yu 1 , Junchao Xu 1 , Jun Zhang 1 , Guangchuang Chen 1 , Hui Zhong 1
Affiliation  

The supersaturation profiles in the one-/multi-section growth tube were predicted under the conditions of different carrier gases for two kinds of typical supersaturation-achieving methods. The results show that Lewis number (Le) of the carrier gas is an important factor affecting the supersaturation profiles. For the one-section growth tube, the carrier gas with a smaller Le is beneficial to a higher level and flatter trend of supersaturation profiles for method 1, where the supersaturated environment is achieved by a cool saturated flow into a warm-walled growth tube. However, for the carrier gas of a larger Le, the higher level but less stable supersaturation profiles are presented from method 2, with a warm saturated flow into a cold-walled growth tube. With the carrier gas of large Le (>1) from method 1 and the carrier gas of small Le (<0.5) from method 2, an efficient supersaturated environment cannot be achieved under the ordinary conditions. In the multi-section growth tube, the more minimum number of the sections is selected for stable supersaturation profiles with the carrier gas of larger Le. Additionally, the sections of a flatter supersaturated environment are closely related to the achieving methods of a supersaturation environment, the whole length of the growth tube, and radial positions.

中文翻译:

单段/多段生长管中不同载气对过饱和环境特性影响的研究

针对两种典型的实现过饱和的方法,在不同载气条件下,预测了单节/多节生长管中的过饱和曲线。结果表明,载气的路易斯数(Le)是影响过饱和曲线的重要因素。对于单段式生长管,具有较小Le的载气有利于方法1的过饱和曲线处于较高水平且趋于平坦的趋势,其中过饱和环境是通过向冷壁生长管中注入冷饱和气流来实现的。但是,对于较大Le的载气,方法2中显示了较高水平但不稳定的过饱和曲线,其中饱和热流进入冷壁生长管。使用方法1中的大Le(> 1)载气和小Le(< 0.5)方法2中,通常条件下无法实现有效的过饱和环境。在多段式生长管中,选择更多的最小段数以实现具有较大Le的载气的稳定过饱和曲线。此外,较平坦的过饱和环境的各个部分与过饱和环境的实现方法,生长管的整个长度以及径向位置密切相关。
更新日期:2018-01-12
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