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收稿日期:
2024-04-28
修回日期:
2024-06-22
出版日期:
2024-07-08
通讯作者:
于源
作者简介:
刘克润(1998—),男,硕士研究生,2021200640@buct.edu.cn
基金资助:
Received:
2024-04-28
Revised:
2024-06-22
Online:
2024-07-08
Contact:
Yuan YU
摘要:
为探究颗粒团聚体在分级机流场内的破碎规律,基于软球模型研究了涡流空气分级流场中团聚体破碎行为及组成团聚体的单颗粒粒径、单颗粒数和团聚体形状对团聚体破碎的影响。结果表明:团聚体进入分级流场后在流体曳力的作用下先发生变形随后破碎;颗粒越小,其组成的团聚体团聚性越强;球形团聚体团聚性最强,圆柱体团聚体次之,立方体团聚体团聚性最弱;组成团聚体的单颗粒数越多,其在分级流场中完全解团所需时间越长,当团聚体大到一定程度时可能无法完全解团则被收集为粗粉,导致“鱼钩效应”。因此,通过优化流场延缓团聚体沉降或对粉体原料预分散处理有利于团聚体解团。
中图分类号:
刘克润, 于源. 涡流空气分级流场中团聚体破碎规律研究[J]. 化工学报, DOI: 10.11949/0438-1157.20240470.
Kerun LIU, Yuan YU. Study of aggregate fragmentation laws in turbo air classification flow field[J]. CIESC Journal, DOI: 10.11949/0438-1157.20240470.
参数 | 数值 |
---|---|
空气动力黏度μ/Pa·s | 1.83×10-5 |
空气密度 | 1.205 |
颗粒密度 | 2700 |
杨氏模量E/GPa | 2 |
泊松比 | 0.2 |
时间步长δt/s | 10-8 |
Hamaker常数A/J | 5×10-19[ |
颗粒表面能 | 0.0826[ |
进口风速/ m·s-1 | 12 |
转笼转速/ r·min-1 | 1200 |
表1 数值模拟参数设置
Table 1 Parameter settings in the numerical simulation
参数 | 数值 |
---|---|
空气动力黏度μ/Pa·s | 1.83×10-5 |
空气密度 | 1.205 |
颗粒密度 | 2700 |
杨氏模量E/GPa | 2 |
泊松比 | 0.2 |
时间步长δt/s | 10-8 |
Hamaker常数A/J | 5×10-19[ |
颗粒表面能 | 0.0826[ |
进口风速/ m·s-1 | 12 |
转笼转速/ r·min-1 | 1200 |
图3 三个不同位置释放的团聚体在分级流场中不同时刻的形态变化
Fig. 3 The morphological changes of aggregates released in different locations at different time in classification flow field
图11 不同粒径单颗粒组成的团聚体的团聚率ξ和接触率Lk随时间变化情况
Fig. 11 The changes of the aggregation rate ξ and contact rate Lk of aggregates with different single particle sizes
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