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收稿日期:
2024-01-16
修回日期:
2024-06-01
出版日期:
2024-06-24
通讯作者:
陈巨辉
作者简介:
陈巨辉(1982—),女,博士,教授, chenjuhui@hrbust.edu.cn
基金资助:
Juhui CHEN(), Ran AN, Dan LI, Haoming GAO, Kun ZHANG
Received:
2024-01-16
Revised:
2024-06-01
Online:
2024-06-24
Contact:
Juhui CHEN
摘要:
纳米颗粒存在较强的颗粒间作用力。在传统磁化模型基础上添加范德华力模型,采用有限体积法 (FVM) 与离散单元法 (DEM) 进行数值模拟,运用Fluent-EDEM双平台耦合进行气固两相流分析,研究不同磁场方向与不同磁感应强度下范德华力对纳米颗粒运动的影响。结果表明,纳米颗粒间的范德华力对磁场流化床中颗粒运动的影响不可忽略,其在低磁通量密度下与磁化力之间存在明显牵制关系;磁场角度为0°时纳米颗粒分层现象明显,随场强增大分层效果逐渐缓解;范德华力也会在一定程度上促使颗粒运动方向发生偏转。范德华力模型的引入进一步拓宽了磁化模型的适用范围,为研究纳米颗粒在磁场中的运动提供数据支持。
中图分类号:
陈巨辉, 安然, 李丹, 高浩铭, 张坤. 范德华力对磁场流化纳米颗粒运动影响[J]. 化工学报, DOI: 10.11949/0438-1157.20240078.
Juhui CHEN, Ran AN, Dan LI, Haoming GAO, Kun ZHANG. Effect of van der Waals forces on the motion of magnetic field fluidized nanoparticles[J]. CIESC Journal, DOI: 10.11949/0438-1157.20240078.
最小网格尺寸 | 网格数量(个) | 总动能(10-10·J) |
---|---|---|
1R | 6229 | 0.0642 |
2R | 4163 | 0.0471 |
3R | 2248 | 0.0243 |
4R | 1920 | 0.0238 |
5R | 863 | 0.0386 |
6R | 664 | 0.0497 |
表1 网格无关性检验
Table 1 Grid independence test
最小网格尺寸 | 网格数量(个) | 总动能(10-10·J) |
---|---|---|
1R | 6229 | 0.0642 |
2R | 4163 | 0.0471 |
3R | 2248 | 0.0243 |
4R | 1920 | 0.0238 |
5R | 863 | 0.0386 |
6R | 664 | 0.0497 |
名称 | 实验参数 | 模拟参数 |
---|---|---|
颗粒直径/ m | 1.7e-8 | 1.7e-8 |
颗粒密度/(kg/m3) | 850 | 850 |
气相密度/(kg/m3) | 1.29 | 1.29 |
注入颗粒数量 | - | 800 |
纳米颗粒磁导率/(H/m) | 8.3 | 8.3 |
杨氏模量/ GPa | 68.95 | 68.95 |
泊松比 | 0.33 | 0.33 |
颗粒-颗粒摩擦系数 | 0.3 | 0.3 |
颗粒弹性刚度/(N/m) | 800 | 800 |
颗粒-壁面摩擦系数 | 0.3 | 0.3 |
墙壁弹性刚度/(N/m) | 800 | 800 |
阻尼系数 | 0.05 | 0.05 |
表2 模拟参数
Table 2 Analog parameter
名称 | 实验参数 | 模拟参数 |
---|---|---|
颗粒直径/ m | 1.7e-8 | 1.7e-8 |
颗粒密度/(kg/m3) | 850 | 850 |
气相密度/(kg/m3) | 1.29 | 1.29 |
注入颗粒数量 | - | 800 |
纳米颗粒磁导率/(H/m) | 8.3 | 8.3 |
杨氏模量/ GPa | 68.95 | 68.95 |
泊松比 | 0.33 | 0.33 |
颗粒-颗粒摩擦系数 | 0.3 | 0.3 |
颗粒弹性刚度/(N/m) | 800 | 800 |
颗粒-壁面摩擦系数 | 0.3 | 0.3 |
墙壁弹性刚度/(N/m) | 800 | 800 |
阻尼系数 | 0.05 | 0.05 |
B0/(T) β/(deg) | 0.01 | 0.0125 | 0.02 |
---|---|---|---|
0 | C1 | C5 | C9 |
30 | C2 | C6 | C10 |
60 | C3 | C7 | C11 |
90 | C4 | C8 | C12 |
表3 模拟工况
Table 3 Simulated working condition
B0/(T) β/(deg) | 0.01 | 0.0125 | 0.02 |
---|---|---|---|
0 | C1 | C5 | C9 |
30 | C2 | C6 | C10 |
60 | C3 | C7 | C11 |
90 | C4 | C8 | C12 |
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