立式缩放管内液固颗粒群浓度分布与汇聚特性

doi:10.16085/j.issn.1000-6613.2021-2431

摘要/Abstract

摘要：

为分析颗粒群在立式缩放管内的运动规律，基于计算流体力学-离散单元（CFD-DEM）耦合方法模拟研究缩放比γ、肋高e和颗粒进口浓度α对管内颗粒群浓度分布与汇聚特性的影响。结果表明：在研究参数范围内，颗粒群的轴向浓度分布较为均匀，管下部颗粒滞留相对较多；颗粒群径向相对浓度遵循管中心区域浓度低，近壁面颗粒相对浓度较高的规律；肋高e=1.0mm的缩放管在颗粒进口浓度α≤2%时，管壁附近颗粒浓度最高。在管段中上部颗粒运动相对稳定阶段，在肋高e=2.0mm与缩放比γ≤1.0、颗粒进口浓度α≥3%工况下，颗粒群易出现汇聚现象。

关键词: 两相流, 计算流体力学-离散单元, 粒子图像测速法, 缩放管, 颗粒汇聚, 浓度分布

Abstract:

In order to analyze the motion laws of particle swarm in vertical converging-diverging tube, the effects of converging-diverging ratio γ, rib height e and particle inlet concentration α on the concentration distribution and convergence characteristics of particle swarm in vertical converging-diverging tube were simulated by the coupled CFD-DEM method. The results showed that the axial concentration of the particle group was relatively uniform, and more particles were retained in the downer part of the tube within the research parameters. The relative concentration of particles in the radial direction followed the rule of low concentration in the center of the tube and high concentration near the wall. When the inlet concentration of particles α≤2%, the particle concentration near the pipe wall was high in the scaler with rib height e=1.0mm. In the relatively stable stage of particle movement in the middle and upper part of the pipe section, when rib height e=2.0mm, scaling ratio γ≤1.0 and particle inlet concentration α≥3%, particle swarm were more likely to convergence.

Key words: two-phase flow, CFD-DEM, particle image velocimetry (PIV), converging-diverging tube, particle convergence, concentration distribution

中图分类号:

TK124

彭德其, 冯源, 王依然, 谭卓伟, 俞天兰, 吴淑英. 立式缩放管内液固颗粒群浓度分布与汇聚特性[J]. 化工进展, 2022, 41(9): 4662-4672.

PENG Deqi, FENG Yuan, WANG Yiran, TAN Zhuowei, YU Tianlan, WU Shuying. Distribution characteristics and convergence of particles in converging-diverging tube[J]. Chemical Industry and Engineering Progress, 2022, 41(9): 4662-4672.

图/表 26

图1 缩放管几何模型

表1 缩放管结构参数

缩放管编号	肋高e/mm	缩放比γ	节距P/mm
1	1.0	0.5	24
2	1.0	0.5	24
3	1.0	0.5	24
4	1.5	1.0	24
5	1.5	1.0	24
6	1.5	1.0	24
7	2.0	2.0	24
8	2.0	2.0	24
9	2.0	2.0	24

图2 网格划分

图3 网格数对Nu和f的影响

图4 时间步长对Nu和ƒ的影响

表2 300K水的物性参数

黏度 /kg·m^-1·s^-1	密度 /kg·m^-3	定压比热容 /J·kg^-1·K^-1	热导率 /W·m^-1·K^-1	Pr
0.8854×10^-6	996.5	4177	0.612	5.9

表3 颗粒参数

参数	数值	参数	数值
颗粒泊松比	0.29	颗粒-颗粒恢复系数	0.3
颗粒剪切模量/Pa	1×10⁸	颗粒-颗粒静摩擦系数	0.3
颗粒密度/kg·m^-3	2500	颗粒-颗粒滚动摩擦系数	0.02
管壁（钢）泊松比	0.28	颗粒-管壁恢复系数	0.45
管壁（钢）剪切模量/Pa	7×10¹⁰	颗粒-管壁静摩擦系数	0.5
管壁（钢）密度/kg·m^-3	7800	颗粒-管壁滚动摩擦系数	0.05

图5 缩放管液固两相流场可视化实验平台

表4 模拟工况

参数	数值
缩放管编号	1、2、3、4、5、6、7、8、9
颗粒进口浓度α	1%、2%、3%、4%

图6 实验与模拟平均涡量验证

图7 管段轴向取样图

图8 不同进口浓度α下轴向区域浓度变化

图9 不同缩放比γ下轴向区域浓度变化

图10 不同肋高e下轴向区域浓度变化

图11 径向区域划分

图12 不同进口浓度α下径向区域相对浓度变化

图13 不同缩放比γ下径向区域浓度变化

图14 不同肋高e下径向区域相对浓度变化

图15 颗粒进口浓度α=2%时管内颗粒分布

图16 颗粒进口浓度α=4%时管内颗粒分布

图17 不同颗粒进口浓度α下颗粒分布

图18 不同缩放比γ下颗粒分布

图19 不同肋高e下颗粒分布

图20 不同颗粒进口浓度α下颗粒分布色块图

图21 不同缩放比γ下颗粒分布色块图

图22 不同肋高e下颗粒分布色块图

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