化工学报 ›› 2023, Vol. 74 ›› Issue (5): 1950-1964.DOI: 10.11949/0438-1157.20221462
收稿日期:
2022-11-08
修回日期:
2023-04-12
出版日期:
2023-05-05
发布日期:
2023-06-29
通讯作者:
冯颖
作者简介:
董鑫(1990—),女,博士,副教授,dongxin1106@syuct.edu.cn
基金资助:
Xin DONG(), Yongrui SHAN, Yinuo LIU, Ying FENG(), Jianwei ZHANG
Received:
2022-11-08
Revised:
2023-04-12
Online:
2023-05-05
Published:
2023-06-29
Contact:
Ying FENG
摘要:
为进一步探究非牛顿流体中气液两相流流动特性规律,采用大涡模拟方法(LES)对非牛顿流体气泡羽流的涡特性进行研究。以清水和不同质量分数的羧甲基纤维素钠(CMC)水溶液为研究对象,分析不同表观气速和液相流变特性下气体的运动速度、羽流结构、涡量及涡的演变规律。研究结果表明,涡的演变速率随非牛顿流体浓度的增加而减小。结合Q判据分析不同工况下涡特性分布,随着CMC水溶液浓度的增加流场中的Q值不断降低,且流场内涡的演变速率随着非牛顿流体特性的增加而减弱。
中图分类号:
董鑫, 单永瑞, 刘易诺, 冯颖, 张建伟. 非牛顿流体气泡羽流涡特性数值模拟研究[J]. 化工学报, 2023, 74(5): 1950-1964.
Xin DONG, Yongrui SHAN, Yinuo LIU, Ying FENG, Jianwei ZHANG. Numerical simulation of bubble plume vortex characteristics for non-Newtonian fluids[J]. CIESC Journal, 2023, 74(5): 1950-1964.
液相 | 质量分数c/% | 黏稠系数K/(Pa·s n ) | 流动指数n | 密度ρL/(kg/m3) | 表面张力σ/(mN/m) |
---|---|---|---|---|---|
清水 | 0 | 0.001 | 1 | 998.21 | 72.75 |
CMC水溶液 | 0.3 | 0.043 | 0.8363 | 1002.79 | 52.17 |
0.4 | 0.0745 | 0.8017 | 1004.54 | 53.98 | |
0.5 | 0.1685 | 0.7317 | 1005.43 | 66.04 |
表1 液相物性和流变参数
Table 1 Liquid phase properties and rheological parameters
液相 | 质量分数c/% | 黏稠系数K/(Pa·s n ) | 流动指数n | 密度ρL/(kg/m3) | 表面张力σ/(mN/m) |
---|---|---|---|---|---|
清水 | 0 | 0.001 | 1 | 998.21 | 72.75 |
CMC水溶液 | 0.3 | 0.043 | 0.8363 | 1002.79 | 52.17 |
0.4 | 0.0745 | 0.8017 | 1004.54 | 53.98 | |
0.5 | 0.1685 | 0.7317 | 1005.43 | 66.04 |
图4 实验装置1—空气泵;2—空气转子流量计;3—光源;4—微孔曝气盘;5—水箱;6—高速摄像机;7—计算机
Fig.4 Diagram of experimental device1—air pump; 2—air flow rate meter; 3—lighting source; 4—microbubble aerator; 5—water tank; 6—high speed camera; 7—computer
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