化工学报 ›› 2023, Vol. 74 ›› Issue (5): 1950-1964.DOI: 10.11949/0438-1157.20221462

• 流体力学与传递现象 • 上一篇    下一篇

非牛顿流体气泡羽流涡特性数值模拟研究

董鑫(), 单永瑞, 刘易诺, 冯颖(), 张建伟   

  1. 沈阳化工大学机械与动力工程学院,辽宁 沈阳 110142
  • 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:
    辽宁省自然科学基金资助项目(2020-BS-172);辽宁省教育厅科学研究经费资助项目(LQ2020017)

Numerical simulation of bubble plume vortex characteristics for non-Newtonian fluids

Xin DONG(), Yongrui SHAN, Yinuo LIU, Ying FENG(), Jianwei ZHANG   

  1. School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China
  • 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。

关键词: 气液两相流, 非牛顿流体, 计算流体力学, 涡量, Q判据

Abstract:

In order to further explore the flow characteristics of gas-liquid two-phase flow in non-Newtonian fluid, the large eddy simulation (LES) method was used to study the vortex characteristics of bubble plume in non-Newtonian fluid. Taking clean water and sodium carboxymethyl cellulose (CMC) aqueous solutions with different mass fractions as the research objects, the velocity, plume structure, vorticity and vortex evolution of gas under different apparent gas velocities and liquid rheological properties were analyzed. The results show that the evolution rate of vortices decreases with the increase of non-Newtonian fluid concentration. Combined with the Q criterion, the vortex characteristics distribution under different working conditions was analyzed. With the increase of CMC aqueous solution concentration, the Q value in the flow field decreased continuously, and the evolution rate of vortex in the flow field weakened with the increase of non-Newtonian fluid characteristics.

Key words: gas-liquid flow, non-Newtonian fluids, CFD, vorticity, Q criterion

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