壁面效应对剪切稀化流体内气泡上浮特性的影响

庞明军; 牛瑞鹏; 陆敏杰

doi:10.21656/1000-0887.400194

壁面效应对剪切稀化流体内气泡上浮特性的影响

doi: 10.21656/1000-0887.400194

常州大学机械工程学院;江苏省绿色过程装备重点实验室, 江苏常州 213164

基金项目: 国家自然科学基金（51376026）;江苏高校“青蓝工程”优秀青年骨干教师项目

详细信息

作者简介:
庞明军（1976—），男，副教授，博士(通讯作者. E-mail: pangmj@cczu.edu.cn).

中图分类号: TQ021.1
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- 被引次数: 0
出版历程
- 收稿日期: 2019-06-19
- 修回日期: 2019-08-04
- 刊出日期: 2020-02-01

Wall Effects on Floating Characteristics of Bubbles in Shear-Thinning Fluids

School of Mechanical Engineering; Jiangsu Key Laboratory of Green Process Equipment, Changzhou University, Changzhou, Jiangsu 213164, P.R.China

Funds: The National Natural Science Foundation of China（51376026）

摘要

摘要: 数值研究了壁面效应对剪切稀化流体内气泡上浮运动特性的影响，气液两相的界面捕捉采用流体体积（VOF）法，剪切稀化流体流变特性和气液相间表面张力的计算分别采用Carreau模型和连续表面张力模型.详细研究了不同流变指数下，壁面效应对气泡形状、液相流场和气泡终端速度的影响.结果表明，强的壁面效应或弱的剪切稀化程度会限制气泡的变形和尾涡的形成，使气泡的终端速度减小；气泡终端速度最易受壁面效应的影响；强的壁面效应和强的剪切稀化程度会导致高剪切速率区域出现在壁面附近，引起壁面附近液相表观黏度大幅度的下降.
- 壁面效应 /
- 剪切稀化 /
- 气泡运动特性 /
- 流体体积法
Abstract: The wall effects on the floating motion of bubbles in shear-thinning fluids were investigated with the numerical method. The interface between the bubble and the liquid phase was tracked with the volume of fluid (VOF) method. The Carreau model and the continuous surface tension model were used to calculate the rheological properties of the shear-thinning fluid and to compute the surface tension between gas and liquid phases, respectively. For different rheological indexes, the wall effects on the bubble shape, the liquid-phase flow field and the bubble terminal velocity were studied in detail. The results show that, the strong wall effect or the weak shear-shining effect can hinder the bubble deformation and the formation of wake vortices, and can reduce the bubble terminal velocity. Among all physical parameters, the bubble terminal velocity is most liable to the wall effect. For the strong wall effect and the strong shear-shining effect, the high-shear-rate region will occur near the wall, which results in a significant decrease in the apparent viscosity of the liquid phase near the wall.
- wall effect /
- shear-thinning /
- bubble dynamics /
- VOF

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参考文献(20)

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