[1]庞明军,张 展,谢程程.气泡体积分数对液相湍流流场和减阻率的影响[J].常州大学学报(自然科学版),2019,31(04):57-69.[doi:10.3969/j.issn.2095-0411.2019.04.009]
　PANG Mingjun,ZHANG Zhan,XIE Chengcheng.Effect of Bubble Void Fraction on Drag-Reducing Rate and Liquid Turbulent Flow Field[J].Journal of Changzhou University(Natural Science Edition),2019,31(04):57-69.[doi:10.3969/j.issn.2095-0411.2019.04.009]
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气泡体积分数对液相湍流流场和减阻率的影响()
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常州大学学报(自然科学版)[ISSN:2095-0411/CN:32-1822/N]

卷:
第31卷
期数:
2019年04期
页码:
57-69
栏目:
机械制造及其自动化
出版日期:
2019-07-28

文章信息/Info

Title:
Effect of Bubble Void Fraction on Drag-Reducing Rate and Liquid Turbulent Flow Field
文章编号:
2095-0411(2019)04-0057-13
作者:
庞明军; 张 展; 谢程程
(常州大学 机械工程学院,江苏 常州 213164)
Author(s):
PANG Mingjun;  ZHANG Zhan;  XIE Chengcheng
(School of Mechanical Engineering, Changzhou University, Changzhou 213164, China)
关键词:
泡状流动;  中等尺度气泡;  气泡减阻;  气相体积分数
Keywords:
bubbly flow;  mesoscopic bubble;  drag reduction by bubbles;  gas void fraction
分类号:
TQ 021.1
DOI:
10.3969/j.issn.2095-0411.2019.04.009
文献标志码:
A
摘要:
采用混合模型和雷诺应力模型,对水平槽道内气泡减阻效应进行了数值研究,并采用群体平衡模型描述气泡群的时空演变过程。结果表明:在液相雷诺数Re=20 000不变的情况下,减阻率与气相平均体积分数的大小具有直接关系,随着气相平均体积分数的增加,气泡数目随之增多,气泡抑制湍流的能力加强,减阻率也随之增大; 目前最高减阻率已达28%。而且气泡对黏性应力的影响较小,而对雷诺应力具有较大的抑制作用,这或许是导致摩擦阻力减小的主要原因。
Abstract:
In order to understand interactions between bubbles and liquid, the multiphase mixture model combined with Reynolds stress turbulence model were used to investigate the drag reduction by bubbles in a horizontal channel. And the population balance model was used to simulate the temporaland spatial evolution of bubbles. The present result shows that there is the direct relation between the bubble global void fraction and the drag-reducing rate when the liquid Reynolds number is Re=20 000; the bubble number increases with the increase of the global void fraction, leading to an increase on the suppression degree of the bubbles on the liquid-phase turbulence and 28% increase on the drag reduction rate. In addition, the bubbles has the slight influence on the viscous stress, but they sharply reduce the Reynolds stress; the decrease of the liquid reynolds stress may be the main reason that for the reduction of friction resistance.

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备注/Memo

备注/Memo:
收稿日期:2018-11-10。
基金项目:国家自然科学基金资助项目(51376026)。
作者简介:庞明军(1976—),男,山西大同人,博士,副教授。E-mail: pangmj@cczu.edu.cn
更新日期/Last Update: 2019-07-16