雷诺数和界面污染程度对气泡水动力学特性的影响  

Influence of Reynolds number and interfacial contamination degree on hydrodynamic characteristic of bubble

作　　者：庞明军[1,2] 费洋[1,2] 陈小洪 郭雨晨 徐梦沁 Pang Mingjun;Fei Yang;Chen Xiaohong;Guo Yuchen;Xu Mengqin(School of Mechanical Engineering, Changzhou University, Changzhou 213164, China;Jiangsu Key Laboratory of Green Process Equipment, Changzhou University, Changzhou 213164, China)

机构地区：[1]常州大学机械工程学院,常州213164 [2]常州大学江苏省绿色过程装备重点实验室,常州213164

出　　处：《农业工程学报》2019年第4期99-105,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(No.51376026);江苏省"青蓝工程"资助;江苏省大学生创新创业训练计划项目(20181029032Y)

摘　　要：深入研究气泡界面污染程度对气泡水动力学特性的影响,对控制和改善泡状流动中气泡的运动速度和气液界面的传质和传热性能具有重要意义。为此,该文利用停滞帽模型详细研究了不同气泡雷诺数下,球形气泡界面污染程度对气泡界面参数(切向速度、压力、切应力和涡量)及其整体运动特征(尾流和阻力系数)的影响。基于停滞帽模型,通过改变帽角来定量控制气泡界面的污染程度,气泡雷诺数20≤Reb≤200,计算区域为轴对称结构。研究表明,在不同气泡雷诺数下,气泡界面污染程度对气泡水动力学单一物理参量的影响趋势是相似的,且界面参数在帽角处发生了突变;界面污染程度对气泡整体运动特征的影响与气泡雷诺数有关,气泡雷诺数越小,界面污染程度对阻力系数的影响越明显,而尾涡现象越弱。The bubble flow is extensively encountered in natural and industrial fields. For the majority of bubbly flows, the liquid phase is more or less polluted, which causes the change of the interfacial state of the bubble. The state of the bubble interface has the significant effect on hydrodynamic properties around the bubble. Furthermore, the changed flow field around the bubble directly influences the heat and mass transfer properties between the bubble and the liquid phases too. Therefore, it is necessary to deeply investigate the influence of interface contaminated degree on the dynamic properties of the bubble. In this paper, a bubble with the diameter of d is considered to be suspended in a rectangular region and the fluid flows around it with the velocity of U. As for the size of the region, the distances between the bubble center and the inlet, the outlet and the region wall are 5, 12 and 7 d, respectively. In view of the physical environment of the bubble, the bubble Reynolds number is not lager than 200, and thus the flow structure exhibits the two-dimensional properties. So the axisymmetric field can be used as the computational region, and thus the computational cost can drop greatly. Considering the contaminated degree of the bubble surface, the stagnant cap model is used. With this model, the interface contaminated degree is controlled artificially by changing boundary conditions (such as the interfacial velocity and the tangential stress) directly on the bubble surface. The cap angle, measuring from the rear stagnant point to the front edge of the contaminated interface, is used to describe the interface contaminated degree. In order to understand physical phenomena deeply, the computational cases as many as possible are designed. The cape angles representing the interfacial pollution degree are respectively designated as 0, 15°, 30°, 45°, 60°, 75°, 90°, 105°, 120°, 135°, 150°, 165° and 180°, and the bubble Reynolds numbers are selected as 20, 40, 75, 100, 150 and 200. For the present inves

关 键 词：气泡 水动力学 雷诺数 污染程度 泡状流动 停滞帽模型 

分 类 号：O368[理学—流体力学]