Influence of interface change for spherical bubble on vortex characteristic and size

FEI Yang; PANG Mingjun

doi:10.11949/j.issn.0438-1157.20170290

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Influence of interface change for spherical bubble on vortex characteristic and size

更新时间：2025-12-10

- Influence of interface change for spherical bubble on vortex characteristic and size
- CIESC Journal Issue 9, Pages: 3409-3419(2017)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20170290
  CLC： 357.1
- Online First：05 September 2017，
  
  Published：05 September 2017
- 稿件说明：
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FEI Yang, PANG Mingjun. Influence of interface change for spherical bubble on vortex characteristic and size[J]. CIESC Journal, 2017, (9): 3409-3419.
DOI：

FEI Yang, PANG Mingjun. Influence of interface change for spherical bubble on vortex characteristic and size[J]. CIESC Journal, 2017, (9): 3409-3419. DOI： 10.11949/j.issn.0438-1157.20170290.

摘要

利用计算流体力学法研究了中等Reynolds数下（25 ≤ Re ≤ 500）气泡界面污染程度对其尾流的影响。借鉴圆球绕流和停滞帽模型，提出了一种模拟中等Reynolds数下受污染球形气泡尾流的三维模型，气泡界面污染程度取决于帽角（θ）的大小，帽角越大表示气泡表面污染程度越小。研究发现：Re=25~200时，污染程度的减小会减小尾涡长度（s）、分离角（φ）以及涡中心位置（l）和（h）的数值，但不会改变其与Reynolds数表征的关系；污染程度的减小会使Re=250~500时尾涡的三维特性减弱，使Re=350时有序脱落的尾涡的强度减小并最终使其不发生脱落，使Re=500时无规律脱落的尾涡的无序性减弱并最终使其不发生脱落。

Abstract

The numerical method is employed to investigate the influence of contaminated degree of bubble surface on its wakes for the spherical bubble under moderate Reynolds number (25 ≤ Re ≤ 500). By referencing the flow past a sphere and the stagnant cap model

one kind of three-dimensional model for contaminated spherical bubble under moderate Reynolds number is proposed. The interface contaminated degree is dependent on the magnitude of the cap angle. The larger the cap angel is

the slighter the bubble interface pollution is. The present results show that

for 25 ≤ Re ≤ 200

the magnitudes of the vortex length

the vortex center position distance to the bubble rear and the separation angle decrease with the decrease of the bubble surface contaminated degree but the distribution trends of those parameters against the Reynolds number are similar; for 250 ≤ Re ≤ 500

the decrease of the bubble surface contaminated degree weakens the three-dimensional property of vortexes

reduces the strength of orderly shedding vortexes until the shedding phenomenon disappears at Re=350

and reduces the disorder of shedding vortexes until the shedding phenomenon disappears too at Re=500.

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