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Supervised by Ministry of Industry and Information Technology of The People''s Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Related citation:Yuhang Gao,Xiaoze Du.Stability Mechanisms of Gas Bubbles Subject to Ultrasonic Field during the Rectified Diffusion in Liquids[J].Journal of Harbin Institute Of Technology(New Series),2019,26(1):68-76.DOI:10.11916/j.issn.1005-9113.18076.
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Stability Mechanisms of Gas Bubbles Subject to Ultrasonic Field during the Rectified Diffusion in Liquids
Yuhang Gao,Xiaoze Du
(Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China)
Abstract:
The spherical oscillation of a gas bubble in liquids is important to growth in liquids during rectified diffusions (e.g., the onset of the sonoluminescence and the enhancement of sonochemical reactions). The present paper numerically shows stability maps (divided into four zones), in which gas bubbles maintain the linearly spherical oscillation without nonlinear disturbance of rectified diffusions within a large range of bubble radius. The critical pressures of spherical and diffusional oscillations are two decisive indexes determining the stability status. Specifically, the stability boundaries and influential factors (including acoustic parameters and gas concentration in liquids) were discussed and analyzed. The results show that the variations of gas concentration and acoustic parameters dramatically changed the stable status of the gas bubbles. The gas bubble maintained stable status when external parameters and gas concentration were set between the two critical values properly. The cases of high-frequency and low-frequency limits were also introduced at the end of the whole paper.
Key words:  cavitation  gas bubble  gas concentration  rectified diffusion  spherical oscillation
DOI:10.11916/j.issn.1005-9113.18076
Clc Number:CV131
Fund:
Descriptions in Chinese:
  

声场中气泡在修正扩散过程中的稳定性机制

高宇航,杜小泽

(华北电力大学,电站设备状态监测与控制教育部重点实验室,北京 102206)

中文说明:

1)提出了声场中的振荡空泡扩散稳定性的判定依据

2)结合修正扩散和球形稳定性对空泡的稳定性进行分析

为解决在不同声场频率、幅值作用下空泡稳定性的机制和条件分析,通过公式推导结合数值模拟的手段对空泡的稳定性进行定量研究。并通过对比不同声场条件、浓度条件得到空化泡稳定性的数值解和稳定性区间。结果表明:外部声场条件和空泡浓度都对空化泡的扩散稳定性有影响,而球形稳定性只与外部参数有关。

关键词:空化;气泡;气体浓度;修正扩散;球形振荡

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