液体粘度对空化气泡与扁平液-液界面相互作用的影响

IF 2.5 3区 工程技术
Yang Liu, Zhi-ying Zheng, Zhi-bo He, Tian-bao Zeng, Wei-hua Cai, Hong Qi
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引用次数: 0

摘要

本研究探讨了空化气泡与两种不混相液体界面之间的相互作用,在超声乳化和废水处理等领域具有实际意义和潜在的应用前景。为探讨液体粘度对空化气泡与平面液-液界面相互作用的影响,采用高速摄像技术对由去离子水和两种不同粘度(50 mPa·s、500 mPa·s)的硅油组成的两个液-液界面附近激光诱导的空化气泡进行了可视化实验。为了产生空化气泡,采用了三个不同的位置,即界面处、水中和硅油中。观察了空化泡与界面在不同无因次距离γ下的演化过程及相应的界面变形。结果表明,硅油粘度的差异显著影响了毫米级空化气泡与界面相互作用过程中发生的物理现象。在此基础上,对空化泡射流动力学的定性和定量分析表明,射流穿透水与高粘度硅油界面(界面2,γ = 0.33)的临界值小于水与低粘度硅油界面(界面1,γ = 0.69)的临界值。界面1附近空化气泡产生的射流最大速度更高。这表明粘度的增加抑制了射流的发展。在界面1附近的水中产生的空化气泡始终从界面迁移而不分裂,而在界面2附近的空化气泡在中间γ时向界面迁移并在γ <;0.91处分裂。此外,对界面2附近的空化气泡在不同γ下的喷射行为进行了研究,并将其划分为四种类型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of liquid viscosity on the interactions between cavitation bubbles and flat liquid-liquid interfaces

This study investigates the interactions between cavitation bubbles and the interfaces of two immiscible liquids, with practical implications and potential applications in the fields such as ultrasonic emulsification and wastewater treatment. To explore the influence of liquid viscosity on the interaction between the cavitation bubble and flat liquid-liquid interface, visualization experiments were performed on the laser-induced cavitation bubbles near two liquid-liquid interfaces composed of deionized water and two silicone oils with different viscosities (50 mPa·s, 500 mPa·s) by using high-speed photography. Three different positions were employed for the generation of cavitation bubbles, i.e., at the interface, in the water, and in the silicone oil. The evolutions of cavitation bubbles and the corresponding interface deformations at different dimensionless standoff distances γ between the cavitation bubble and the interface were observed. The results show that the difference in the viscosity of silicone oil significantly affects the physical phenomena occurred during the interaction between the millimeter-scale cavitation bubble and the interface. On this basis, the qualitative and quantitative analyses for the cavitation bubble jet dynamics indicate that the critical value of γ for jet penetration through the interface between the water and the higher-viscosity silicone oil (interface 2, γ = 0.33) is lower than that for the interface between the water and the lower-viscosity silicone oil (interface 1, γ = 0.69). Besides, the jet generated by the cavitation bubble near interface 1 possesses a higher maximum velocity. These indicate that increased viscosity inhibits the development of the jet. The cavitation bubbles that initiate in the water near Interface 1 consistently migrate away from the interface and do not split, while those near interface 2 would migrate towards the interface at intermediate γ and would split at γ <0.91. In addition, the jet behaviours of cavitation bubbles near interface 2 at different γ are examined and classified into four types.

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来源期刊
自引率
12.00%
发文量
2374
审稿时长
4.6 months
期刊介绍: Journal of Hydrodynamics is devoted to the publication of original theoretical, computational and experimental contributions to the all aspects of hydrodynamics. It covers advances in the naval architecture and ocean engineering, marine and ocean engineering, environmental engineering, water conservancy and hydropower engineering, energy exploration, chemical engineering, biological and biomedical engineering etc.
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