Fluid-solid coupling model of micro-jet impact from acoustic cavitation bubble collapses near a wall and pit inversion analysis

YE Linzheng; ZHU Xijing; WANG Jianqing

doi:10.11883/bzycj-2018-0118

Volume 39 Issue 6

Jun. 2019

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YE Linzheng, ZHU Xijing, WANG Jianqing. Fluid-solid coupling model of micro-jet impact from acoustic cavitation bubble collapses near a wall and pit inversion analysis[J]. Explosion And Shock Waves, 2019, 39(6): 062201. doi: 10.11883/bzycj-2018-0118

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YE Linzheng, ZHU Xijing, WANG Jianqing. Fluid-solid coupling model of micro-jet impact from acoustic cavitation bubble collapses near a wall and pit inversion analysis[J]. Explosion And Shock Waves, 2019, 39(6): 062201. doi: 10.11883/bzycj-2018-0118

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Fluid-solid coupling model of micro-jet impact from acoustic cavitation bubble collapses near a wall and pit inversion analysis

doi: 10.11883/bzycj-2018-0118

School of Mechanical Engineering, North University of China, Taiyuan 030051, Shanxi, China

Received Date: 2018-04-10
Rev Recd Date: 2018-05-03
Publish Date: 2019-06-01

Abstract

Abstract

Bubble collapse near a wall will generate strong micro-jet in a liquid environment under ultrasonic field. To explore the fluid-solid coupling effect of micro-jet impinging on a wall, hydrodynamics and impact dynamics were employed, and the J-C rate correlation material constitutive model was applied, then a three-dimensional fluid-solid coupling model of micro-jet impact on a wall was established and analyzed numerically based on the Euler-Lagrange coupling method. Finally, an ultrasonic cavitation test and inversion analysis based on the theory of the spherical indentation test were conducted for validation. Pit depth is decided jointly by micro-jet velocity and micro-jet diameter, and increases with their increases, while the ratio of diameter to depth of a pit is negatively correlated with the micro-jet velocity. Wall pressure distribution is mostly symmetric and the maximum pressure appears on the edge of micro-jet impinging. The maximum wall pressure clearly increases with the micro-jet velocity. The increase of the pressure can lead to the increase of the shock wave intensity and velocity in liquid, which can reach 682 MPa and 2 435 m/s, respectively, when the micro-jet velocity is 479 m/s. Micropits appearing on the material surface impacted by micro-jet were demonstrated by ultrasonic cavitation test, and the pits’ ratio of diameter to depth vary from 16 to 68. Inversion analysis results indicate that equivalent stress, equivalent strain of the pit and impact strength, velocity of the micro-jet are closely related with the ratio of diameter to depth of the pit. When it is 16−68, the micro-jet impingement strength is 420−500 MPa, and the corresponding micro-jet velocity is 310−370 m/s. Test and inversion analysis results are consistent with the theoretical analysis, which verifies the rationality and accuracy of a fluid-solid coupling model considering the J-C rate correlation material constitutive model and inversion analysis method. This work provides a theoretical reference for the control of cavitation intensity and micro-jet velocity in the following engineering applications.
- ultrasonic cavitation,
- micro-jet impact,
- fluid-solid coupling,
- inversion analysis

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References(29)

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