Abstract
The interaction between cavitation bubbles and solid surfaces is an important issue when investigating the mechanism of collapsing cavitation bubbles. The property of a solid surface has a great effect on the inception, development and collapse of the bubbles. In this work, we aim to investigate the effect of wettability on collapsing cavitation bubbles using the multi-relaxation-time lattice Boltzmann model. First, the pseudopotential multi-relaxation-time lattice Boltzmann is improved by involving the piecewise linear equation of state and the improved forcing scheme modified by Li et al. The improved pseudopotential model is verified by the Laplace law. Next, the fluid–solid interaction in the model is employed to adjust the wettability of the solid surface. Moreover, the simulation of the collapse of the cavitation bubble near the solid surface is compared by the experiment results. Finally, the simulation of the collapsing cavitation bubbles near the solid surface with different wettability is also investigated. We find that the numerical results of the collapsing bubble are in good agreement with the experimental results. The simulation results show that the hydrophobicity of the solid surface can accelerate the cavitation bubble collapse. The hydrophilicity of the solid surface has little effect on the collapsing bubbles.
Highlights
Cavitation is a unique physical phenomenon occurring in a liquid, which is a perpetual research subject due to its specific dynamic effects [1,2,3]
While a collapsing cavitation bubble is close to a solid surface, these physical phenomena cause serious damage to the surface of the material, which is called cavitation erosion
The challenge of the simulation of the collapsing cavitation bubble near the solid surface is the stability of the lattice Boltzmann (LB) model
Summary
Cavitation is a unique physical phenomenon occurring in a liquid, which is a perpetual research subject due to its specific dynamic effects [1,2,3]. Many research papers have discussed the interaction between a surface and a cavitation bubble from different perspectives, including the roughness of the surface, interfacial wettability, and surface tension With their experiments, Li et al studied the effects of nozzle inner surface roughness on the cavitation erosion characteristics of high-speed submerged jets [10]. The challenge of the simulation of the collapsing cavitation bubble near the solid surface is the stability of the lattice Boltzmann (LB) model. Shan et al [18] studied the evolution of the collapsing cavitation bubble near a rigid boundary using LBM They established a collapsing bubble model using an improved forcing scheme based on that of Li et al [16]. The effect of hydrophilicity and hydrophobicity on the inception and the collapsing cavitation bubble is discussed
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