Simulation on evolution of an attached-wall cavitation bubble based on lattice Boltzmann method
The thermal lattice Boltzmann model was employed to explore wall wettability and liquid viscosity effects on the evolution of an attached-wall cavitation bubble.Force analysis of the contact point was carried out based on the two-particle distribution function of the heat-fluid coupling pseudo-potential LBM cavitation model.It is found that the dynamic contact angle is larger than the equilibrium contact angle throughout the evolution process for a wetting wall,resulting in a hysteresis effect during the growth stage and accelerating the contact point retraction velocity in the collapse stage.For non-wetting walls,the hysteresis effects caused by the unbalanced Young's force slow down the retraction of the contact points in the early collapse stage and accelerate the retraction in the final collapse stage because of the dramatic interface deformation.An exponential relationship exists between the microjet volume and the cosine function of the equilibrium contact angle at the collapse point.Furthermore,the increase in viscosity leads to a decrease in the jet volume at the collapse point and collapse time is delayed.
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