Abstract Numerical simulations of the vapor bubble collapse near the micro fiber immersed in a subcooled liquid allow us to propose the mechanism of formation of high velocity liquid jet previously observed in experiments. It is shown that spherical symmetry breaking of the velocity field near the fiber creates axisymmetric radially converged water flow resulting in appearance of the cumulative jet. Numerical simulations demonstrate that physical mechanism of jet formation is mainly determined by bubble surface dynamic and is irrespective to the processes driving bubble shrinking. Dependency of the jet velocity on time as well as effect of fiber thickness and initial vapor bubble radius on jet intensity are studied. It is found that optimal fiber thickness at which the jet is the most powerful exists. This optimal value is not universal but depends on initial vapor bubble radius.

中文翻译：

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浸没在液体中的微纤维附近气泡破裂后高速射流形成的机制

摘要 浸没在过冷液体中的微纤维附近的蒸汽气泡坍塌的数值模拟使我们能够提出先前在实验中观察到的高速液体射流的形成机制。结果表明，纤维附近速度场的球对称破坏会产生轴对称的径向会聚水流，从而导致累积射流的出现。数值模拟表明，射流形成的物理机制主要由气泡表面动力学决定，与驱动气泡收缩的过程无关。研究了射流速度对时间的依赖性以及纤维厚度和初始汽泡半径对射流强度的影响。发现存在射流最强的最佳纤维厚度。