Influence of the nonequilibrium phase transition on the collapse of inertia nonspherical bubbles in a compressible liquid
Influence of the nonequilibrium phase transition on the collapse of inertia nonspherical bubbles in a compressible liquid
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DOI：
10.1016/j.expthermflusci.2014.07.021
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发表时间：
2015-01-01
影响因子：
3.2
通讯作者：
Takahira, Hiroyuki
中科院分区：
文献类型：
--
作者：
Jinbo, Yoshinori;Ogasawara, Toshiyuki;Takahira, Hiroyuki
在这项工作中，我们调查的冲击波惯性汽泡的相互作用，考虑在界面处的非平衡相变，流体的可压缩性，和轴对称气泡变形，包括射流穿透。我们使用水平集方法（Sussman等人，1994）和幽灵流体方法（Fedkiw等人，1999），其被改进以考虑非平衡相变（jinbo & Takahira，2012）。由于相变通过界面的热量和质量通量的数值处理实现，满足质量，动量和能量守恒定律的接口，并防止界面扩散。该方法还考虑了表面张力的影响。Sankin等人（2005）在实验条件下将改进的方法应用于激波-气泡相互作用。入射冲击波的压力波形包括具有39 MPa的峰值压力和约1 μ s的脉冲持续时间的前导压缩波，随后是具有约2 μ s的脉冲持续时间的峰值压力为-8 MPa的拖尾拉伸波，其由实验确定。在考虑非平衡相变和表面张力的情况下，成功地模拟了非球形空泡溃灭时液体射流的形成和激波的产生。通过将数值结果（例如，由气泡崩溃和气泡质心的位移产生的冲击波的强度）与从实验获得的那些进行比较（Sankin等人，2005; Klaseboer等人，2007年）。研究了入射冲击波冲击球形收缩气泡时气泡振荡相位对气泡破裂辐射冲击波的影响。研究还表明，当考虑非球形溃灭气泡界面处的非平衡相变时，与不考虑相变的情况相比，溃灭过程中气泡的最小半径减小，气泡内部空间平均压力最大值增大. (C)2014 Elsevier Inc. All rights reserved.
In this work, we investigate the shock wave-inertial vapor bubble interactions by taking the nonequilibrium phase transition at the interface, fluid compressibility, and axisymmetric bubble deformations including jet penetration into account. We use the level set method (Sussman et al., 1994) and the ghost fluid method (Fedkiw et al., 1999), which were improved so as to consider the nonequilibrium phase transition (jinbo & Takahira, 2012). The numerical treatments for heat and mass fluxes through interfaces due to the phase transition are implemented, satisfying the conservation laws of mass, momentum, and energy at the interface and preventing the interface from becoming diffused. The influence of surface tension is also considered in the method. The improved method is applied to the shock-bubble interaction under the experimental conditions by Sankin et al. (2005). The pressure waveform of the incident shock wave is comprised of a leading compressive wave with a peak pressure of 39 MPa and a pulse duration of around 1 mu s, followed by a trailing tensile wave of -8 MPa in peak pressure with a pulse duration of around 2 mu s which is determined from the experiment. The liquid-jet formation and the generation of shock waves from the collapsing nonspherical bubble are simulated successfully by taking the nonequilibrium phase transition and surface tension into account. The validity of the simulation is shown by comparing the numerical results (e.g. the intensity of the shock wave generated by the bubble collapse and displacement of the bubble centroid) with those obtained from the experiments (Sankin et al., 2005; Klaseboer et al., 2007). We investigate the effects of the phase of bubble oscillations when the incident shock wave impinges on the spherically-shrinking bubble, on the shock wave radiated from the bubble collapse. It is also shown that when the nonequilibrium phase transition at the interface of nonspherically collapsing bubbles is considered, the minimum bubble radius and the maximum space-averaged pressure value inside the bubble reached during its collapse decreases and increases, respectively, compared with those in the case without the phase transition. (C) 2014 Elsevier Inc. All rights reserved.