Suppression of cavitation inception by gas bubble injection: A numerical study focusing on bubble-bubble interaction
Suppression of cavitation inception by gas bubble injection: A numerical study focusing on bubble-bubble interaction
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DOI：
10.1103/physreve.76.046309
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发表时间：
2007-10-01
影响因子：
2.4
通讯作者：
Futakawa, Masatoshi
中科院分区：
文献类型：
--
作者：
Ida, Masato;Naoe, Takashi;Futakawa, Masatoshi
对负压下空化和气泡的动态行为进行了数值研究，以评估将气泡注入液体中对空化萌生抑制的效果。在我们之前的研究中，通过直接观察证明，当施加机械冲击时，液态汞会发生空化，这会在高功率质子束轰击液态汞的散裂中子源中造成空化损伤。在本文中，我们使用多气泡模型描述了液态汞中空化气泡动力学的数值研究，该模型考虑了空化气泡通过气泡辐射压力波与预先存在的气泡的相互作用。数值结果表明，如果汞中含有平衡半径远大于空化气泡的气泡，则空化气泡的爆炸膨胀（即空化起始）会受到注入气泡辐射的正压波的抑制，从而降低了汞中负压的大小。
The dynamic behavior of cavitation and gas bubbles under negative pressure has been studied numerically to evaluate the effect of gas bubble injection into a liquid on the suppression of cavitation inception. In our previous studies, it was demonstrated by direct observation that cavitation occurs in liquid mercury when mechanical impacts are imposed, and this will cause cavitation damage in spallation neutron sources, in which liquid mercury is bombarded by a high-power proton beam. In the present paper, we describe numerical investigations of the dynamics of cavitation bubbles in liquid mercury using a multibubble model that takes into account the interaction of a cavitation bubble with preexisting gas bubbles through bubble-radiated pressure waves. The numerical results suggest that, if the mercury includes gas bubbles whose equilibrium radius is much larger than that of the cavitation bubble, the explosive expansion of the cavitation bubble (i.e., cavitation inception) is suppressed by the positive-pressure wave radiated by the injected bubbles, which decreases the magnitude of the negative pressure in the mercury.