Experimental and numerical investigations of the bubble collapse at the center between rigid walls
Experimental and numerical investigations of the bubble collapse at the center between rigid walls
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DOI：
10.1088/1742-6596/656/1/012031
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发表时间：
2015-12
期刊：
影响因子：
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通讯作者：
T. Ogasawara;N. Tsubota;H. Seki;Y. Shigaki;H. Takahira
中科院分区：
文献类型：
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作者：
T. Ogasawara;N. Tsubota;H. Seki;Y. Shigaki;H. Takahira
研究了刚性壁面中心气泡的崩塌行为及其对壁面的影响。气泡的破裂取决于间隙宽度与最大气泡半径w*的比值。当2.66 < w* < 1.17时，当w*减小到2.5时，发生分裂坍缩；气泡在坍塌过程中在间隙中心分裂成两个，每个气泡在壁面附近坍塌，并向更近的壁面平移。w*进一步降低到1.4会导致中性崩溃，气泡在间隙中心崩溃，而不会分裂和平移。通过考虑最大气泡体积时的气泡形状，成功地模拟了这些坍塌行为。由于w*的减小，破裂行为由劈裂破裂转变为中性破裂，壁面上的峰值压力减小，表明中性气泡在更薄的间隙内破裂，壁面损伤减小。
The collapsing behavior of a bubble generated at the center of the rigid walls and its effect on the wall are investigated experimentally and numerically. The bubble collapse drastically depends on the ratio of the gap width to the maximum bubble radius w*. In case of 2.66 < w* < 1.17, by the decrease in w* to 2.5, the splitting collapse occurs; the bubble splits into two at the center of the gap during collapse and each bubble collapses near the wall with the translation toward nearer wall. Further decrease in w* to 1.4 causes neutral collapse where the bubble collapses at the center of the gap without splitting and translation. These collapsing behaviors are successfully simulated by considering the bubble shape at the maximum bubble volume. The peak pressure on the wall decreases by the transition of the collapsing behavior from the splitting collapse to the neutral collapse due to the decrease in w*, which indicates the wall damage reduction due to the neutral bubble collapse in thinner gap.