Shock-induced collapse of a gas bubble in shockwave lithotripsy.
Shock-induced collapse of a gas bubble in shockwave lithotripsy.
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DOI：
10.1121/1.2973229
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发表时间：
2008-10
影响因子：
2.4
通讯作者：
Colonius, Tim
中科院分区：
文献类型：
--
作者：
Johnsen, Eric;Colonius, Tim
研究了冲击波引起碎石机焦区固体表面附近预先存在的原子核的崩塌。采用高精度激波界面捕捉格式，模拟了单个气泡在碎石机脉冲作用下破裂的整个流场，并将壁面压力作为潜在损伤的指标。计算结果显示了与实验中观察到的相同的定性行为：沿脉冲传播方向形成的再入射流在坍塌时穿透气泡，最终击中气泡的远侧并产生水击激波。由于这种波的传播，对于靠近壁面坍塌的气泡，可能会获得约1 Gpa的壁面压力。壁面压力随初始离地距离和脉冲宽度的增大而减小，随脉冲幅度的增大而增大。在本文所考虑的距离范围内，气泡崩塌引起的壁面压力大于入射冲击波引起的壁面压力；这一区域可能延伸到10个初始半径。结果表明，冲击波碎石中，冲击波诱导的崩塌是一种具有较高损伤潜力的机制。
The shock-induced collapse of a pre-existing nucleus near a solid surface in the focal region of a lithotripter is investigated. The entire flow field of the collapse of a single gas bubble subjected to a lithotripter pulse is simulated using a high-order accurate shock- and interface-capturing scheme, and the wall pressure is considered as an indication of potential damage. Results from the computations show the same qualitative behavior as that observed in experiments: a re-entrant jet forms in the direction of propagation of the pulse and penetrates the bubble during collapse, ultimately hitting the distal side and generating a water-hammer shock. As a result of the propagation of this wave, wall pressures on the order of 1 GPa may be achieved for bubbles collapsing close to the wall. The wall pressure decreases with initial stand-off distance and pulse width and increases with pulse amplitude. For the stand-off distances considered in the present work, the wall pressure due to bubble collapse is larger than that due to the incoming shockwave; the region over which this holds may extend to ten initial radii. The present results indicate that shock-induced collapse is a mechanism with high potential for damage in shockwave lithotripsy.
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