Dynamics and sound emission of a spherical cavitation bubble in a dilute polymer solution
Dynamics and sound emission of a spherical cavitation bubble in a dilute polymer solution
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稀聚合物溶液中球形空化泡的动力学和声发射
DOI：
10.1017/s0022112090000994
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发表时间：
1990
影响因子：
3.7
通讯作者：
G. Ryskin
中科院分区：
文献类型：
--
作者：
G. Ryskin
在适合空化的条件下(可忽略换热、牛顿粘度等的影响)，从理论上研究了聚合物添加剂对球形汽泡生长和破裂的影响。聚合物诱导应力的计算采用瞬时拉伸流动中聚合物动力学的YOYO模型(Rykin 1987A)。对得到的气泡动力学方程进行了数值求解，得到了近似解析解。研究发现，聚合物对气泡的生长没有影响，但对气泡破裂的最后阶段有影响。紧跟经典的无粘流体解后，崩塌突然停止，气泡壁面速度几乎为零。辐射声的峰值声压也降低了，声谱的高频部分也急剧减少。
The effect of polymer additive on the growth and collapse of a spherical vapour bubble is investigated theoretically, under conditions appropriate for cavitation (negligible influence of heat transfer, Newtonian viscosity, etc.). The polymer-induced stress is calculated using the yo-yo model of the polymer dynamics in transient extensional flows (Ryskin 1987a). The resulting equation of bubble dynamics is solved numerically; an approximate analytical solution is also obtained. It is found that the growth of a bubble is not affected by the polymer, but the final stage of the collapse is. After following closely the classical inviscid-fluid solution, the collapse is abruptly arrested, and the bubble wall velocity is reduced to nearly zero. The peak acoustic pressure of the radiated sound is also reduced, and the high-frequency part of the acoustic spectrum is sharply curtailed.