Dynaflow, Inc., 10621-J Iron Bridge Road, Jessup, Maryland 20794, USA.
J Acoust Soc Am. 2013 Apr;133(4):1897-910. doi: 10.1121/1.4792492.
A simplified three-dimensional (3-D) zero-thickness shell model was developed to recover the non-spherical response of thick-shelled encapsulated microbubbles subjected to ultrasound excitation. The model was validated by comparison with previously developed models and was then used to study the mechanism of bubble break-up during non-spherical deformations resulting from the presence of a nearby rigid boundary. The effects of the shell thickness and the bubble standoff distance from the solid wall on the bubble break-up were studied parametrically for a fixed insonification frequency and amplitude. A diagram of bubble shapes versus the normalized shell thickness and wall standoff was derived, and the potential bubble shapes at break-up from reentrant jets were categorized resulting in four distinct zones.
本文建立了一个简化的三维（3-D）零厚度壳模型，以恢复在超声激励下厚壳封装微泡的非球形响应。通过与之前开发的模型进行比较验证了模型的有效性，然后使用该模型研究了由于附近刚性边界的存在导致的非球形变形期间气泡破裂的机制。针对固定的激励频率和幅度，针对壳厚度和气泡与固壁的间隔距离对气泡破裂的影响进行了参数研究。得出了气泡形状与归一化壳厚度和壁间隔的关系图，并对再进入射流引起的潜在气泡破裂形状进行了分类，形成了四个不同的区域。
