Collapsing bubbles in complex geometries

空化泡的溃灭是自由表面流动中最剧烈的现象之一。在这种坍缩中，能量的集中足以损坏船舶螺旋桨，但也可以用来清洁表面或增强化学反应。气泡破裂的方式取决于气泡附近材料的类型和形状。该项目的目的是通过研究复杂的周围几何形状对单个气泡崩溃的影响，来解决这种能量聚焦机制的一个基本方面。从长远来看，这些发现可以应用于更有效地利用气泡，例如在复杂3D打印结构的超声清洗中。在这个项目中，您将使用各种实验技术，包括激光诱导空化，高速成像和粒子图像测速。候选人应具有物理科学或工程背景，并对流体动力学感兴趣。

One of the most violent free surface flows is the collapse of a cavitation bubble. The focusing of energy in such a collapse is strong enough to damage ship propellers, but can also be used to clean surfaces or enhance chemical reactions. The way that a bubble collapses depends on the type and the shape of the materials in the vicinity of the bubble. The aim of this project is to address a basic fundamental aspect of this energy focusing mechanism, by investigating the influence of complex surrounding geometries on the collapse of single bubbles. These findings can in the longer term be applied to make more efficient use of bubbles, for example in the ultrasonic cleaning of complex 3D-printed structures.In this project you will use a variety of experimental techniques, which include laser-induced cavitation, high-speed imaging, and particle image velocimetry. The candidate should have a background in physical sciences or engineering and have an interest in fluid dynamics.