论文标题
气泡倒在多孔板附近
Bubble collapse near porous plates
论文作者
论文摘要
由于附近边界引起的不对称性，非孔边界附近气泡或蒸气气泡的崩溃针对边界。塌陷的高表面压力和剪切应力会损坏或清洁表面。诸如滤波器之类的多孔边界将与非孔边界相似，但不对称性降低，从而降低效果。先前的研究已经使用超声清洁测量了气泡对过滤器的清洁效果，但尚不清楚气泡动力学如何从根本上受到表面孔隙率的影响。我们通过研究僵持距离，孔隙率，孔径和孔形的方式来解决这个问题：气泡位移和气泡回弹大小如何影响两个崩溃的特性。我们表明，这些属性主要取决于边界的对峙距离和孔隙率，并扩展了一个先前开发的数值模型，该模型近似于此行为。使用数值模型与实验数据结合使用，我们表明气泡位移和气泡反弹大小每个崩溃到各个单曲线上。
The collapse of a gas or vapour bubble near a non-porous boundary is directed at the boundary due to the asymmetry induced by the nearby boundary. High surface pressure and shear stress from this collapse can damage, or clean, the surface. A porous boundary, such as a filter, would act similarly to a non-porous boundary but with reduced asymmetry and thus reduced effect. Prior research has measured the cleaning effect of bubbles on filters using ultrasonic cleaning, but it is not known how the bubble dynamics are fundamentally affected by the porosity of the surface. We address this question experimentally by investigating how the standoff distance, porosity, pore size, and pore shape affect two collapse properties: bubble displacement and bubble rebound size. We show that these properties depend primarily on the standoff distance and porosity of the boundary and extend a previously developed numerical model that approximates this behaviour. Using the numerical model in combination with experimental data, we show that bubble displacement and bubble rebound size each collapse onto respective single curves.
