This paper aims to experimentally investigate the interaction between bubble and a plate with multiple holes. The bubble is generated under the plate by underwater electric discharge method and the top surface of plate is flush with water-air interface. In order to reveal the bubble dynamics and the droplets formation caused by bubble oscillation, the interaction process is recorded by high-speed photography. Similar to the interaction between bubble and plate with a single hole, there exist two jets, the first slow jet and the second fast jet, which are caused by bubble expansion and collapse, respectively. The smaller the dimensionless distance parameter γf between bubble and plate, the higher their velocities of the droplets. In this case, the second fast jets are less likely to form and bubble takes a longer time to collapse. When γf is increased, bubble tends to split into two halves from the equator and the speed of droplets decreases. The effect of plate thickness and hole diameter on bubble dynamics and droplets formation are also investigated. Increasing the plate thickness and decreasing the hole diameter make the porous plate have a similar effect on the bubble dynamics as the rigid wall. In this case, bubble tends to migrates to the plate and the amount of liquid being squeezed out through holes is reduced. On the contrary, decreasing the plate thickness and increasing the hole diameter enhance the effect of free liquid on the bubble dynamics.

中文翻译：

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气泡与多孔板相互作用的实验研究

本文旨在通过实验研究气泡与多孔板之间的相互作用。通过水下放电方法在板下方产生气泡，并且板的顶面与水-空气界面平齐。为了揭示气泡动力学和气泡振荡引起的液滴形成，通过高速摄影记录相互作用过程。类似于气泡与单孔板之间的相互作用，存在两种射流，即第一个慢速射流和第二个快速射流，分别是由气泡膨胀和破裂引起的。气泡与板之间的无量纲距离参数γf越小，液滴的速度越高。在这种情况下，第二个快速射流不太可能形成，并且气泡需要更长的时间才能破裂。当γf增大时，气泡倾向于从赤道分裂成两半，液滴的速度降低。还研究了板厚度和孔径对气泡动力学和液滴形成的影响。增加板厚度和减小孔径使得多孔板对气泡动力学具有与刚性壁类似的影响。在这种情况下，气泡倾向于迁移到板上，并且通过孔挤出的液体量减少。相反，减小板厚度和增大孔径会增强自由液体对气泡动力学的影响。增加板厚度和减小孔径使得多孔板对气泡动力学具有与刚性壁类似的影响。在这种情况下，气泡倾向于迁移到板上，并且通过孔挤出的液体量减少。相反，减小板厚度和增大孔径会增强自由液体对气泡动力学的影响。增加板厚度和减小孔径使得多孔板对气泡动力学具有与刚性壁类似的影响。在这种情况下，气泡倾向于迁移到板上，并且通过孔挤出的液体量减少。相反，减小板厚度和增大孔径会增强自由液体对气泡动力学的影响。