Bio-inspired apparatus to produce luminescent cavitation in a rigid walled chamber

A mechanical device inspired by the sudden rotational motion of the pistol shrimp claw was developed. The apparatus consists of a limb with a V-shaped end, which fits into a socket forming a cylindrical compression chamber. Air bubbles of different sizes and in different positions inside the chamber were seeded to study their shape evolution in liquids when subjected to pressure pulses induced by the limb closure. Non-spherical shape dynamics, micro jets and photon emission were observed during bubble collapse. The proposed mechanism represents a low-cost technology useful in the study of cavitation near rigid boundaries of diverse geometries. Experimental data on limb motion and bubble dynamics were obtained by processing videos taken with a high-speed camera. Light signals were acquired with a photomultiplier and force signals were acquired using PVDF piezoelectric sensors. Numerical data describing limb motion were obtained by numerically solving a torque balance model, while radial dynamics curves were obtained by solving the Rayleigh-Plesset equation. Data files are presented in two types of extension .opj (and .opju) that can be opened and analyzed in OriginPro software and also .xlsx that can be opened and analyzed with Microsoft Excel. The name of each file corresponds to the Figure number used in the article. Two notebooks created in Mathematica are made available. One of them was used to simulate the dynamics of clamp closure and the other to estimate the pressure pulse generated during limb closure. The versions of these files are not the most up-to-date, but they contain all the information necessary to reproduce the results presented in the article.本研究开发了一种受手枪虾螯突然后转运动启发的机械装置。该装置包含一个末端呈V形的肢体，该肢体可嵌入凹槽以形成圆柱形压缩腔。我们将不同尺寸、不同位置的气泡引入腔体内，以探究当肢体闭合引发压力脉冲时，气泡在液体中的形态演化过程。气泡坍塌过程中，观察到非球形形态动力学、微射流及光子辐射现象。本研究提出的装置机制属于低成本技术，可用于探究不同几何形状刚性边界附近的空化现象。 通过处理高速相机拍摄的视频，获取肢体运动与气泡动力学相关的实验数据；利用光电倍增管采集光信号，并采用聚偏氟乙烯（PVDF）压电传感器采集力信号。 通过数值求解扭矩平衡模型，得到描述肢体运动的数值数据；通过求解瑞利-普莱赛特（Rayleigh-Plesset）方程，得到径向动力学曲线。 数据集包含两类格式的数据文件：扩展名为.opj（及.opju）的文件可在OriginPro软件中打开并分析，扩展名为.xlsx的文件可通过Microsoft Excel打开与分析；每个文件的文件名与论文中对应图表的编号一致。 本数据集还提供两份基于Mathematica编写的笔记本文件：其中一份用于模拟夹合动作的动力学过程，另一份用于估算肢体闭合过程中产生的压力脉冲。尽管这两份文件并非最新版本，但已包含复现论文中所有结果所需的全部信息。