Creation of a cluster of cavitation bubbles using diffusing droplets and its extension to sonoluminescence

使用扩散液滴创建空化气泡簇及其对声致发光的扩展

基本信息

批准号：
16560138
负责人：
HAYASHI Shigeo
金额：
$ 2.37万
依托单位：
The University of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

The purpose of the present research program is to investigate experimentally how a viscous droplet, injected into water, plays a role in creating many bubbles, which may eventually result in a single bubble. The process is complicated and difficult to manage, as noted by Naser Harba. More fundamental investigation has thus been carried out.1)Hydrodynamical behavior of a viscous diffusing droplet.First, with no ultrasound droplets of glycerol were let fall from a position 5 mm above the surface, but the droplets floated as long as its density was heavier than the solution by less than 0.02 g/cm^3. Diffusion may have helped to gain the buoyancy. Next, if ultrasound was applied, the droplets evaded the position where bubbles were otherwise trapped, suggesting that Naser Harba painstakingly observed those diffusing processes.2)Analysis of light-scattering data and related subjects.Mie-scattering data for multiple bubbles formed from an injected glycerol droplet were analyzed, with the assumption that bubbles obeyed the Rayleigh-Plesset equation. It turned out that the scattering data were affected by saturation due to light. Computer programs were developed for analysis of bubbles and drops and for jittering of pulses on the digital oscilloscope, which may mislead to false time-train signals.3)Sonoluminescence from concentrated sulfuric acid.Sulfuric acid is also viscous, and sonoluminescence from it was investigated at several frequencies.4)Numerical simulation of Moire patterns for diffusing dropletsMoire patterns were produced for a distribution of refractive index, which might mimic droplets isotropically diffusing within water.

本研究计划的目的是通过实验研究将粘性液滴注入水中，在创建许多气泡中起着作用，这最终可能导致单个气泡。正如纳瑟·哈尔巴（Naser Harba）指出的那样，这个过程很复杂且难以管理。因此，已经进行了更多的基本研究。1）粘性扩散的液滴的流体动力学行为。首先，没有超声液滴的甘油液的超声液滴从表面上方5 mm的位置掉落，但是只要液滴比溶液重量比0.02 G/CM^3。扩散可能有助于获得浮力。接下来，如果应用了超声，则液滴避免了其他被捕获的气泡的位置，这表明纳瑟尔·哈巴（Naser Harba）艰苦地观察了那些扩散的过程。2）分析光散射数据和相关主题的分析。从注射的甘油液滴中形成的多个气泡的散布数据，并通过将甘油液滴进行了分析，并带有bubleble bubleble obeyed bubeyed bubeydigh-oseyed rayed rayed rayed rayed rayed rayed rayed rayed rayed rayed rayed。事实证明，散射数据受光导致的饱和影响。开发了计算机程序来分析气泡和滴剂以及数字示波器上的脉冲抖动，这可能会误导到虚假的时间训练信号。3）浓硫酸发光的声明发光。硫酸也是粘性的粘性，并且在几种频率上对其进行了悬浮量的速度脱落。折射率的分布，这可能模仿在水中各向同性散布的液滴。