




版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
1、Experimental investigations on the collapse of cavity cluster in high power ultrasound fieldsLixin Bai , Weilin Xu , Yichi Zhang , Yanfu Li , Defa HuangSichuan UniversityChengdu, ChinaLixin.bai1Sichuan University Bai Lixin IntroductionMotivationCloud cavitationBackgroundNoltingk, Neppiras and Flynn
2、et al.Mrch, Wang and Brennen et al.Brennen, 20072Sichuan University Bai Lixin Objective of the paperExperiments with cavity cluster in high power ultrasound fieldshigh speed photographic observationsflow field measurements (PIV)Expected Resultsbetter understanding of the collapse of cavity clusterex
3、perimental evidence that cavity cluster collapse towards the centera physical phenomena which may be responsible for the propagation of shock wave in the cavity cluster3Sichuan University Bai Lixin ExperimentExperimental arrangement for investigation of cavity cluster4Sichuan University Bai Lixin AB
4、C DUltrasonic hornGlass flat plate(1)(2)1 mmFig.3. Cavity cluster between an ultrasonic horn and a flat plate. (1) A high-speed photograph (Photron Fastcam high-speed camera, exposure time 1 s). (2) Velocity field in the dotted line area.5Sichuan University Bai Lixin ExplanationsLauterborn and Hents
5、chel investigated the motion of cavitation bubbles in ultrasonic field by photography and found that the cavitation bubbles have a tendency to accumulate at pressure antinodes when they are sufficiently small. The primary Bjerknes force may be responsible for the motion of bubbles towards the center
6、 of cavity cluster.Chahine and Duraiswami showed that the bubbles on the outer edge of cavity cluster will tend to collapse asymmetrically and develop jets directed toward the center of the cloud. Small bubbles produced during the collapse many move with the jets, which may also be responsible for t
7、he motion of bubbles towards the center of cavity cluster.7Sichuan University Bai Lixin ExplanationsLauterborn and Hentschel investigated the motion of cavitation bubbles in ultrasonic field by photography and found that the cavitation bubbles have a tendency to accumulate at pressure antinodes when
8、 they are sufficiently small. The primary Bjerknes force may be responsible for the motion of bubbles towards the center of cavity cluster.Chahine and Duraiswami showed that the bubbles on the outer edge of cavity cluster will tend to collapse asymmetrically and develop jets directed toward the cent
9、er of the cloud. Small bubbles produced during the collapse many move with the jets, which may also be responsible for the motion of bubbles towards the center of cavity cluster.8Sichuan University Bai Lixin 12345678910abcdefghijklmnopqrstuvwxyz0.4 mmThe growth and collapse of cavitation bubbles in
10、two acoustic cycles (Photron Fastcam high-speed camera, framing rate 100000 fps, exposure time 370 ns).10Sichuan University Bai Lixin Variation of the diameters of the cavitation bubbles in Fig.5 with time in two acoustic cycles.11Sichuan University Bai Lixin ConclusionThe growth and collapse of cav
11、ity cluster in 20 kHz ultrasonic fields were investigated by high-speed photography. The motion of cavitation bubbles was strongly influenced by the acoustic streaming. Bubbles moved from the perisphere downward towards the cone tip in the axis under the ultrasonic horn and then moved downward along
12、 the axial direction. However, bubbles were found stray from the acoustic streaming upwards towards the center of the cavity cluster when the cavitation bubbles collapse. The primary Bjerknes force and jets directed toward the center of the cloud produced during the bubbles collapse may be responsible for the motion of bubbles towards the center of cavity cluster. The growth and collapse of cavitation bubbles which emerged at the same time in the same cavity cluster were recorded at 100000 fps. The relative large cavitation bubbles will growth and collapse with relative hi
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- T-ZHCA 025-2023 化妆品抗氧化人体测试方法
- 沈阳生姜种植与市场推广2025年度联合发展合同
- 2025年度自愿离婚协议书:子女抚养权及监护责任协议
- 二零二五年度创新型企业员工股权激励合同
- 2025年度金融服务违约赔偿协议范本
- 2025年度美容院美容师职业保险与福利合作协议
- 二零二五年度国际物流公司总经理聘用协议
- 二零二五年度专业冷库租赁与温控技术支持协议
- 二零二五年度物流行业劳动合同法更新及风险防范合同
- 二零二五年度心理咨询服务连锁机构心理咨询师聘用合同
- 2024至2030年中国细胞农业动向追踪与发展前景现状探索报告
- 2025初级社会工作实务考试要点速记
- 数据中心全生命周期绿色算力指数白皮书 2024
- 接触网工高级技师理论试题库及答案
- 二年级下册口算题大全(全册可直接打印)
- 初中美术备课组工作计划
- 湖北省武汉市江岸区2024年七年级下学期期末数学试题附答案
- 办公区域主要风险辨识与分级管控清单
- 2024-2034年中国藏香猪养殖行业市场深度分析及发展潜力预测报告
- 小学科学湘科版六年级下册全册同步练习含答案
- 人教版小学五年级英语上册作文专项练习题
评论
0/150
提交评论