Influence of Nonspherical Bubble Collapse on Decomposition and Luminescence
非球形气泡破裂对分解和发光的影响
基本信息
- 批准号:15560150
- 负责人:
- 金额:$ 2.3万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2003
- 资助国家:日本
- 起止时间:2003 至 2004
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
We calculated the collapse of toroidal bubbles using the boundary element method combined with the finite volume method by considering the van der Waals equation of state for the internal gas. It was shown that the thermal boundary layer becomes thin and the maximum internal pressure becomes higher than that of ideal gas due to the real gas effect. We also showed the physical meaning of the pressure terms in the Rayleigh-Plesset equation that is used to calculate the radial motion of bubbles in an averaged equation for cavitating flows. Also, we have improved the Ghost Fluid Method(GFM) by correcting velocities, pressure and density at boundary nodes using the Riemann solutions to avoid numerical oscillations near the gas-liquid interface. We have succeeded in capturing the sharp interface for the shock-air bubble interaction in water by using the improved GFM coupling with the hybrid particle level set method. The results showed that the correction of boundary nodes improves the numerical stability of the GFM for compressible gas-liquid flows. It is effective to give the tangential velocity, which is not obtained from the Riemann solution, by the velocity at the nearest real node to the interface.Small focusing ultrasonic oscillators were devised. We tested two kinds of piezoelectric ceramics whose radius of curvature were 8 mm and 5.77 mm. It was shown that the better focusing is realized by the ceramics with the long radius of curvature. The experimental and numerical results showed that the position of focusing is moved toward the ceramics due to the influence of the edge of the ceramics. We also investigated the influence of gas diffusion on the stability of microbubbles. It was shown that the decrease of the surface tension due to the compression of the surface area at the maximum surfactant concentration stabilize the microbubbles.
考虑内部气体的范德华状态方程,采用边界元法与有限体积法相结合的方法计算了环面气泡的坍缩。结果表明,由于实际气体效应,热边界层变薄,最大内压高于理想气体。我们还展示了用于计算空化流平均方程中气泡径向运动的瑞利-普莱塞特方程中压力项的物理意义。此外,我们改进了幽灵流体法(GFM),利用黎曼解修正边界节点的速度、压力和密度,以避免气液界面附近的数值振荡。利用改进的GFM耦合和混合粒子水平集方法,成功地捕获了水中激波-气泡相互作用的尖锐界面。结果表明,边界节点的修正提高了可压缩气液流动GFM的数值稳定性。用离界面最近的实节点处的速度给出切向速度是有效的,切向速度不是由黎曼解得到的。设计了小型聚焦超声振荡器。我们测试了曲率半径分别为8 mm和5.77 mm的两种压电陶瓷。结果表明,曲率半径较长的陶瓷具有较好的聚焦效果。实验和数值结果表明,由于陶瓷边缘的影响,聚焦位置向陶瓷方向移动。我们还研究了气体扩散对微泡稳定性的影响。结果表明,在最大表面活性剂浓度下,表面张力的减小是由于表面面积的压缩造成的。
项目成果
期刊论文数量(68)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
実在気体効果が非球形気泡の崩壊に及ぼす影響
真实气体效应对非球形气泡破裂的影响
- DOI:
- 发表时间:2004
- 期刊:
- 影响因子:0
- 作者:H.Takahira;S.Yuasa;Hiroyuki Takahira;西田陽祐;Hiroyuki Takahira;湯浅 伸哉;村瀬吉則;高比良裕之;村瀬吉則
- 通讯作者:村瀬吉則
Hiroyuki Takahira: "Influence of Gas Diffusion on the Stability and Merger of Microbubbles"Proc.5th Int.Symp.on Cavitation (CAV2003). CD-ROM(OS-2-1-004). (2003)
Hiroyuki Takahira:“气体扩散对微泡稳定性和合并的影响”Proc.5th Int.Symp.on Cavitation (CAV2003)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Numerical Analysis of Collapsing Nonspherical Bubbles Considering Real Gas Effects
考虑实际气体效应的非球形气泡破裂的数值分析
- DOI:
- 发表时间:2004
- 期刊:
- 影响因子:0
- 作者:Y.Murase;H.Takahira
- 通讯作者:H.Takahira
A Remark on the Pressure Terms in the Rayleigh-Plesset Equation for Cavitating Flows
空化流Rayleigh-Plesset方程中压力项的注解
- DOI:
- 发表时间:2004
- 期刊:
- 影响因子:0
- 作者:Y.Murase;H.Takahira;H.Takahira
- 通讯作者:H.Takahira
Some Applications of Laser Trapping on the Dynamics of Microbubbles
激光捕获在微泡动力学中的一些应用
- DOI:
- 发表时间:2004
- 期刊:
- 影响因子:0
- 作者:H.Takahira;T.Nagata;T.Hozumi
- 通讯作者:T.Hozumi
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TAKAHARA Hiroyuki其他文献
TAKAHARA Hiroyuki的其他文献
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{{ truncateString('TAKAHARA Hiroyuki', 18)}}的其他基金
Analysis of the regulation of plant immune responses operated by fungal effectors.
真菌效应器对植物免疫反应的调节分析。
- 批准号:
25850029 - 财政年份:2013
- 资助金额:
$ 2.3万 - 项目类别:
Grant-in-Aid for Young Scientists (B)