在侵蚀性状态下修改了洞腔泡崩,使用了表面条结构
Jiajun Cui1, Fabian Reuter2, Zibo Ren1
1State Key Laboratory of Hydroscience and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China.
Ultrasonics sonochemistry
|July 6, 2025
概括
引入一条细条边界结构改变了化气泡的崩,创造了不同的制度. 这项研究探讨了不对称性.
科学领域:
- 流体动力学 流体动力学
- 声学 声学 在声学上
- 材料科学 材料科学 材料科学
背景情况:
- 洞穴泡在表面附近的崩会导致严重的侵蚀,特别是在轮机中.
- 在非球形崩期间的冲击波能量度被怀疑是侵蚀机制.
- 修改边界结构提供了一种减轻洞穴侵蚀的策略.
研究的目的:
- 为了研究通过细条引入不对称性如何影响洞穴气泡动态.
- 量化分析不对称性对冲击波自我聚焦的影响.
- 了解边界结构在控制化泡崩中的作用.
主要方法:
- 利用激光诱导的空心气泡和一条细长的棒作为一个破坏对称性的边界结构.
- 使用两个高速摄像头对泡崩动态进行定量观测.
- 分析了泡形态,动态和冲击波聚焦特征.
主要成果:
- 确定了两个不同的崩模式:岛桥和不对称的.
- 观察到泡动力学和几何学的明显趋势,泡结构距离有所变化.
- 具有特征的崩位置和传播速度,影响冲击波聚焦.
结论:
- 边界结构的不对称性显著影响了化气泡的崩和冲击波的聚焦.
- 该研究提供了设计表面微观结构的洞察力,以减轻洞穴或能量度.
- 这些发现为涉及洞穴的工程应用提供了潜在的方法.
相关概念视频
Excess Pressure Inside a Drop and a Bubble
2.2K
The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
2.2K
Turbulent Flow: Problem Solving
191
Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures...
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures...
191
Typical Model Studies
443
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
443
Rapidly Varying Flow
144
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
144
Design Example: Creating a Hydraulic Model of a Dam Spillway
315
Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
315


