在纯Sn液体介质中,在低振幅超声波下,有狭窄的间隙的化气泡的演变行为
Guokui Li1, Yu Zhao1, Jiaqi Li1
1School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Ultrasonics sonochemistry
|August 30, 2023
概括
这项研究模拟了液态锡中的空洞气泡,揭示了它们在金属表面上的方向移动. 增加的压力或减少的间隙大小会增加泡的运动,并且由于被限制而改变形状.
科学领域:
- 材料科学 材料科学 材料科学
- 流体动力学 流体动力学
- 声学 声学 在声学方面
背景情况:
- 化气泡在封闭的液体金属环境中形成并独特地表现.
- 了解泡动力学对于超声波接和脱气等过程至关重要.
- 纯锡 (Sn) 是接应用中相关的材料,在这种现象发生时.
研究的目的:
- 为了数值建模和研究狭间隙纯锡液体介质中的化气泡的行为.
- 分析压力振幅和间隙大小对泡动态的影响.
- 为了阐明在窄间隙接接层中的超声波脱气机制.
主要方法:
- 建立了一个二维可压缩的多相流量模拟模型.
- 研究了压力振幅和间隙大小对气泡形状,大小和位置的影响.
- 分析流体压力和速度场,以了解超声波振动效应.
主要成果:
- 化气泡在非线性和近壁振荡阶段后,在金属基板上表现出稳定,定向的运动.
- 增加的压力振幅或减少的间隙大小加快了泡运动,并导致圆形变形.
- 在接接的中心有较强的振动会促进泡向外移动.
- 最大水平气泡位移在0.002秒内达到1.13毫米.
结论:
- 狭间接中的化气泡动力学可以通过压力振幅和间隙大小来控制.
- 这项研究提供了对液体金属中的超声波脱气机制的见解.
- 数字模拟为了解和优化接过程提供了宝贵的工具.
相关概念视频
01:28Standing Waves in a Cavity
955
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
955
01:09Deriving the Speed of Sound in a Liquid
535
As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave...
The speed of sound in fluids can be derived by considering a mechanical wave...
535
01:13Excess Pressure Inside a Drop and a Bubble
1.7K
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.
1.7K
01:16Shock Waves
2.1K
While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
2.1K
01:23Steady, Laminar Flow in Circular Tubes
250
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
250
01:17Steady, Laminar Flow Between Parallel Plates
231
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
231