毛细血管波在可混合的共同流动流体中的出现
Alessandro Carbonaro1, Giovanni Savorana1, Luca Cipelletti1,2
1Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Universitè de Montpellier, F-34095 Montpellier, France.
Physical review letters
|February 21, 2025
概括
我们在可混合流体的接口发现了毛细血管波,使得可以测量短暂的接口张力. 这一发现挑战了现有的流体动力学模型,并开辟了新的研究途径.
科学领域:
- 流体动力学 流体动力学
- 接口科学 接口科学
- 波浪现象是一种波浪现象.
背景情况:
- 毛细血管波通常在不混合的液体之间的接口上观察到.
- 了解流体接口对于各种工业和科学应用至关重要.
研究的目的:
- 研究可混合的共同流动流体的界面上的毛细血管波的存在和行为.
- 开发一种方法来测量可混合系统中的短暂界面张力.
- 探索受限流体流动中不同波动模式之间的过渡.
主要方法:
- 在共同流动的可混合液体中对毛细血管波的实验观测.
- 对波数-频率缩放的分析,以确定不同的流动模式.
- 开发一个理论模型来解释观察到的现象和测量界面张力.
主要成果:
- 证明了在可混合流体界面上的毛细血管波的存在.
- 确定了一个从惯性状态 (k∼ω^{0}) 过渡到毛细管波状态 (k∼ω^{2/3}).
- 成功测量了有效的界面张力及其在毫秒时间尺度上的快速衰变.
结论:
- 短暂的界面应力和封闭的相互作用驱动了可混合液体中的毛细血管波浪形成.
- 这项工作提供了一种新的方法,用于在前所未有的短时间内测量短暂的界面张力.
- 这些发现扩大了对可混合流体系统的界面动态的理解.
更多相关视频
相关概念视频
01:18Rise of Liquid in a Capillary Tube
1.3K
When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
1.3K
01:19Capillarity in Fluid
97
Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
97
01:22Couette Flow
183
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
183
01:27Steady Flow of a Fluid Stream
232
Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
232