在开放的毛细血管通道中,自由的表面泡流
Bo Wu1, Zongyu Wu2, Yong Chen3
1College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China.
NPJ microgravity
|July 16, 2025
概括
这项关于微重力气泡流的研究发现,更高的质量质量增加了临界流速和表面稳定性. 然而,它在开放道中稍微降低了液体流量效率.
科学领域:
- 流体动力学 流体动力学
- 微重力科学 微重力科学
背景情况:
- 开放道中的泡流带来了独特的挑战,特别是在微重力条件下.
- 了解摩擦压力损失和流动行为对于太空应用至关重要.
研究的目的:
- 为微重力自由的表面泡泡流程开发一维模型.
- 研究阻力系数,质量质量和临界流速之间的关系.
主要方法:
- 利用同质流量模型来计算摩擦压力损失.
- 开发了阻力系数和质量质量之间的相关性.
- 将模型集成到计算流体动力学 (CFD) 模拟中.
- 对实验观测进行验证的模型.
主要成果:
- 在理论模型,模拟和实验数据之间实现了强大的一致性.
- 计算的临界流量,平均相对误差为4.93%.
- 观察到质量质量和临界流速之间的正相关性.
- 发现增加质量质量稳定了自由表面,但降低了液相流动效率.
结论:
- 开发的单维模型准确地预测了微重力自由的表面泡流.
- 质量质量是影响临界流速和流动稳定的关键参数.
- 这些发现增强了对微重力环境中的流体动力学的理论理解.
相关概念视频
01:19Capillarity in Fluid
393
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...
393
01:13Excess 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
01:18Rise of Liquid in a Capillary Tube
2.3K
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.
2.3K
01:22Surface Tension of Fluid
494
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
Surface tension varies...
494
01:09Turbulent 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
01:27Uniform Depth Channel Flow
168
Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
168