相关实验视频
Updated: Jul 9, 2026

16:19
High Throughput Single-cell and Multiple-cell Micro-encapsulation
Published on: June 15, 2012
18.6K
湿度驱动的孔隙填充不稳定性:微流体和数值洞察力
Lifei Yan1, Johannes C Müller2, Tycho L van Noorden3
1Department of Earth Sciences, Utrecht University, Princetonlaan 8a, Utrecht, 3584 CB, Netherlands; Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, Delft, 2628 CN, Netherlands.
Journal of colloid and interface science
|May 21, 2025
概括
湿度对多孔介质中的流体流量产生重大影响,特别是在低流速下,影响接口稳定性和压力动态. 这项研究澄清了可湿性.
科学领域:
- 多相流在多孔介质中的多相流.
- 接口动态和稳定性 接口动态和稳定性
- 表面湿透效应的影响.
背景情况:
- 接口动态,如海恩斯跳跃,对于理解多相流在多孔介质中至关重要.
- 内在表面湿度在毛孔填充事件中的确切作用以及由此产生的压力反应尚未完全理解.
- 需要进一步的研究来澄清湿度如何影响流体移动期间的接口稳定性和压力动态.
研究的目的:
- 为了评估内在表面湿度对孔隙填充事件期间界面稳定性的影响.
- 为了研究与多孔介质的湿度变化相关的压力动态.
- 为改善毛孔网络模型和理解湿度效应提供关键见解.
主要方法:
- 微流体实验是使用具有可控湿度的PDMS微型进行的 (接触角度为60°,95°和120°).
- 使用水平设置方法进行了双相流动模拟,以模拟水位移空气或Fluorinert.
- 实验涵盖了三种注射速度的毛细血管到粘性主导的流动模式,使用高分辨率成像和同步压力记录.
主要成果:
- 在较低的毛细血管数量时,可湿性显著影响了爆破压力和接口钉定,其影响在较高的毛细血管数量时会减弱.
- 由于歇斯底里,观察到明显的湿度转移,并确定了毛细血管压力屏障,与毛孔壁斜率变化有关.
- 模拟成功复制了实验趋势,证实了湿度在毛孔尺度移位现象中的关键作用.
结论:
- 内在表面湿度在决定接口稳定性和压力动态方面发挥着关键作用,特别是在低毛细管数条件下.
- 这项研究强调了多相流中的可湿性,流量状态和孔隙几何之间的复杂相互作用.
- 研究结果为改进孔网模型和提高对多种多孔介质应用中的湿度的理解提供了有价值的数据.
相关概念视频
Excess Pressure Inside a Drop and a Bubble
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.
Pore Size Distribution
In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
Adequate...
Surface Tension of Fluid
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 with...
Surface tension varies with...
Capillarity in Fluid
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...
Pressure Variation in a Fluid at Rest
In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth.
When measuring pressure at two different levels within the fluid, the difference in pressure...
When measuring pressure at two different levels within the fluid, the difference in pressure...
Typical Model Studies
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.

