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相关概念视频

Rise of Liquid in a Capillary Tube01:18

Rise of Liquid in a Capillary Tube

2.9K
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.
2.9K
Capillarity in Fluid01:19

Capillarity in Fluid

768
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...
768
Joule-Thomson Effect01:21

Joule-Thomson Effect

8.9K
The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
8.9K
Heating and Cooling Curves02:44

Heating and Cooling Curves

26.4K
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
26.4K
Vaporization01:18

Vaporization

37.1K
The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...
37.1K
Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

878
Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
878

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相关实验视频

Updated: Jan 8, 2026

Thermal Measurement Techniques in Analytical Microfluidic Devices
08:29

Thermal Measurement Techniques in Analytical Microfluidic Devices

Published on: June 3, 2015

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蒸发性毛细血管在加热的微通道中升高.

Nabajit Deka1, Venugopal Venkitesh1, Soham Mukherjee1

  • 1Department of Mechanical Engineering, Indian Institute of Science Bangalore, Bengaluru 560012, India.

Langmuir : the ACS journal of surfaces and colloids
|December 16, 2025
PubMed
概括

蒸发显著改变了微通道中的毛细血管接,在接长度和通道宽度之间产生了非单调的关系. 确定了最佳的微通道尺寸,以最大限度地提高相变应用中的蒸发速度.

科学领域:

  • 热传递是一种热传递.
  • 流体动力学 流体动力学
  • 微尺度工程 微尺度工程

背景情况:

  • 微结构蒸发器中的高效液体运输对于热管理和相变应用至关重要.
  • 这些应用包括电子冷却,太阳能热淡化和热管技术.

研究的目的:

  • 为了研究蒸发对在恒定热流下微通道中的毛细血管吸管的影响.
  • 分析微通道几何 (宽度和深度) 如何影响长度和蒸发率.

主要方法:

  • 开发一个使用合质量,动量和能量保存方程的理论框架.
  • 在用水和乙醇在矩形微通道中进行吸管实验.
  • 将实验结果与理论预测进行比较.

主要成果:

  • 蒸发引入了一个非单调的行为之间的长度和微通道宽度,不像没有蒸发观察到的单调的减少.
  • 在特定的微通道深度下,峰值吸管长度因应用的热量流而变化.
  • 蒸发表面积的增加,由长和通道宽度决定,增强了蒸发速度.
  • 更深的通道具有更长的长,促进了更高的蒸发率.

结论:

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Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure

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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

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Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

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  • 微通道的几何参数可以针对不同的热流进行优化,以达到峰值蒸发率.
  • 这些发现为相变应用中的高效蒸发器提供了设计标准.
  • 实验结果验证了在各种条件下对长度的理论预测.