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Related Concept Videos

Surface Tension of Fluid01:22

Surface Tension of Fluid

1.2K
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...
1.2K
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.
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Contact Angle01:13

Contact Angle

17.8K
When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive...
17.8K
Viscosity01:17

Viscosity

7.0K
When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...
7.0K
Design Example: Designing Water Slide01:18

Design Example: Designing Water Slide

562
When designing a water slide, controlling the speed of water flow is crucial for rider safety while maintaining an exciting experience. As water flows down the slide, gravity causes it to accelerate, with its speed at the bottom depending on the height from which it starts. The higher the slide, the more potential energy the water has at the top, which is converted into kinetic energy as it descends, increasing its speed.
Bernoulli's principle determines the water's velocity along the slide....
562
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

32.3K
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Related Experiment Videos

Sliding of liquid drops down an inclined solid surface.

Ho-Young Kim1, Heon Ju Lee, Byung Ha Kang

  • 1Thermal/Flow Control Research Center, Korea Institute of Science and Technology, Seoul, 136-791, Korea.

Journal of Colloid and Interface Science
|November 18, 2005
PubMed
Summary

A liquid drop slides down a tilted surface beyond a critical angle. Researchers developed a scaling law predicting drop sliding velocity based on liquid properties and drop size, validated in experiments.

Related Experiment Videos

Area of Science:

  • Physics
  • Fluid Dynamics
  • Surface Science

Background:

  • Liquid drops on surfaces exhibit complex behaviors, including sliding when tilted.
  • Understanding the factors influencing drop motion is crucial for various applications.

Purpose of the Study:

  • To investigate the steady sliding velocity of liquid drops on partially wetting surfaces.
  • To develop and validate a predictive scaling law for drop sliding velocity.

Main Methods:

  • Experimental measurement of steady sliding velocities for various liquid drops.
  • Development of a scaling law incorporating physical properties, wetting characteristics, and drop size.

Main Results:

  • A scaling law was constructed to predict sliding velocity.
  • The scaling law accurately modeled experimental data for low sliding velocities and minimal drop distortion.

Conclusions:

  • The developed scaling law provides a reliable method for predicting liquid drop sliding velocity.
  • This research advances the understanding of droplet dynamics on inclined surfaces.