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Related Concept Videos

Surface Tension of Fluid01:22

Surface Tension of Fluid

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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...
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Viscosity01:17

Viscosity

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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.
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Surface Tension, Capillary Action, and Viscosity02:57

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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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Boundary Layer Characteristics01:18

Boundary Layer Characteristics

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When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
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Cohesion01:07

Cohesion

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Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
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Contact Angle01:13

Contact Angle

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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.
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A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction
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Liquid metal droplets bouncing higher on thicker water layer.

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Surface science

Background:

  • Liquid metal (LM) is crucial for flexible electronics, soft robots, and chip cooling due to its conductivity and flexibility.
  • An oxide layer on LM hinders mobility by causing adhesion to substrates.
  • Understanding LM droplet behavior is vital for advanced applications.

Purpose of the Study:

  • To investigate the unusual rebound phenomenon of liquid metal droplets on a water layer.
  • To elucidate the mechanisms behind the observed negligible adhesion and increased restitution coefficient.
  • To explore potential applications in fluid control and droplet dynamics.

Main Methods:

  • Experimental observation of liquid metal droplet impact on water layers of varying thicknesses.
  • Analysis of droplet rebound using high-speed imaging.
  • Theoretical modeling to explain the role of the lubrication film and capillary pressure.

Main Results:

  • Liquid metal droplets exhibit complete rebound from water layers with minimal adhesion.
  • The restitution coefficient increases with the water layer thickness.
  • A low-viscosity water lubrication film prevents direct droplet-solid contact, reducing energy dissipation.

Conclusions:

  • The complete rebound is attributed to a trapped water lubrication film and negative capillary pressure.
  • Spontaneous water spreading on the liquid metal droplet influences the restitution coefficient.
  • Findings enhance the understanding of complex fluid droplet dynamics and offer new avenues for fluid control.