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Related Concept Videos

Drag01:23

Drag

Drag is a resistive force opposing an object’s motion through a fluid, resulting from surface pressure and shear forces. It comprises two components: a perpendicular one from pressure and a tangential one from shear stress. Accurate drag calculations use pressure and wall shear stress distributions, often determined through Computational Fluid Dynamics (CFD) or wind tunnel testing. The drag coefficient, a dimensionless measure, depends on factors like shape, Reynolds number, Mach number, Froude...
Surface Tension of Fluid01:22

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...
Characteristics of Dry Friction01:21

Characteristics of Dry Friction

Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

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...
Dry Friction01:30

Dry Friction

Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
Frictional Force01:07

Frictional Force

When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...

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Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications
11:20

Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications

Published on: August 15, 2018

Toward understanding whether superhydrophobic surfaces can really decrease fluidic friction drag.

Bin Su1, Mei Li, Qinghua Lu

  • 1School of Chemistry and Chemical Technology, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 17, 2009
PubMed
Summary
This summary is machine-generated.

Superhydrophobic surfaces reduce friction drag on ship hulls by minimizing air-water interface drag. However, underwater, trapped air bubbles increase drag on superhydrophobic surfaces.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Surface Science

Background:

  • Nature inspires superhydrophobic surfaces, like water strider legs, for reduced friction.
  • Applications include ship and submarine hulls to decrease drag.
  • Understanding surface behavior at solid/liquid interfaces is crucial.

Purpose of the Study:

  • To fabricate superhydrophobic coatings on glass balls.
  • To investigate the movement of these balls on and below water.
  • To compare their performance with hydrophilic surfaces.

Main Methods:

  • Fabrication of superhydrophobic coatings using silica nanoparticles in PET film.
  • Experimental analysis of ball movement on and under water.
  • Comparison with highly hydrophilic glass balls.

Main Results:

  • Superhydrophobic balls fall slower underwater due to enhanced friction drag from trapped microbubbles.
  • Superhydrophobic balls move faster on the water surface due to reduced skin friction.
  • Increased solid/atmosphere interface area contributes to surface mobility.

Conclusions:

  • Superhydrophobic surfaces have complex effects on fluid friction, depending on the interface.
  • Underwater applications require careful consideration of trapped air effects.
  • Surface design can be optimized for specific fluid environments.