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Fluid Friction


You could see a man dives, fishes and even turtles swims, a plane, helicopter and birds fly in air. Here in all these examples the fluid layer separates the body from the surface. This illustrates the fluid friction very clearly. Lets see the basics behind it.

What is Fluid Friction?

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Pour some fluid in a plate and tilt it. It tends to flow when the weight component along the surface in static condition overcomes the friction of fluid and hence known as Static Fluid Friction. Even the tilt angle of each fluid type varies when it has to overcome the static friction. If the viscosity or the static fluid friction is more, greater will be the tilt angle. The Fluid friction even offers the resistance to shear force.

In all above illustrations, there is a friction that exists when contacting surfaces are separated by a film of fluid. There comes the term fluid friction. Basically, it is the type of friction experienced when a layer of fluid separates two surfaces and the layer of fluid move over each other at different speeds.

Fluid Friction Definition

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The Fluid Friction is a phenomena where the fluid offers resistance between the movement of two surfaces. If these offers the high resistance they are called high viscous or in common term called as 'greasy'. There are of two types :
The friction that occurs before the motion is called static friction whereas that occurs after the motion takes place is dynamic friction or kinetic friction.

Examples of Fluid Friction

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Here are some illustrations on fluid friction you can go through it:
  1. Suppose a wet surface acts between the glass plates the plates get stick with each other and the bottom plate comes with top once you pick top plate.
  2. Lubricating the machines parts in sewing machine interlocks the two layers that leads to smooth motion
  3. Lubricating the door hinges to avoid creaking sounds. This leads to smooth function of door hinges.
  4. When you drop an object in a fluid, the splash of fluid is all due to the force of buoyancy of fluid that tells about fluid friction of fluid.