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# What are some examples of fluid flow ?

Last updated date: 08th Sep 2024
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Hint: A fluid is a liquid that takes on the shape of the vessel in which it is contained. Any liquid or gas can be categorised as a fluid in this context, and fluid flow is defined as "motion of a fluid subjected to unbalanced forces or stresses".

Fluid flow may be stable or unsteady, compressible or incompressible, viscous or non-viscous, rotational or irrotational, to name a few characteristics. Some of these features are related to the liquid's properties, while others are concerned with how it moves.

Flow: Stable or Unstable
Depending on the fluid's velocity, fluid flow may be steady or unsteady. The velocity of the fluid in a continuous fluid flow is constant at all times. When a flow is unsteady, the fluid's velocity will vary significantly between any two points.

Flow: Viscous or Non-viscous
Flow of a liquid can be sometimes viscous or non – viscous where viscosity is a measurement of a fluid's thickness, and viscous fluids are very gloppy fluids like motor oil or shampoo.

Examples of fluid flow:
-Passing of air over the wing of a bird, flow of river down a mountain, flow of blood through the circulatory system, fuel moving through an engine.
-Consider a water jar that has overturned. The liquid in the jar's bottom is kept up against gravity and therefore does not fall. This fluid's forces are evenly distributed. However, the water at the top of the container is unbalanced, and it is free to spill sideways and over the jar's rim, eventually reaching the ground.

Note:Fluid Flow is a part of fluid mechanics and deals with fluid dynamics. It involves the motion of a fluid subjected to unbalanced forces. This motion continues as long as unbalanced forces are applied.The rate at which a large fluid moves through a unit area is known as mass flow rate. Its formula is given as; Mass Flow Rate $= \rho AV$.