A fluid in motion is said to be flowing.

We can use streamlines to visualise flow of fluids (they actually are the just the field lines to the velocity field) , similar to how field lines are used to visualise Electric Fields and Magnetic Fields.

The density of streamlines in a fluid is proportional to the velocity of the fluid.

Definition

Formula

Flow of a fluid:

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Properties

Laminar/Turbulent Flow

A fluid flowing at a constant velocity everywhere is said to have a laminar flow.

Conversely, a fluid which doesn’t have constant smooth velocity everywhere is said to have turbulent flow.

Compressible/Incompressible Flow

A fluid retains it’s density while flowing. For an incompressible fluid, this means that the volume of the fluid also remains the same.

Rotational/Irrotational Flow

In rotational flow, each of the fluid particles undergo rotational torque as they move. In irrotational flow, this is absent.#tosee

Ideal Fluid

An ideal fluid is one defined to be incompressible. It’s flow is defined to be laminar, incompressible, nonviscous and irrotational !