Internal Flow

There are following types of fluid flow.

I. Steady and Un-steady flow – 
a) Steady flow is defined as flow in which volume of flowing fluid remains constant at any point of flow.
b) Un-steady flow is defined as flow in which volume of flow varies at various point of flow.

II. One, Two and Three dimensional flow – 
a) One dimensional flow – One dimensional flow is defined as flow in which flow parameters expressed as functions of time and one space coordinate only.
b) Two dimensional flow – Two dimensional flow is defined as flow in which parameters expressed as functions of time and two space coordinate.
c) Three dimensional flow – Three dimensional flow is defined as flow in which hydrodynamic parameters functions of time and three space coordinates.

III. Laminar and turbulence flow – 
a) Laminar flow – Laminar flow is defined as flow in which fluid flows in parallel layer and there are no disturbance between layers.
b) Turbulence flow – Turbulence flow is defined as flow in which fluid not travel in layers and it is mixing across the tube.

IV. Uniform and Non-uniform flow – 
a) Uniform flow – Uniform flow is defined as flow in which fluid does not change magnitude of velocity and direction of flow.
b) Non-uniform flow – Non-uniform flow is defined as flow in which fluid changes its direction and velocity at any point.

V. Rotational and Irrotational flow – 
a) Rotational flow – If there are angular momentum of the fluid about any point known as rotational flow.
b) Irrotational flow – If there are no angular momentum of fluid about any point known as Irrotational flow.

VI. Compressible and Incompressible flow – 
a) Compressible flow – Compressible flow is defined as flow in which fluid changes density when force applied on it.
b) Incompressible flow – Incompressible flow is defined as flow in which fluid does not changes its density when force applied on it.