Uniform and Non-uniform Flows
The flow is defined as uniform flow when in the flow field the velocity and other hydrodynamic parameters do not change from point to point at any instant of time.
For a uniform flow, the velocity is a function of time only, which can be expressed in Eulerian description as
Implication:
changes with time − unsteady uniform flow OR
does not change with time − steady uniform flow.
When the velocity and other hydrodynamic parameters changes from one point to another the flow is defined as non-uniform.
Important points:
1. For a non-uniform flow, the changes with position may be found either in the direction of flow or in directions perpendicular to it.
2.Non-uniformity in a direction perpendicular to the flow is always encountered near solid boundaries past which the fluid flows.
Reason: All fluids possess viscosity which reduces the relative velocity (of the fluid w.r.t. to the wall) to zero at a solid boundary. This is known as no-slip condition.
Four possible combinations
|
Uniform and Non-uniform Flows
2:40 PM
0
Tags
Feel free to write