Thanks in advance, can someone explain Steady,Non steady, Uniform and Non Uniform flow and provide some example for each.

• Have you got mechanics of Fluids by Massey? Dec 4 '18 at 21:52
• Standard dictionaries define these. Please show the research you have done. A good place to start is this bunch of videos - National Committee for Fluid Mechanics Films (NCFMF) Dec 5 '18 at 0:48

The steady state refers to any phenomenon that is independent of time. Mathematically it means:

$$\frac{\partial v}{\partial t} =0$$.

Here is an example:

Consider a fixed point in the atmosphere and an observer on an airplane moving with constant velocity then he sees the flow as steady the flow doesn't change as the observer approaches the point, however if the observe change his coordinate system, for instance an observer somewhere on the earth which is not moving, observes an unsteady flow pattern, or the flow pattern at the fixed point changes as the airplane approaches that point.

So the concept is not absolute it is coordinate dependent. Whenever an object moves through a fluid with a constant velocity, the flow field may be transformed from an unsteady flow to a steady flow by selecting a coordinate system that is fixed with respect to the moving object.

Uniform flow doend't accelerate or delay . Mathematically:

$$\frac{\partial v}{\partial s}= 0$$.