Explanation:

Fluid flow is a very complex phenomenon, and it is challenging to study its behavior in different situations. Fluid flow is characterized by various parameters such as velocity, pressure, temperature, and density, among others. Among these parameters, density plays a crucial role in determining the flow behavior of a fluid. If the density of a fluid changes from point to point in a flow region, it is called non-uniform flow. Let us understand this concept in detail.

Non-uniform flow:

Non-uniform flow refers to a flow situation where the density of the fluid changes from point to point in a flow region. In other words, the fluid properties such as density, pressure, and velocity are not constant throughout the flow region. Non-uniform flow is prevalent in practical applications, and it can occur due to various reasons such as changes in the geometry of the flow region, changes in the temperature of the fluid, and changes in the composition of the fluid, among others.

Effects of non-uniform flow:

Non-uniform flow can have significant effects on the behavior of a fluid. Some of these effects are as follows:

- Non-uniform flow can cause turbulence in the fluid, which can lead to energy losses and pressure drop.
- Non-uniform flow can cause the formation of vortices and eddies in the fluid, which can lead to the formation of dead zones and recirculation zones.
- Non-uniform flow can cause the formation of shock waves in compressible fluids, which can lead to a significant increase in pressure and temperature.

Conclusion:

In conclusion, non-uniform flow is a flow situation where the density of the fluid changes from point to point in a flow region. Non-uniform flow can have significant effects on the behavior of a fluid and can occur due to various reasons. Understanding the concept of non-uniform flow is essential in the study of fluid mechanics, and it has several practical applications in engineering.

The answer is Option D! Since, in compressible flow the fluid density changes constantly from point to point of it undergoes any change in pressure. whereas non-uniform flow is something different from Compressible, in which it undergoes change in velocity with respect to space (3d space/cross section). Hope you understood!