What characterizes uniform flow in a fluid?

• A. Depth does not change at every section
• B. Velocity remains constant
• C. Pressure varies along the length
• D. Flow direction is constant

Answer: (A)

Uniform flow in a fluid is characterized by certain fluid dynamic principles. The key aspect of uniform flow is that the flow parameters, which can include velocity, depth, and pressure, remain consistent along a particular section of the flow stream.

When considering the option related to depth, it states that the depth does not change at every section. In uniform flow, if the flow is steady, the depth of the fluid remains constant throughout the flow path. This means that at any given cross-section of the fluid flow, the depth will be the same, leading to uniformity in how the fluid behaves.

The option regarding velocity remaining constant is also related, but uniform flow specifically ensures that parameters like depth remain constant across sections, which is fundamental to characterizing the flow. If the velocity were to change, then the flow would not be uniform, as that would imply significant variations in other properties such as depth or pressure.

The option mentioning pressure variations indicates that pressure can change along the length of a flow, which is common in non-uniform flows. In uniform flow, pressure distribution does vary, but this does not detract from the condition of uniformity as perceived in the typical sense.

Lastly, while the flow direction being constant is certainly an important aspect of