Mechanical Engineering - Hydraulics and Fluid Mechanics - Discussion

1 D flow takes place in one direction only. So the correct answer is D.

The single space coordinate is usually the distance measured along the center-line (not necessarily straight) in which the fluid is flowing.

Example: The flow in a pipe is considered one-dimensional when variations of pressure and velocity occur along the length of the pipe, but any variation over the cross-section is assumed negligible.

In reality, flow is never one-dimensional because viscosity causes the velocity to decrease to zero at the solid boundaries.

It is because the motion is translation and rotational.

If pressure and velocity vary in one dimensional flow then pv remained constant as it graph shows. The straight line from origin. Usually fluid flowing in a pipe considered one dimensional flow. I hope it's something which make you understand.

I think both the option B and D are correct.

Answer B & D are correct because as it indicates one dimensional flow.

Which one is correct B or D?

1-D flow doesn't necessarily mean in a straight line, so answer should be D.

Both B & D correct because it is straight and flow in only 1 direction either x y or z.

Both Option B & D are correct because it is indicates 1 dimensional flow.