Mechanical Engineering - Hydraulics and Fluid Mechanics - Discussion

Which one is correct B or D?

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

I think both the option B and D are correct.

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.

It is because the motion is translation and rotational.

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.

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

Answer is D because straight line does not mean that it is flowing only in one direction.

A flow in which the streamlines of its moving particles are represent by straight line is called one dimensional flow.

Dear @Arun you are wrong.

One dimension does not mean like only in one space coordinates direction(as you say in x).

The direction may change from x to y coordinate direction but it is single.