Mechanical Engineering - Hydraulics and Fluid Mechanics - Discussion

Option B is not correct because flow in a straight line is called laminar flow.

Option D is correct.

B, right because we considered fluid is non viscous in nature and PV graphs show straight line, PV ' constant.

No, the One-dimensional flow has nothing to do with the straight line or curve. If the entire flow parameter requires only 1 independent variable to completely specify the flow then it is called one dimensional.

I agree @Aman.

The one-dimensional flow does not necessarily mean a straight line.

Suppose an ant is moving in a zig-zag path. If we look at the path of an ant from above we will observe ant is moving in a zig-zag path which is lying on a 2d plane but if you ask the ant what is the path of your motion? The ant will definitely say that I am is moving in a straight line. Because ant will not be able to observe its motion from above. As soon as the ant takes turns on its path its X coordinate will also take a turn with it (ant). So if you are moving in a zig-zag path you can not say that you are moving in 2d. It will be ond D only.

Option D is correct. Option B is the subset of option D. Because a Straight Line path and a zig-zag path both can be one Dimension.

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

Ref: R.S KHURMI & J.K.GUPTA.

1-dimensional flow is when velocity is in 1 direction only.

Ref: R.K. BANSAL.

@Zxcv, here the question asked from kinematics.

So we can't consider the forces acting on it.

BUT you consider sheer force. So it is wrong.

And your explanation is correct to incase of dynamics.

A one-dimensional flow is one which streamlines takes place in straight lines not flow takes place in straight lines hence option D is right.

Option D is correct.