Mechanical Engineering - Hydraulics and Fluid Mechanics - Discussion

One dimension means there is no turbulent flow.

One-dimensional flow.

All the flow parameters may be expressed as functions of time and one space coordinate only.

The single space coordinate is usually the distance measured along the centre-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.

If however, the non-uniformity of the actual flow is not too great, valuable results may often be obtained from a "one-dimensional analysis".

The average values of the flow parameters at any given section (perpendicular to the flow) are assumed to be applied to the entire flow at that section.

ANS IS D ONLY.

Straight line is a 2d dimension.

Please tell me the correct answer.

The flow is flow in the direction of ''x'' co-ordinate. It flow contain only 'x'co-ordinate.

It is either straight or one dimensional.

Proper answer is D because if we think as straight line by considering u=f(x), it may have two components with respect to a reference point it means it represent 2d flow. So answer is D.

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

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

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