Question

The diameter of a circular pipe suddenly
increases by two times. The ration of loss of
energy to the velocity head before expansion is
​

Answer 1

Explanation:

The velocity of flow as well as the diameter of the flowing pipe are respectively doubled

So

So new head loss will be two times the initial head loss.

If the velocity of flow as well as the diameter of the flowing pipe are respectively doubled, the head loss thereafter be doubled.

Answer 2

The diameter of the circular pipe suddenly doubles with the loss ratio

Strength at head speed before expansion is as follows:

• If the flow is chaotic it can depend even on the strength of the pipe walls.

• Loss due to a collision will cause pressure to decrease in pipe length, thus increasing the amount of power that the pump must be supplied to maintain flow.

• If the flow of the first phase of the pipe is known then the flow of the second phase (part of the diameter) will be 4 times the speed of the liquid in the first phase.

• I have to add that speed is a insignificant speed in each phase as in fact the flow will be faster near the center of the pipe than near the walls.

• If it means that there is a pipe connected to another section by half the width, this is different.

• The losses resulting from the expansion flow are often greater than the loss of access, and the losses resulting from temporary changes are greater than the losses resulting from slow changes.

• Sub critical Flow Contraction & Expansion Coefficients.