Loss of head at submerged discharge

[foo9008]

Homework Statement

in the notes , author said that the velocity within it is negligible? does the author mean the water velocity in the tank ?
so the velocity (v^2)/2g in the 4.24 means the velocity in the pipe ?

Homework Equations

The Attempt at a Solution

 

[haruspex]

in the notes , author said that the velocity within it is negligible? does the author mean the water velocity in the tank ?
so the velocity (v^2)/2g in the 4.24 means the velocity in the pipe ?

Yes, the author means that the inflowing water effectively becomes stilled by the water in the tank.
And yes, as the diagram shows, v is the inlet velocity.

 

[foo9008]

Yes, the author means that the inflowing water effectively becomes stilled by the water in the tank.
And yes, as the diagram shows, v is the inlet velocity.

why the water will become ' stilled' ?

 

[haruspex]

why the water will become ' stilled' ?

Water has some viscosity. It becomes mixed with the water in the tank, sharing its momentum.