Page 122 - ebook fluid mechanics_finalize

FLUID MECHANICS

Special case: if the entrance of a pipe line from a reservoir is sharp (no rounded or bell-

mouthed) it is equivalent to a sudden contraction from a pipe of infinite size to that of the

pipe line. The loss of head at sharp entrance is

1  v 2 
Loss of head at sharp entrance, hC =  


2  2 g 

v = velocity in the pipe

111