This page calculates the head loss of a fluid at an abrupt pipe entrance. The head loss coefficient at an abrubt duct exit is 1.0.

The head loss *h _{L}* can be
calculated as:

h* _{L}* = k

Where *k*_{loss}
is the head loss coefficient, *u _{m}* is the flow velocity in the pipe, and

**References**

Idel'chik, I E. and Fried, Erwin., *Flow Resistance, a
Design Guide for Engineers*, Taylor & Francis, Washington D.C. 1989. p
349.