Head Loss

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Head loss, abbreviated as \(h_l\), is a pressure loss due to the resistance of the fluid and obstructions along the way in a pipe.  There are a number of factors that affect head loss such as:

  • flow rate
  • corrosion and scale deposits
  • fittings
  • inside diameter of the pipe
  • roughness of the pipe wall
  • viscosity of the liquid
  • length of the pipe
  • straightness of the pipe

solve with Loss Coefficient Formula

\(\large{ h_l = K  \frac { v^2  } { 2 \; g }  }\)


\(\large{ h_l }\) = head loss

\(\large{ v }\) = flow velocity

\(\large{ g }\) = gravitational acceleration

\(\large{ K }\) = loss coefficient


Tags: Equations for Hydraulic Equations for Head