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

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

Where:

$$\large{ h_l }$$ = head loss

$$\large{ v }$$ = flow velocity

$$\large{ g }$$ = gravitational acceleration

$$\large{ K }$$ = loss coefficient