# Hydraulic Diameter of a Square Tube

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Hydraulic diameter, abbreviated as $$d_h$$, of a square tube is when the flow is within the tube.

### Hydraulic Diameter of a Square Tube FORMULA

$$\large{ d_h = w }$$

Where:

$$\large{ d_h }$$ = hydraulic diameter

$$\large{ w }$$ = width of tube