The Hydraulic Diameter of an Annulus calculator computes the hydraulic diameter based on the inner and outer diameter of the annulus.
INSTRUCTIONS: Choose units and enter the following:
Hydraulic Diameter (hd): The diameter is returned in meters. However, this can be automatically converted to compatible units via the pull-down menu.
The formula for the hydraulic diameter of an annulus is:
hd = o - i
where: