Hydraulic Diameter of Bounded Walls Conduits

We transport fluids through conduits that could have different shapes and come in different arrangements. Some conduits are circulars, others are rectangular, triangular or even annular.
When we carry out CFD - computational fluid dynamics simulations, it is important to use the right inlet and outlet boundary conditions. Moreover, it is essential to select the correct boundary conditions for turbulent flow.

At the inlet of any wall bounded conduit you should always think of the hydraulic diameter and the inlet turbulence intensity. I created this online application so that you can calculate it for a variety of conduit shapes. The general formula of DH is dependent on the wetter perimeter and the flow area. The equation below can be used as a general formula to calculate any conduit shape.

general equation

DH: Hydraulic Diameter

A: Flow area

P: Wetter Perimeter

Select The Appropriate Geometry

 D1, mm:
 D2, mm:

α, degrees:

 B, mm:
C, mm:
 B, mm:
 Diameter, mm:
Isosceles Triangle Duct
Annulus pipe
Rectangular Duct
Circular Pipe