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
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.
DH: Hydraulic Diameter
A: Flow area
P: Wetter Perimeter