Hydraulic Diameter

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Hydraulic diameter, abbreviated as \(d_h\), is normally used when the flow is in non-circular pipe or tubes and channels. Circular pipe has the same pressure drop of a rectangular channel but a greater average velocity. Square or rectangular pipes have a greater weight and a greater pressure drop compared with a circular pipe with the same section. For established shapes, various calculations are linked below.

\(\large{ d_h = \frac { 4 \;A } { P } }\)

Where:

\(\large{ d_h }\) = hydraulic diameter

\(\large{ A }\) = cross section area

\(\large{ P }\) = cross section wetting perimeter

Hydraulic Diameters for Specific Flow Profiles

Hydraulic Diameter of a Pipe

Hydraulic Diameter for pipe flow profile

Hydraulic Diameter of Annular Flow Profile

Hydraulic Diameter for annular flow profile

Hydraulic Diameter of an Ellipse

Hydraulic Diameter for ellipse

Hydraulic Diameter for Square Tube

Hydraulic Diameter for square tube

Hydraulic Diameter for Rectangular Tube

Hydraulic Diameter for rectangular tube

 

Hydraulic Diameter for Isosceles Triangle

Hydraulidc Diameter for isosceles triangle

Hydraulic Diameter of a Right Triangle

Hydraulic Diameter for right triangle

 

Tags: Equations for Hydraulic