# Hydraulic Diameter of an Isosceles Triangle

on . Posted in Fluid Dynamics

The hydraulic diameter, abbreviated dh, is used to calculate the Reynolds Number, friction factor or for calculating pressure drop across two points.  For most geometries, the hydraulic diameter, or characteristic length, is not equal to the diameter of the shape.  The calculation below is an example of the hydraulic diameter when the shape is an isoceles triangle flowing area.

## Hydraulic Diameter of an Isosceles Triangle formula

$$\large{ d_h = \frac { w\; sin \; \theta } { 1 \;+\; sin \frac {\theta}{2} } }$$
Symbol English Metric
$$\large{ d_h }$$ = hydraulic diameter $$\large{in}$$ $$\large{mm}$$
$$\large{ \theta }$$   (Greek symbol theta) = angle $$\large{deg}$$ $$\large{rad}$$
$$\large{ w }$$ = width of side $$\large{in}$$ $$\large{mm}$$

## Hydraulic Diameter of an Isosceles Triangle calculator

Tags: Hydraulic Equations