Hagen Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Hagen number, abbreviated Hg, is a dimensionless number that is used in forced flow calculations.  The equation is similar to the Grashof Number but for forced flow rather than natural convection.

 

Hagen number calculator

 

Hagen number formula

\(\large{ Hg = \frac { 1  } { \rho} \;  \frac { d p  } { d x} \;   \frac { l^3  } { \nu^2}  }\)   

Where:

\(\large{ Hg }\) = Hagen number

\(\large{ \rho }\)  (Greek symbol rho) = density

\(\large{ \nu }\)  (Greek symbol nu) = kinematic viscosity

\(\large{ l }\) = length

\(\large{ d p }\) = pressure differential

\(\large{ \frac { d p  } { d x}   }\) = pressure gradient

\(\large{  d x  }\) = distance between pressure centers

 

   

Tags: Equations for Flow Calculators