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.

 

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

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