Hagen Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Hagen Number

Hagen number ( \(Hg\) ) (dimensionless number) is used in forced flow.

Hagen Number FORMULA

\( Hg = \frac { 1  } { \rho} \;  \frac { d p  } { d x} \;   \frac { l^3  } { \nu^2}  \)          \( Hagen \; number   \;=\;   \frac { 1  } { density } \;\;x\;\;  \frac { difference \; in \;pressure  } { difference \; in \; length  }  \;\;x\;\;   \frac { length^3  } { kinematic \; viscosity^2}  \)

Where:

\(Hg\) = Hagen number

\(l\) = length

\(\rho\) (Greek symbol rho) = density

\(\nu\) (Greek symbol nu) = kinematic viscosity

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

 

Tags: Equations for Flow