Prandtl Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Prandtl Number

Prandtl number ( \(Pr\) ) (dimensionless number) is used to calculate force by the ratio of momentum diffusivity (kinematic viscosity) and thermal diffusivities. 

Prandtl Number FORMULA

\(\large{ Pr= \frac{\nu} {\alpha}  }\)         

Where:

\(\large{ Pr }\) = Prandtl number

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

\(\large{ \alpha }\)  (Greek symbol alpha) = thermal diffusivity

Solve for:

\(\large{ \nu =  Pr    \alpha  }\)

\(\large{ \alpha = \frac { \nu  }{  Pr  }    }\)

 

Tags: Equations for Force