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PRANDTL

 

The PRANDTL function returns the dimensionless Prandtl number for the specified fluid defined as

 

Pr=mu * Cp / k

 

where

mu is the viscosity

Cp is the specific heat

k is the thermal conductivity

 

The Prandtl function requires temperature as an input for ideal gas and incompressible substances and temperature and pressure for real substances.

 

Examples:

 

$UnitSystem SI C kPa mass

Pr_1=Prandtl(Air,T=100 [C])

Pr_2=Prandtl(Steam,T=100 [C],P=50 [kPa])

Pr_3=Prandtl(Dowtherm_A,T=25 [C])

 

{Solution:

Pr_1=0.7118 

Pr_2=0.9876 

Pr_3=484.6 

}

 

Thermophysical Property Functions