Contents - Index


THERMALDIFFUSIVITY

 

The THERMALDIFFUSIVITY function returns the thermal diffusivity for the specified fluid defined as

 

 alpha = k / (rho*Cp)

 

where

 k is the thermal conductivity

       rho is the density

 Cp is the specific heat

 

The units of thermal diffusivity are m^2/sec or ft^2/hr depending on whether EES is configured in SI units or English units.

 

Examples:

 

$Load Incompressible

$UnitSystem SI C kPa mass

alpha_1=thermaldiffusivity(Air,T=100 [C], P=100 [kPa])

alpha_2=thermaldiffusivity(Steam,T=100 [C],x=0)

alpha_3=thermaldiffusivity(Dowtherm_A,T=25 [C])

 

{Solution:

alpha_1=0.00003281 [m^2/s]

alpha_2=1.646E-07 [m^2/s]

alpha_3=8.234E-08 [m^2/s]

}

 

Thermophysical Property Functions