PROCESS ASSOCIATES
Grätz Number
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Grätz Number

Grätz number is proportional to { (thermal capacity) / (convective heat transfer) } and is used in heat transfer in general and convection in laminar flow calculations in particular. It is equivalent to {(L/d) / (Re.Pr)} or {(L/d) / Pe}. It is normally defined in one of the following forms :

 

Grätz Number

or

Grätz Number

or

Grätz Number

or

Grätz Number

 

Where:

alpha

=

Thermal diffusivity

Cp

=

Heat capacity

d

=

Diameter

G

=

Mass velocity

k

=

Thermal Conductivity

L

=

Length

m

=

Mass flowrate

rho

=

Density

V

=

Velocity

 

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