Thermal diffusivity Totally Explained

Everything about Thermal Diffusivity totally explained

In heat transfer analysis, thermal diffusivity (symbol:

alpha,

, but note that the symbols

kappa

D

, and

k

are all commonly used) is the ratio of thermal conductivity to volumetric heat capacity. ť

alpha =

where:

$k,$ : thermal conductivity (SI units : W/(m K) )
$ho c_p,$ : volumetric heat capacity (SI units : J/(m³K) )
$ho,$ : density (SI units : kg/(m³) )
$c_p,$ : specific heat capacity (SI units : J/(kg K) )

The SI units for thermal diffusivity is m²/s.
Substances with high thermal diffusivity rapidly adjust their temperature to that of their surroundings, because they conduct heat quickly in comparison to their thermal 'bulk'.
For common rock material,

alpha,

~ 10^-6 m²/s.
Thermal diffusivity of air at 300 K is 0.000024 m²/s.
For a plot of thermal diffusivity of air as a function of absolute temperature see James Ierardi's Fire Protection Engineering Site

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Everything about Thermal Diffusivity totally explained

See also