Thermal Diffusivity
Thermal diffusivity, abbreviated as \(\alpha\) (Greek symbol alpha), is a measure of the transient thermal reaction of a material to a change in temperature.
Thermal Diffusivity formulas
\(\large{ \alpha = \frac{ k }{ \rho \; Q } }\) | |
\(\large{ \alpha = \frac{ Fo \; l_c^2 }{ t } }\) | (Fourier number) |
\(\large{ \alpha = Le \; D_m }\) | (Lewis number) |
\(\large{ \alpha = \frac{ \nu }{ Pr } }\) | (Prandtl number) |
\(\large{ l_c = \frac{ We \; \sigma }{ \rho \; v^2 } }\) | (Weber number) |
Where:
\(\large{ \alpha }\) (Greek symbol alpha) = thermal diffusivity
\(\large{ l_c }\) = characteristic length
\(\large{ \rho }\) (Greek symbol rho) = density
\(\large{ Fo }\) = Fourier number
\(\large{ \nu }\) (Greek symbol nu) = kinematic viscosity
\(\large{ Le }\) = Lewis number
\(\large{ D_m }\) = mass diffusivity
\(\large{ Pr }\) = Prandtl number
\(\large{ Q }\) = specific heat capacity
\(\large{ \sigma }\) (Greek symbol sigma) = surface tension
\(\large{ k }\) = thermal conductivity
\(\large{ t }\) = time
\(\large{ v }\) = velocity
\(\large{ We }\) = Weber number