Diffusion Coefficient

Written by Jerry Ratzlaff on . Posted in Geotechnical Engineering

energy internal 2Diffusion coefficient, abbreviated as D, also called diffusivity, expresses the transfer rate of a substance by random molecular motion.


Diffusion Coefficient formula

\(\large{ D =  \frac{ 1 }{ \mu } \; \sigma  \; T_a  }\)   


 Units English Metric
\(\large{ D } \) = diffusion coefficient \(\large{\frac{ft^2}{sec}}\) \(\large{\frac{m^2}{s}}\)
\(\large{ T_a }\) = absolute temperature \(\large{F}\) \(\large{K}\)
\(\large{ \sigma }\)  (Greek symbol sigma) = Stefan-Boltzmann constant \(\large{constant}\)
\(\large{ \mu }\)  (Greek symbol mu) = friction coefficient \(\large{dimensionless}\)

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Tags: Coefficient Equations Soil Equations Diffusion Equations