Written by Jerry Ratzlaff on . Posted in Geotechnical Engineering

tortuosity 1Tortuosity, abbreviated as \( \tau \) (Greek symbol tau), a dimensionless number, is the dispersion of fluid flow in porous media.  In a packed soil there is a decrease in a solutions rate of diffusion due to the presence of wandering paths within the pores of a packed soil.  The presence of such paths result in a slower rate of travel for the solution through the medium.


Tortuosity formula

\(\large{ \tau =  \frac{ l }{ C }  }\)   


 Units English Metric
\(\large{ \tau } \)  (Greek symbol tau) = tortuosity \(\large{dimensionless}\)
\(\large{ l } \) = length of the curve \(\large{in}\) \(\large{mm}\)
\(\large{ C } \) = distance between the ends of the curve \(\large{in}\) \(\large{mm}\)


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Tags: Soil Equations Geotechnical Equations