Viscosity of a Mixture

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

This calculates the effective viscosity of gasses.

 

Viscosity of a Mixture formula

\(\large{ \mu = \frac {\sum \;\left({\mu_i \; y_i \; \sqrt{M_i}}\right)}{\sum\; \left({y_i \; \sqrt{M_i}}\right)}   }\)   

Where:

 Units English Metric
\(\large{ \mu }\)  (Greek symbol mu) = dynamic viscosity of the gas mixture \(\large{\frac{lbf-sec}{ft^2}}\) \(\large{Pa-s}\)
\(\large{ \mu_i }\)  (Greek symbol mu) = dynamic viscosity of gas component \(\large{\frac{lbf-sec}{ft^2}}\) \(\large{Pa-s}\)
\(\large{ y_i }\) = mole fraction or percent of gas component \(\large{dimensionless}\)
\(\large{ M_i }\) = molecular weight of gas component \(\large{\frac{lbm}{lbmol}}\) \(\large{\frac{kg}{kmol}}\)


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Tags: Viscosity Equations