# Viscosity of a Mixture

on . Posted in Fluid Dynamics

This calculates the effective viscosity of gasses.

## Viscosity of a Mixture formula

$$\large{ \mu = \frac {\sum \;\left({\mu_i \; y_i \; \sqrt{M_i}}\right)}{\sum\; \left({y_i \; \sqrt{M_i}}\right)} }$$
Symbol 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 $$\large{\frac{lbm}{lbmol}}$$ $$\large{\frac{kg}{kmol}}$$

Tags: Viscosity Equations